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Five Largest Ancestry Groups
Click on a column header to re-sort the table| City | County | Group 1 | Group 2 | Group 3 | Group 4 | Group 5 |
|---|---|---|---|---|---|---|
| Abingdon | Knox County | German(23.1) | Irish(16.7) | Swedish(11.1) | American(9.3) | English(8.5) |
| Adair | McDonough County | Irish(46.2) | German(28.8) | Dutch(12.7) | English(6.6) | (n/a) |
| Addieville | Washington County | German(70.8) | Irish(11.8) | English(3.3) | American(1.8) | Polish(1.5) |
| Addison | DuPage County | Italian(13.4) | German(12.4) | Polish(12.4) | Irish(8.4) | Greek(2.5) |
| Adeline | Ogle County | English(20.4) | American(17.6) | Irish(17.6) | German(17.6) | Swedish(8.3) |
| Albany | Whiteside County | German(32.2) | Irish(13.7) | Dutch(10.6) | English(7.2) | American(6.6) |
| Albers | Clinton County | German(58.6) | American(8.4) | Irish(6.2) | English(5.6) | Danish(2.1) |
| Albion | Edwards County | German(23.6) | English(21.1) | American(11.6) | Irish(10.7) | Scottish(1.8) |
| Aledo | Mercer County | German(21.4) | Irish(19.2) | English(13.6) | Swedish(7.7) | American(4.3) |
| Alexander | Morgan County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Alexis | Warren County | Swedish(18.6) | German(18.1) | Irish(12.4) | English(10.5) | American(5.0) |
| Algonquin | McHenry County | German(28.3) | Polish(17.1) | Irish(14.6) | Italian(13.2) | English(6.8) |
| Alhambra | Madison County | German(54.8) | Irish(15.7) | English(8.6) | French(3.9) | Polish(3.5) |
| Allendale | Wabash County | American(16.6) | German(15.1) | Irish(7.3) | English(6.9) | Dutch(2.2) |
| Allenville | Moultrie County | American(36.2) | German(13.1) | Irish(9.2) | English(5.4) | Scotch-Irish(2.3) |
| Allerton | Vermilion County | American(32.1) | German(20.7) | Irish(19.0) | English(13.1) | Scottish(3.0) |
| Alma | Marion County | German(26.4) | Irish(13.0) | American(10.6) | English(5.8) | Scotch-Irish(2.4) |
| Alorton | Saint Clair County | African(2.1) | English(1.1) | American(0.6) | Other Subsaharan African(0.2) | (n/a) |
| Alpha | Henry County | German(28.8) | Swedish(25.9) | Irish(16.5) | English(12.6) | American(5.2) |
| Alsey | Scott County | American(43.0) | German(18.6) | English(7.6) | Irish(6.1) | Italian(3.2) |
| Alsip | Cook County | Irish(18.7) | Polish(16.0) | German(14.9) | Italian(6.2) | English(3.8) |
| Altamont | Effingham County | German(37.2) | American(20.1) | Irish(8.3) | English(7.9) | Danish(2.7) |
| Alto Pass | Union County | German(21.4) | Irish(12.1) | English(10.9) | Scottish(4.9) | Dutch(3.6) |
| Alton | Madison County | German(24.9) | Irish(12.3) | English(9.5) | American(4.8) | Italian(4.3) |
| Altona | Knox County | German(23.3) | Swedish(16.2) | English(11.9) | Irish(9.9) | American(8.4) |
| Alvan | Vermilion County | American(30.5) | German(5.3) | English(5.0) | Irish(5.0) | European(2.3) |
| Amboy | Lee County | German(35.4) | Irish(22.8) | American(11.7) | English(8.8) | Italian(6.8) |
| Anchor | McLean County | German(42.6) | Irish(19.4) | American(10.2) | English(8.3) | Italian(5.6) |
| Ancona | Livingston County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Andalusia | Rock Island County | German(42.0) | Irish(17.0) | Swedish(7.9) | English(7.6) | American(5.4) |
| Andover | Henry County | German(32.9) | Swedish(23.4) | Irish(18.7) | English(7.0) | Welsh(4.6) |
| Anna | Union County | German(27.1) | Irish(9.6) | American(9.2) | English(7.1) | Swedish(4.1) |
| Annapolis | Crawford County | American(32.9) | German(21.1) | Italian(19.7) | English(7.9) | Dutch(7.9) |
| Annawan | Henry County | German(30.7) | Belgian(21.1) | Irish(10.7) | Swedish(9.1) | English(8.0) |
| Antioch | Lake County | German(37.6) | Irish(20.8) | Polish(13.4) | Italian(8.1) | English(7.9) |
| Apple Canyon Lake | Jo Daviess County | German(44.7) | American(21.9) | Irish(16.3) | English(15.2) | Italian(7.4) |
| Apple River | Jo Daviess County | German(38.3) | Irish(22.8) | American(15.3) | English(12.8) | Norwegian(6.8) |
| Arcola | Douglas County | German(24.0) | Irish(15.4) | American(12.0) | English(10.1) | Scottish(2.3) |
| Arenzville | Cass County | German(40.4) | American(13.6) | English(12.7) | Irish(11.3) | Scottish(2.5) |
| Argenta | Macon County | American(30.0) | German(25.2) | Irish(11.0) | English(6.5) | French(4.0) |
| Arlington | Bureau County | German(26.3) | Irish(16.0) | Italian(16.0) | Norwegian(9.7) | English(6.9) |
| Arlington Heights | Cook County | German(26.7) | Irish(18.0) | Polish(16.0) | Italian(11.2) | English(6.1) |
| Armington | Tazewell County | German(29.2) | English(9.3) | American(8.5) | Scottish(7.4) | Irish(6.3) |
| Armstrong | Vermilion County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Aroma Park | Kankakee County | German(29.3) | French(15.6) | Irish(15.1) | English(11.0) | Dutch(9.4) |
| Arrowsmith | McLean County | German(22.3) | American(22.0) | Irish(15.9) | Norwegian(6.9) | English(5.4) |
| Arthur | Douglas County | German(30.1) | American(15.1) | English(11.1) | Irish(7.9) | Scotch-Irish(2.2) |
| Ashkum | Iroquois County | German(39.5) | Irish(22.2) | French(16.1) | American(12.9) | English(7.0) |
| Ashland | Cass County | American(29.3) | German(24.9) | Irish(14.7) | English(6.2) | Swedish(5.0) |
| Ashley | Washington County | German(32.7) | Polish(15.9) | Irish(14.9) | American(8.7) | English(5.4) |
| Ashmore | Coles County | German(20.9) | American(14.0) | Irish(8.4) | English(7.8) | Polish(3.4) |
| Ashton | Lee County | German(35.1) | Irish(17.9) | English(9.0) | American(7.1) | Swedish(5.2) |
| Assumption | Christian County | German(19.6) | American(13.8) | Irish(12.5) | English(8.0) | Dutch(2.8) |
| Astoria | Fulton County | German(21.6) | American(19.9) | English(11.4) | Dutch(9.6) | Irish(8.9) |
| Athens | Menard County | German(31.2) | American(15.8) | English(12.3) | Irish(11.8) | Italian(6.5) |
| Atkinson | Henry County | German(25.7) | Belgian(24.8) | Swedish(15.0) | English(6.0) | American(5.6) |
| Atlanta | Logan County | American(29.1) | German(24.1) | English(13.5) | Irish(9.6) | Dutch(3.6) |
| Atwood | Piatt County | German(29.7) | American(20.2) | Irish(11.3) | English(10.9) | Dutch(3.1) |
| Auburn | Sangamon County | German(26.1) | Irish(15.7) | American(9.3) | English(7.2) | French(6.6) |
| Augusta | Hancock County | German(22.9) | American(17.2) | English(15.2) | Irish(8.3) | Swedish(2.8) |
| Aurora | Kane County | German(14.8) | Irish(9.3) | Polish(4.9) | English(4.7) | Italian(4.5) |
| Ava | Jackson County | German(38.6) | Irish(19.2) | English(17.3) | French(7.7) | American(6.0) |
| Aviston | Clinton County | German(68.9) | American(7.4) | Irish(5.9) | English(4.9) | Italian(4.5) |
| Avon | Fulton County | German(29.1) | English(23.4) | Irish(12.9) | American(12.6) | Dutch(7.8) |
| Baileyville | Ogle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Baldwin | Randolph County | German(49.5) | Irish(13.8) | American(9.4) | Other Arab(7.2) | English(5.3) |
| Banner | Fulton County | German(39.0) | Irish(16.5) | English(16.5) | American(7.9) | Italian(4.3) |
| Bannockburn | Lake County | German(22.8) | Irish(11.3) | English(9.4) | Italian(7.0) | Polish(6.4) |
| Bardolph | McDonough County | German(20.8) | English(19.5) | Irish(15.5) | American(6.2) | French(2.7) |
| Barnhill | Wayne County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Barrington | Cook County | German(21.7) | Irish(21.0) | Italian(12.8) | English(12.6) | Polish(10.2) |
| Barrington Hills | Cook County | German(26.2) | Irish(19.9) | English(13.2) | Italian(12.5) | Polish(9.4) |
| Barry | Pike County | German(21.6) | American(16.0) | English(15.6) | Irish(10.6) | Italian(6.6) |
| Barstow | Rock Island County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Bartelso | Clinton County | German(82.9) | American(7.6) | Irish(5.2) | English(3.8) | French(1.2) |
| Bartlett | DuPage County | German(27.5) | Italian(17.4) | Irish(15.7) | Polish(15.7) | English(4.4) |
| Bartonville | Peoria County | German(35.1) | American(13.5) | Irish(12.7) | English(11.4) | Italian(3.6) |
| Basco | Hancock County | German(32.8) | American(32.8) | Irish(13.0) | English(6.1) | Swedish(4.6) |
| Batavia | Kane County | German(32.5) | Irish(18.4) | Polish(13.1) | English(11.6) | Italian(11.6) |
| Batchtown | Calhoun County | German(73.0) | Irish(13.1) | American(5.9) | Scotch-Irish(2.5) | English(2.5) |
| Bath | Mason County | American(24.6) | German(22.8) | Irish(13.0) | English(9.5) | French(3.2) |
| Bay View Gardens | Woodford County | American(19.7) | German(18.2) | Dutch(15.1) | French(10.5) | English(8.0) |
| Baylis | Pike County | American(25.6) | German(16.8) | French(8.0) | Irish(8.0) | English(7.2) |
| Beach Park | Lake County | German(21.5) | Irish(13.4) | English(7.5) | Polish(6.4) | Italian(4.1) |
| Beardstown | Cass County | American(16.5) | German(11.2) | Irish(7.9) | English(6.4) | Scottish(1.7) |
| Beason | Logan County | American(40.1) | German(8.8) | Welsh(2.2) | (n/a) | (n/a) |
| Beaverville | Iroquois County | German(24.0) | French(19.7) | Irish(17.8) | American(13.9) | French Canadian(7.7) |
| Beckemeyer | Clinton County | German(54.7) | Irish(18.6) | Polish(5.7) | English(4.6) | Swiss(3.5) |
| Bedford Park | Cook County | Irish(15.7) | Polish(14.6) | German(13.9) | Italian(9.1) | American(6.6) |
| Beecher | Will County | German(32.7) | Irish(27.8) | Italian(16.4) | Polish(14.2) | English(7.9) |
| Beecher City | Effingham County | German(18.9) | Irish(12.5) | American(12.0) | English(6.7) | Scottish(3.6) |
| Belgium | Vermilion County | American(31.0) | Irish(19.0) | German(13.7) | French(13.7) | English(4.2) |
| Belknap | Johnson County | English(21.9) | German(18.1) | American(14.3) | Scotch-Irish(7.6) | Irish(6.7) |
| Belle Prairie City | Hamilton County | German(65.2) | Irish(16.1) | American(9.8) | English(8.9) | Polish(0.9) |
| Belle Rive | Jefferson County | English(18.4) | German(17.7) | American(12.3) | Irish(11.4) | Italian(8.5) |
| Belleville | Saint Clair County | German(28.1) | Irish(10.9) | European(8.9) | English(6.9) | American(4.8) |
| Bellevue | Peoria County | German(32.0) | Irish(19.2) | English(9.8) | Italian(7.3) | American(6.9) |
| Bellflower | McLean County | American(34.9) | German(30.0) | English(14.7) | Irish(10.1) | Italian(7.3) |
| Bellmont | Wabash County | American(6.9) | Irish(5.2) | German(4.8) | English(2.6) | French(2.2) |
| Bellwood | Cook County | German(1.3) | African(1.1) | Italian(1.0) | Polish(0.6) | Irish(0.6) |
| Belvidere | Boone County | German(18.5) | Irish(13.0) | American(7.7) | English(7.1) | Swedish(5.7) |
| Bement | Piatt County | German(24.4) | American(22.6) | Irish(13.7) | English(7.6) | French(4.3) |
| Benld | Macoupin County | German(23.7) | Irish(17.1) | Italian(13.2) | French(11.0) | English(9.4) |
| Bensenville | DuPage County | German(11.7) | Polish(10.6) | Italian(8.4) | Irish(7.9) | English(3.0) |
| Benson | Woodford County | German(56.5) | Irish(17.0) | English(10.5) | American(7.4) | Italian(4.7) |
| Bentley | Hancock County | American(25.6) | European(20.5) | German(15.4) | Hungarian(12.8) | French(12.8) |
| Benton | Franklin County | German(24.8) | English(16.8) | Irish(13.4) | American(11.7) | Italian(6.5) |
| Berkeley | Cook County | Irish(11.0) | German(10.6) | Polish(8.6) | English(5.1) | Italian(5.0) |
| Berlin | Sangamon County | German(34.9) | Irish(13.4) | American(7.5) | Russian(4.3) | Welsh(3.2) |
| Berwick | Warren County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Berwyn | Cook County | Italian(8.1) | German(7.4) | Irish(7.2) | Polish(6.8) | Czech(3.4) |
| Bethalto | Madison County | German(34.1) | Irish(12.8) | English(12.6) | American(8.7) | Italian(7.6) |
| Bethany | Moultrie County | German(19.5) | American(10.2) | Irish(10.2) | English(8.3) | Scottish(3.1) |
| Big Rock | Kane County | German(39.5) | Irish(20.1) | English(9.2) | Swedish(7.2) | Italian(6.2) |
| Biggsville | Henderson County | German(20.7) | Irish(12.1) | American(9.2) | English(8.1) | Scottish(3.7) |
| Bingham | Fayette County | German(15.8) | Irish(14.0) | Dutch(6.1) | Polish(0.9) | English(0.9) |
| Bishop Hill | Henry County | Swedish(25.8) | German(15.6) | Italian(11.7) | Polish(9.4) | English(9.4) |
| Bismarck | Vermilion County | American(27.3) | German(21.0) | Irish(16.0) | English(7.8) | Scotch-Irish(2.8) |
| Blackstone | Livingston County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Blandinsville | McDonough County | Irish(21.3) | German(21.0) | American(13.8) | English(12.1) | Swedish(3.3) |
| Bloomingdale | DuPage County | Italian(24.0) | German(19.3) | Polish(15.6) | Irish(13.1) | English(4.5) |
| Bloomington | McLean County | German(26.8) | Irish(14.3) | English(10.2) | American(9.5) | Italian(3.4) |
| Blue Island | Cook County | German(8.3) | Polish(5.1) | Irish(5.1) | Italian(4.9) | English(1.5) |
| Blue Mound | Macon County | American(32.6) | German(24.0) | Irish(11.6) | English(8.4) | Italian(4.0) |
| Bluff Springs | Cass County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Bluffs | Scott County | American(43.2) | German(22.7) | Irish(14.5) | English(10.8) | Italian(2.1) |
| Bluford | Jefferson County | English(26.3) | German(22.1) | Irish(11.6) | American(10.2) | French(4.4) |
| Bolingbrook | Will County | German(14.3) | Irish(10.7) | Polish(8.4) | Italian(6.8) | English(3.3) |
| Bondville | Champaign County | American(42.1) | German(17.4) | Irish(13.1) | English(4.8) | European(4.0) |
| Bone Gap | Edwards County | German(12.9) | English(7.1) | American(2.9) | Dutch(2.4) | Scottish(1.0) |
| Bonfield | Kankakee County | German(53.4) | American(14.4) | Irish(12.3) | French(10.5) | English(6.5) |
| Bonnie | Jefferson County | German(31.0) | Irish(27.7) | American(15.4) | English(15.0) | French(6.3) |
| Boody | Macon County | American(51.1) | English(21.5) | Irish(16.0) | German(15.5) | Dutch(4.6) |
| Boulder Hill | Kendall County | German(28.2) | Irish(15.8) | English(9.7) | Polish(7.3) | American(5.3) |
| Bourbonnais | Kankakee County | German(28.8) | Irish(14.0) | French(9.5) | Polish(8.6) | English(8.4) |
| Bowen | Hancock County | German(33.6) | American(15.1) | English(12.1) | Irish(9.9) | Italian(4.5) |
| Braceville | Grundy County | German(33.4) | Irish(18.9) | Italian(13.7) | English(11.3) | Polish(11.2) |
| Bradford | Stark County | German(43.6) | American(14.8) | Irish(10.8) | English(6.2) | Polish(3.6) |
| Bradley | Kankakee County | German(27.5) | Irish(15.7) | French(13.6) | English(8.0) | Polish(7.8) |
| Braidwood | Will County | German(26.3) | Irish(23.7) | Polish(12.3) | Italian(11.1) | English(8.4) |
| Breese | Clinton County | German(62.2) | Irish(11.3) | American(7.8) | Italian(2.5) | English(2.1) |
| Bridgeport | Lawrence County | German(13.2) | American(13.2) | English(11.2) | Irish(8.6) | French(4.5) |
| Bridgeview | Cook County | Polish(25.2) | Irish(16.9) | German(13.9) | Italian(8.0) | Other Arab(4.6) |
| Brighton | Macoupin County | German(38.4) | Irish(15.3) | American(10.5) | English(10.1) | French(6.6) |
| Brimfield | Peoria County | German(35.4) | Irish(17.9) | English(11.6) | American(10.8) | Polish(7.3) |
| Bristol | Kendall County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Broadlands | Champaign County | American(31.6) | Irish(19.1) | German(18.4) | English(10.5) | European(3.6) |
| Broadview | Cook County | Jamaican(4.4) | German(3.4) | Polish(3.1) | English(2.5) | Irish(2.1) |
| Broadwell | Logan County | American(28.6) | German(28.6) | Dutch(8.6) | English(8.6) | Irish(4.3) |
| Brocton | Edgar County | German(20.1) | Irish(18.5) | American(14.5) | English(6.5) | Italian(4.4) |
| Brookfield | Cook County | German(27.0) | Irish(21.6) | Italian(15.9) | Polish(15.0) | Czech(7.5) |
| Brooklyn | Saint Clair County | African(3.4) | European(0.7) | English(0.4) | (n/a) | (n/a) |
| Brookport | Massac County | German(15.6) | English(10.4) | Irish(10.4) | American(8.9) | Italian(4.7) |
| Broughton | Hamilton County | Italian(26.9) | Irish(20.7) | Dutch(15.6) | German(11.6) | Scottish(9.9) |
| Browning | Schuyler County | German(28.2) | American(25.8) | Irish(22.7) | Scotch-Irish(6.7) | English(3.7) |
| Browns | Edwards County | American(24.1) | German(15.7) | English(14.8) | Irish(9.3) | Belgian(5.6) |
| Brownstown | Fayette County | German(18.1) | American(12.8) | Irish(10.5) | English(8.0) | French(4.3) |
| Brussels | Calhoun County | German(55.0) | Irish(16.6) | American(6.0) | French(4.0) | Welsh(2.6) |
| Bryant | Fulton County | German(26.3) | American(22.6) | Irish(14.0) | English(11.8) | Croatian(3.8) |
| Buckingham | Kankakee County | German(29.3) | Italian(19.6) | Irish(13.2) | French(12.0) | Polish(10.4) |
| Buckley | Iroquois County | German(50.3) | American(16.8) | Irish(5.9) | English(5.9) | Italian(3.6) |
| Buckner | Franklin County | Italian(28.1) | Irish(19.3) | German(17.6) | English(11.8) | American(7.3) |
| Buda | Bureau County | German(20.9) | Irish(14.8) | American(14.3) | English(11.4) | Swedish(4.6) |
| Buffalo | Sangamon County | German(31.4) | Irish(24.5) | English(23.5) | Dutch(8.7) | American(5.1) |
| Buffalo Grove | Lake County | Russian(14.4) | German(13.5) | Polish(10.1) | Irish(7.6) | American(6.9) |
| Bull Valley | McHenry County | German(37.7) | Polish(14.9) | Irish(14.9) | Italian(13.1) | English(11.3) |
| Bulpitt | Christian County | German(25.4) | American(13.3) | Irish(11.2) | Italian(7.7) | English(4.4) |
| Buncombe | Johnson County | Irish(10.3) | American(7.0) | English(6.1) | German(5.6) | Polish(4.7) |
| Bunker Hill | Macoupin County | German(42.0) | Irish(13.8) | English(13.3) | American(8.6) | Dutch(5.2) |
| Burbank | Cook County | Polish(30.5) | Irish(11.2) | German(10.9) | Italian(5.5) | Palestinian(3.2) |
| Bureau Junction | Bureau County | German(19.6) | Irish(16.9) | American(14.6) | Swedish(10.3) | English(10.0) |
| Burlington | Kane County | German(42.8) | Irish(27.6) | Polish(10.4) | American(6.2) | Dutch(5.1) |
| Burnham | Cook County | Polish(4.3) | German(2.5) | Irish(2.1) | Italian(1.6) | African(1.6) |
| Burnt Prairie | White County | German(25.4) | American(11.9) | Irish(10.4) | English(7.5) | Polish(6.0) |
| Burr Ridge | DuPage County | Irish(17.4) | German(16.7) | Italian(11.2) | Polish(10.3) | English(6.4) |
| Bush | Williamson County | Irish(27.4) | English(16.9) | American(11.3) | German(9.8) | Welsh(9.0) |
| Bushnell | McDonough County | American(23.7) | German(23.0) | Irish(14.3) | English(11.6) | Polish(2.8) |
| Butler | Montgomery County | German(14.5) | American(7.6) | Irish(6.9) | Slovak(5.3) | Dutch(5.3) |
| Byron | Ogle County | German(38.0) | Irish(20.3) | Italian(8.5) | English(8.4) | American(7.5) |
| Cabery | Ford County | German(40.4) | American(12.2) | French(12.2) | Irish(11.3) | Italian(8.0) |
| Cahokia | Saint Clair County | German(7.2) | European(6.9) | Irish(3.8) | English(2.9) | American(2.8) |
| Cairo | Alexander County | American(7.2) | German(5.4) | English(4.0) | Irish(3.6) | Italian(1.2) |
| Caledonia | Boone County | German(37.8) | Irish(19.3) | Swedish(14.2) | Italian(8.6) | Polish(6.9) |
| Calhoun | Richland County | German(26.3) | Irish(20.4) | American(14.4) | English(12.0) | Scottish(2.4) |
| Calumet City | Cook County | Polish(5.4) | German(2.3) | Irish(2.0) | Italian(2.0) | African(1.4) |
| Calumet Park | Cook County | German(2.2) | Russian(1.7) | Irish(1.5) | Haitian(1.0) | African(0.7) |
| Camargo | Douglas County | German(28.9) | Irish(17.7) | English(9.8) | American(9.0) | Dutch(5.4) |
| Cambria | Williamson County | Irish(24.0) | English(23.7) | German(19.0) | French(4.8) | Welsh(4.1) |
| Cambridge | Henry County | German(26.3) | Irish(18.5) | Swedish(15.8) | English(9.0) | Belgian(6.4) |
| Camden | Schuyler County | American(68.1) | German(9.0) | Irish(6.3) | English(4.9) | (n/a) |
| Cameron | Warren County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Camp Grove | Marshall County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Camp Point | Adams County | German(42.1) | Irish(10.8) | American(10.7) | English(7.2) | Scotch-Irish(2.7) |
| Campbell Hill | Jackson County | German(55.5) | Irish(11.4) | English(7.8) | American(6.8) | Polish(4.3) |
| Campton Hills | Kane County | German(27.0) | Irish(20.2) | Polish(15.8) | Italian(11.5) | English(8.4) |
| Campus | Livingston County | Irish(48.9) | German(39.1) | Dutch(15.8) | American(3.8) | Polish(3.8) |
| Canton | Fulton County | German(21.7) | American(15.5) | English(13.8) | Irish(10.8) | Italian(3.3) |
| Cantrall | Sangamon County | German(27.5) | Irish(21.1) | American(13.5) | English(8.2) | Dutch(7.6) |
| Capron | Boone County | German(33.4) | Irish(16.4) | Italian(8.2) | American(7.5) | Polish(7.4) |
| Carbon Cliff | Rock Island County | German(21.4) | Irish(15.0) | Belgian(7.2) | Swedish(6.5) | English(5.8) |
| Carbon Hill | Grundy County | German(25.5) | Irish(18.9) | Italian(12.8) | Polish(9.9) | English(6.4) |
| Carbondale | Jackson County | German(18.6) | Irish(9.5) | English(7.8) | Italian(3.6) | Polish(3.2) |
| Carlinville | Macoupin County | German(32.9) | English(19.5) | Irish(17.3) | American(11.9) | Scottish(3.8) |
| Carlock | McLean County | German(29.4) | American(15.6) | Irish(11.8) | English(5.5) | French(4.9) |
| Carlyle | Clinton County | German(52.9) | Irish(18.2) | English(8.8) | American(5.3) | Italian(2.1) |
| Carman | Henderson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Carmi | White County | German(20.1) | American(17.8) | English(12.2) | Irish(9.7) | Polish(2.0) |
| Carol Stream | DuPage County | German(23.0) | Irish(13.6) | Italian(13.4) | Polish(11.7) | English(5.9) |
| Carpentersville | Kane County | German(15.2) | Polish(6.8) | Irish(6.7) | Italian(6.2) | English(2.9) |
| Carrier Mills | Saline County | German(21.9) | Irish(18.6) | American(11.3) | English(8.5) | Dutch(4.5) |
| Carrollton | Greene County | German(37.5) | Irish(14.7) | English(11.1) | American(8.5) | French(5.4) |
| Carterville | Williamson County | German(23.5) | English(16.5) | Irish(12.7) | American(8.2) | Italian(7.3) |
| Carthage | Hancock County | German(31.7) | English(15.8) | American(15.2) | Irish(11.0) | Swedish(4.8) |
| Cary | McHenry County | German(34.9) | Irish(21.8) | Polish(14.4) | Italian(11.2) | English(7.3) |
| Casey | Clark County | English(21.3) | German(14.7) | Irish(13.9) | American(8.3) | Slovak(2.3) |
| Caseyville | Saint Clair County | German(24.8) | Irish(14.3) | English(7.7) | American(4.8) | European(4.3) |
| Castleton | Stark County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Catlin | Vermilion County | German(20.1) | American(19.7) | English(16.5) | Irish(10.9) | French(3.5) |
| Cave-In-Rock | Hardin County | German(27.1) | Irish(23.5) | American(18.7) | English(12.7) | Scotch-Irish(4.8) |
| Cedar Point | LaSalle County | German(23.1) | Italian(20.4) | Irish(14.5) | Polish(12.5) | American(11.0) |
| Cedarville | Stephenson County | German(64.0) | Irish(24.3) | American(10.6) | English(6.9) | Norwegian(3.7) |
| Central City | Marion County | German(28.6) | Irish(19.7) | English(15.1) | American(8.5) | French(3.9) |
| Centralia | Marion County | German(25.1) | Irish(17.0) | English(12.0) | American(9.9) | Polish(2.9) |
| Centreville | Saint Clair County | African(1.5) | Irish(0.5) | American(0.4) | English(0.3) | Nigerian(0.2) |
| Cerro Gordo | Piatt County | German(27.1) | American(25.8) | Irish(12.3) | English(11.7) | Scottish(2.3) |
| Chadwick | Carroll County | German(43.3) | Irish(12.4) | American(10.3) | English(7.1) | Italian(5.3) |
| Chambersburg | Pike County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Champaign | Champaign County | German(19.0) | Irish(11.4) | American(11.3) | English(7.6) | Italian(4.1) |
| Chana | Ogle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Chandlerville | Cass County | American(40.6) | German(21.5) | Irish(9.7) | English(8.2) | French(1.5) |
| Channahon | Will County | German(30.4) | Irish(26.6) | Italian(16.4) | Polish(15.6) | English(10.0) |
| Channel Lake | Lake County | German(34.7) | Irish(20.2) | Polish(13.2) | English(12.0) | Czech(6.8) |
| Chapin | Morgan County | German(31.3) | American(27.4) | English(16.6) | Irish(10.6) | Dutch(3.8) |
| Charleston | Coles County | German(23.7) | Irish(16.3) | American(10.3) | English(7.8) | Italian(4.3) |
| Chatham | Sangamon County | German(33.6) | Irish(14.8) | English(10.9) | Italian(8.0) | American(6.8) |
| Chatsworth | Livingston County | German(32.9) | Irish(13.9) | American(11.1) | Italian(6.8) | English(6.3) |
| Chebanse | Iroquois County | German(37.0) | French(21.1) | Irish(18.5) | Polish(13.7) | American(12.9) |
| Chemung | McHenry County | Norwegian(43.7) | German(38.0) | Swedish(24.4) | Irish(17.8) | Danish(16.9) |
| Chenoa | McLean County | German(35.8) | Irish(16.8) | American(13.7) | English(10.1) | Dutch(4.1) |
| Cherry | Bureau County | German(27.4) | Polish(22.1) | Irish(15.0) | American(9.7) | English(9.4) |
| Cherry Valley | Winnebago County | German(22.9) | American(17.0) | Swedish(12.7) | Irish(11.8) | English(10.1) |
| Chester | Randolph County | German(24.2) | English(8.6) | Irish(5.4) | American(4.9) | French(4.3) |
| Chesterfield | Macoupin County | German(30.4) | Irish(22.6) | English(11.9) | American(10.1) | Dutch(9.5) |
| Chestnut | Logan County | German(18.1) | American(7.7) | English(3.9) | (n/a) | (n/a) |
| Chicago | Cook County | German(7.6) | Irish(7.6) | Polish(6.2) | Italian(3.9) | English(2.3) |
| Chicago Heights | Cook County | Italian(8.4) | German(6.9) | Polish(4.3) | Irish(4.3) | American(1.8) |
| Chicago Ridge | Cook County | Irish(24.5) | Polish(19.2) | German(14.2) | Italian(8.4) | Palestinian(3.6) |
| Chillicothe | Peoria County | German(39.4) | Irish(22.5) | English(13.8) | American(8.2) | French(4.8) |
| Chrisman | Edgar County | German(24.6) | Irish(14.6) | English(13.9) | American(9.7) | French(6.3) |
| Christopher | Franklin County | German(18.7) | English(15.6) | American(14.7) | Irish(13.8) | Italian(8.0) |
| Cicero | Cook County | Polish(2.4) | Irish(2.4) | German(2.3) | Italian(2.0) | Czech(0.9) |
| Cisco | Piatt County | American(36.4) | English(19.1) | Irish(13.8) | German(11.7) | Norwegian(3.9) |
| Cisne | Wayne County | German(10.8) | American(6.1) | Irish(3.4) | English(3.4) | Polish(2.5) |
| Cissna Park | Iroquois County | German(60.2) | American(15.9) | Irish(12.5) | Swedish(6.3) | English(5.1) |
| Clare | De Kalb County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Claremont | Richland County | German(21.3) | English(10.4) | American(8.9) | Irish(6.9) | Dutch(5.9) |
| Clarendon Hills | DuPage County | German(21.2) | Irish(18.5) | Italian(12.5) | Polish(8.3) | English(6.0) |
| Clay City | Clay County | German(19.9) | American(12.6) | English(9.4) | Irish(9.2) | Dutch(1.3) |
| Clayton | Adams County | German(29.0) | Irish(14.6) | American(14.3) | Swedish(7.9) | English(7.2) |
| Claytonville | Iroquois County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Clear Lake | Sangamon County | German(19.8) | Irish(13.7) | American(11.7) | Polish(2.8) | Scotch-Irish(2.4) |
| Cleveland | Henry County | German(21.2) | Swedish(12.8) | Belgian(9.9) | Irish(8.9) | English(7.9) |
| Clifton | Iroquois County | German(33.5) | Irish(22.6) | American(17.5) | French(13.0) | English(8.1) |
| Clinton | De Witt County | American(25.8) | German(18.5) | English(14.8) | Irish(13.0) | Dutch(2.8) |
| Coal City | Grundy County | German(26.1) | Irish(23.0) | Italian(16.7) | English(10.3) | Polish(9.2) |
| Coal Valley | Rock Island County | German(26.2) | Irish(20.0) | English(10.0) | Swedish(8.4) | Italian(5.7) |
| Coalton | Montgomery County | German(29.7) | Irish(12.3) | English(10.5) | American(7.2) | Polish(6.2) |
| Coatsburg | Adams County | German(37.5) | Irish(20.8) | American(6.9) | English(4.9) | Italian(2.8) |
| Cobden | Union County | German(14.6) | Irish(11.7) | English(6.3) | American(5.0) | French(3.6) |
| Coello | Franklin County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Coffeen | Montgomery County | German(20.2) | Irish(12.8) | English(9.6) | American(6.7) | Dutch(2.8) |
| Colchester | McDonough County | German(22.7) | Irish(19.0) | English(12.6) | American(6.0) | Swedish(3.6) |
| Coleta | Whiteside County | German(34.8) | Irish(17.9) | American(3.3) | Scotch-Irish(1.6) | Italian(1.6) |
| Colfax | McLean County | German(43.2) | Irish(15.1) | American(12.6) | English(12.5) | Swedish(3.2) |
| Collinsville | Madison County | German(27.1) | Irish(13.2) | English(9.9) | Italian(8.6) | American(5.2) |
| Collison | Vermilion County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Colona | Henry County | German(24.4) | Irish(17.0) | American(8.6) | English(5.8) | Norwegian(4.0) |
| Colp | Williamson County | Irish(15.3) | American(13.6) | German(13.6) | English(8.5) | Italian(8.1) |
| Columbia | Monroe County | German(49.5) | Irish(18.3) | English(12.4) | American(7.1) | Italian(5.8) |
| Columbus | Adams County | German(15.7) | Irish(6.5) | Scottish(6.5) | American(6.5) | Scotch-Irish(3.7) |
| Como | Whiteside County | German(25.2) | Irish(22.8) | American(17.5) | English(8.9) | Portuguese(2.1) |
| Compton | Lee County | German(24.7) | Irish(23.4) | American(9.1) | Norwegian(5.6) | English(5.3) |
| Concord | Morgan County | German(33.5) | English(23.9) | American(16.8) | Irish(14.8) | Polish(7.7) |
| Congerville | Woodford County | German(61.6) | Swiss(20.3) | American(9.8) | Irish(8.7) | English(5.8) |
| Cooksville | McLean County | German(63.3) | Irish(20.9) | English(15.8) | French(7.0) | Czech(5.7) |
| Cordova | Rock Island County | German(28.6) | Irish(17.6) | English(12.4) | Swedish(6.4) | Belgian(5.4) |
| Cornell | Livingston County | German(36.4) | Irish(17.9) | American(16.7) | English(12.0) | Finnish(5.7) |
| Cornland | Logan County | American(27.6) | Irish(12.1) | German(12.1) | (n/a) | (n/a) |
| Cortland | DeKalb County | German(46.6) | Irish(21.4) | Polish(10.1) | Italian(8.6) | Swedish(6.7) |
| Cottage Hills | Madison County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Coulterville | Randolph County | German(34.1) | Irish(13.9) | English(10.2) | Polish(7.1) | French(5.2) |
| Country Club Hills | Cook County | German(3.0) | Swedish(1.5) | Nigerian(1.5) | English(1.4) | Polish(1.1) |
| Countryside | Cook County | Irish(20.5) | German(19.1) | Polish(13.0) | Italian(10.3) | Czech(6.1) |
| Cowden | Shelby County | German(16.1) | Irish(8.6) | English(2.5) | American(2.3) | Dutch(2.2) |
| Coyne Center | Rock Island County | American(19.7) | German(18.5) | English(14.5) | Irish(13.8) | Belgian(6.0) |
| Crab Orchard | Williamson County | American(21.6) | English(18.5) | Irish(15.8) | German(11.6) | Italian(6.8) |
| Crainville | Williamson County | German(20.5) | English(16.5) | Irish(15.0) | Dutch(5.9) | Italian(5.1) |
| Creal Springs | Williamson County | German(23.6) | English(14.9) | Italian(12.4) | Irish(9.1) | American(5.1) |
| Crescent City | Iroquois County | German(52.3) | Irish(17.0) | American(13.4) | English(8.8) | French(6.0) |
| Crest Hill | Will County | German(19.8) | Polish(14.2) | Irish(12.2) | Italian(11.5) | English(4.7) |
| Creston | Ogle County | German(35.4) | Irish(25.2) | English(19.1) | Norwegian(13.4) | American(10.2) |
| Crestwood | Cook County | Irish(23.6) | German(17.7) | Polish(17.5) | Italian(11.8) | Lithuanian(3.8) |
| Crete | Will County | German(26.5) | Irish(13.0) | Polish(10.7) | English(9.7) | Italian(9.7) |
| Creve Coeur | Tazewell County | German(33.7) | Irish(17.6) | American(14.4) | English(11.5) | Italian(6.7) |
| Cropsey | McLean County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Crossville | White County | German(23.4) | Irish(19.2) | American(12.5) | French(7.7) | English(7.6) |
| Crystal Lake | McHenry County | German(29.9) | Irish(19.0) | Polish(14.4) | Italian(11.9) | English(7.5) |
| Crystal Lawns | Will County | Irish(33.8) | German(33.4) | Polish(16.4) | Italian(15.6) | American(6.7) |
| Cuba | Fulton County | American(22.1) | German(18.5) | Irish(13.2) | English(9.7) | Italian(4.4) |
| Cullom | Livingston County | German(34.6) | American(19.1) | English(14.7) | Irish(7.4) | Polish(5.0) |
| Curran | Sangamon County | German(47.1) | Irish(25.7) | French(11.5) | American(8.9) | English(5.8) |
| Cutler | Perry County | German(33.7) | Irish(15.9) | Italian(9.1) | English(5.6) | American(5.2) |
| Cypress | Johnson County | Irish(18.5) | German(18.2) | Dutch(8.8) | French(8.5) | Polish(6.6) |
| Dahinda | Knox County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Dahlgren | Hamilton County | German(33.6) | Irish(32.0) | English(10.8) | Dutch(6.9) | Polish(6.9) |
| Dakota | Stephenson County | German(47.4) | English(19.1) | Irish(11.3) | Dutch(8.5) | Italian(6.0) |
| Dale | Hamilton County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Dallas City | Hancock County | German(42.0) | Irish(16.4) | American(6.8) | Swedish(5.9) | English(5.8) |
| Dalton City | Moultrie County | German(22.6) | American(17.0) | English(12.6) | Irish(11.5) | Swiss(5.2) |
| Dalzell | Bureau County | Italian(27.1) | German(25.4) | Polish(17.4) | Irish(11.7) | American(8.9) |
| Damiansville | Clinton County | German(54.8) | French(9.7) | American(9.7) | Irish(4.8) | English(4.8) |
| Dana | LaSalle County | German(41.1) | English(22.7) | Norwegian(22.2) | Polish(11.6) | Irish(8.2) |
| Danforth | Iroquois County | German(32.4) | Irish(10.8) | French(10.5) | American(8.2) | Italian(5.3) |
| Danvers | McLean County | German(44.0) | Irish(19.1) | American(6.6) | English(6.4) | Polish(4.9) |
| Danville | Vermilion County | American(20.7) | German(13.4) | Irish(7.4) | English(5.6) | French(1.7) |
| Darien | DuPage County | German(21.4) | Polish(17.1) | Irish(15.0) | Italian(14.5) | Czech(5.1) |
| Davis | Stephenson County | German(45.4) | English(13.7) | Norwegian(12.3) | American(10.2) | Irish(9.3) |
| Davis Junction | Ogle County | German(34.4) | Irish(12.8) | Swedish(9.4) | English(8.4) | Polish(4.4) |
| Dawson | Sangamon County | German(24.7) | Irish(18.2) | English(14.8) | Italian(6.9) | Scottish(6.0) |
| Dayton | LaSalle County | German(42.7) | Irish(28.1) | American(10.9) | Italian(10.2) | Polish(8.3) |
| De Land | Piatt County | American(36.8) | German(26.0) | English(9.4) | Irish(9.3) | Belgian(4.3) |
| De Pue | Bureau County | German(10.9) | Irish(5.7) | English(4.5) | Italian(4.3) | Polish(4.0) |
| De Soto | Jackson County | German(25.0) | Irish(17.9) | English(13.5) | French(6.2) | American(6.1) |
| De Witt | De Witt County | American(37.0) | German(20.1) | Scottish(8.7) | Dutch(6.5) | English(6.0) |
| Decatur | Macon County | German(19.2) | American(16.3) | Irish(11.9) | English(9.3) | Polish(2.1) |
| Deer Creek | Tazewell County | German(36.2) | Irish(17.0) | English(17.0) | American(10.6) | Polish(6.0) |
| Deer Grove | Whiteside County | German(48.1) | Irish(43.2) | Dutch(22.2) | Polish(7.4) | French(7.4) |
| Deer Park | Lake County | German(29.8) | Polish(17.5) | Italian(13.3) | Irish(13.0) | English(6.7) |
| Deerfield | Lake County | Russian(17.4) | German(15.9) | Polish(12.1) | American(9.8) | Irish(7.4) |
| DeKalb | DeKalb County | German(23.5) | Irish(14.4) | English(7.2) | Polish(7.2) | Italian(6.3) |
| Delavan | Tazewell County | German(39.9) | Irish(16.3) | American(13.1) | English(8.5) | Italian(4.1) |
| Dennison | Clark County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Des Plaines | Cook County | German(19.9) | Polish(15.1) | Irish(13.7) | Italian(9.1) | English(3.8) |
| Detroit | Pike County | German(32.8) | American(20.8) | Irish(9.6) | French(3.2) | Canadian(2.4) |
| Dewey | Champaign County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Diamond | Grundy County | German(36.6) | Irish(23.0) | Italian(14.8) | English(9.0) | French(5.3) |
| Dieterich | Effingham County | German(46.5) | American(17.6) | Irish(14.1) | English(8.0) | French(5.6) |
| Divernon | Sangamon County | German(26.6) | Irish(19.6) | English(13.4) | American(8.0) | Dutch(5.8) |
| Dix | Jefferson County | German(15.5) | American(14.5) | Irish(12.6) | English(11.3) | French(4.4) |
| Dixmoor | Cook County | German(4.6) | Polish(3.5) | Italian(2.2) | African(1.7) | French(1.1) |
| Dixon | Lee County | German(30.4) | Irish(18.7) | English(8.6) | American(6.8) | Dutch(5.2) |
| Dolton | Cook County | German(1.6) | Polish(1.1) | American(1.1) | Irish(1.0) | Nigerian(1.0) |
| Dongola | Union County | Irish(19.8) | German(16.3) | Dutch(8.4) | American(5.8) | Polish(4.9) |
| Donnellson | Montgomery County | English(14.1) | German(11.0) | Irish(8.8) | Scotch-Irish(2.6) | French(1.8) |
| Donovan | Iroquois County | German(26.5) | American(20.0) | French(16.9) | Irish(16.9) | Italian(6.2) |
| Dorchester | Macoupin County | German(50.0) | English(24.7) | Scottish(6.2) | Irish(6.2) | Scotch-Irish(4.8) |
| Dorsey | Madison County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Dover | Bureau County | German(40.9) | Irish(29.5) | English(22.7) | Swedish(5.3) | Scottish(5.3) |
| Dow | Jersey County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Dowell | Jackson County | English(33.8) | German(27.0) | Irish(21.5) | Dutch(12.6) | Hungarian(8.2) |
| Downers Grove | DuPage County | German(26.5) | Irish(20.7) | Italian(13.9) | Polish(13.7) | English(8.2) |
| Downs | McLean County | German(33.7) | American(15.4) | Irish(15.2) | English(10.9) | Swedish(4.8) |
| Du Bois | Washington County | Polish(65.1) | German(42.3) | Irish(4.2) | American(3.2) | French Canadian(2.1) |
| Du Quoin | Perry County | German(27.7) | Irish(14.8) | American(10.5) | English(8.7) | Italian(5.2) |
| Dundas | Richland County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Dundee | Kane County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Dunfermline | Fulton County | American(27.1) | German(11.8) | English(11.3) | Irish(9.0) | Polish(5.4) |
| Dunlap | Peoria County | German(34.6) | Irish(20.7) | English(15.8) | American(8.8) | Swedish(5.4) |
| Dupo | Saint Clair County | German(28.8) | Irish(17.5) | English(10.1) | European(7.7) | American(7.7) |
| Durand | Winnebago County | German(38.7) | Irish(12.0) | American(10.3) | Italian(6.9) | English(6.6) |
| Dwight | Livingston County | German(36.0) | Irish(19.5) | English(14.1) | American(10.7) | Italian(10.1) |
| Eagarville | Macoupin County | German(29.2) | French(13.8) | English(9.2) | Dutch(7.7) | Italian(6.2) |
| Earlville | LaSalle County | German(31.7) | Irish(19.1) | English(13.2) | Norwegian(9.0) | Polish(6.5) |
| East Alton | Madison County | German(35.2) | Irish(16.6) | American(11.0) | English(7.8) | Italian(5.9) |
| East Brooklyn | Grundy County | German(40.2) | Polish(29.3) | Italian(27.2) | Irish(13.0) | Danish(7.6) |
| East Cape Girardeau | Alexander County | German(26.3) | Irish(13.5) | English(9.7) | American(7.5) | Jamaican(2.5) |
| East Carondelet | Saint Clair County | European(28.1) | German(10.1) | Irish(8.0) | Swedish(4.1) | Italian(2.5) |
| East Dubuque | Jo Daviess County | German(43.7) | Irish(27.4) | American(10.8) | French(5.3) | Dutch(3.3) |
| East Dundee | Kane County | German(32.3) | Irish(21.4) | English(10.3) | Polish(8.2) | American(8.2) |
| East Galesburg | Knox County | German(26.5) | Swedish(16.0) | Irish(14.9) | English(13.9) | American(9.8) |
| East Gillespie | Macoupin County | German(31.4) | Scottish(21.1) | Italian(19.6) | English(15.7) | Irish(8.3) |
| East Hazel Crest | Cook County | German(9.9) | Polish(8.2) | Irish(6.9) | Italian(3.6) | English(1.5) |
| East Lynn | Vermilion County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| East Moline | Rock Island County | German(19.1) | Irish(11.2) | Swedish(5.7) | English(5.5) | American(3.2) |
| East Peoria | Tazewell County | German(34.4) | Irish(13.8) | American(13.1) | English(10.5) | Italian(3.5) |
| East Saint Louis | Saint Clair County | African(1.1) | American(0.8) | German(0.5) | Irish(0.4) | English(0.2) |
| Easton | Mason County | German(34.0) | American(16.6) | English(12.9) | Irish(5.6) | French(3.7) |
| Eddyville | Pope County | German(34.6) | Irish(24.0) | English(20.2) | French Canadian(20.2) | Dutch(10.6) |
| Edelstein | Peoria County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Edgewood | Effingham County | German(18.3) | English(8.7) | Irish(7.2) | American(6.4) | Italian(2.3) |
| Edinburg | Christian County | German(20.5) | English(18.1) | Irish(9.4) | American(7.7) | Scottish(3.6) |
| Edwards | Peoria County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Edwardsville | Madison County | German(34.8) | Irish(13.4) | English(12.2) | Italian(6.4) | American(6.1) |
| Effingham | Effingham County | German(40.4) | Irish(12.7) | English(9.6) | American(7.3) | Scotch-Irish(2.4) |
| El Dara | Pike County | Irish(44.9) | English(6.0) | German(1.8) | French(1.8) | American(1.8) |
| El Paso | Woodford County | German(40.7) | English(15.9) | Irish(14.1) | American(7.3) | Italian(2.4) |
| Elburn | Kane County | German(50.1) | Irish(27.9) | Polish(10.0) | Italian(9.9) | English(7.4) |
| Eldena | Lee County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Eldorado | Saline County | Irish(20.7) | American(13.5) | German(13.4) | English(8.1) | Dutch(2.7) |
| Eldred | Greene County | German(34.2) | English(23.2) | Scottish(13.5) | Dutch(7.7) | American(4.5) |
| Eleroy | Stephenson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Elgin | Kane County | German(17.0) | Irish(7.8) | English(5.4) | Polish(5.4) | Italian(5.3) |
| Elizabeth | Jo Daviess County | German(41.9) | Irish(22.0) | American(10.3) | English(7.0) | French(4.3) |
| Elizabethtown | Hardin County | Irish(27.9) | German(23.9) | English(12.6) | Welsh(5.1) | American(4.8) |
| Elk Grove Village | Cook County | German(25.1) | Polish(20.1) | Irish(18.2) | Italian(12.4) | English(5.6) |
| Elkhart | Logan County | American(25.4) | German(19.9) | Irish(13.1) | English(10.0) | Swedish(3.1) |
| Elkville | Jackson County | German(29.7) | English(16.8) | Irish(8.3) | Scottish(5.7) | American(5.0) |
| Ellery | Edwards County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Elliott | Ford County | German(26.7) | American(26.0) | Italian(10.1) | English(6.5) | Irish(5.8) |
| Ellis Grove | Randolph County | German(45.5) | American(16.0) | Italian(7.5) | English(6.5) | Irish(6.3) |
| Ellisville | Fulton County | Irish(24.4) | German(21.0) | American(20.2) | Croatian(5.9) | Swedish(5.0) |
| Ellsworth | McLean County | German(41.2) | Irish(21.9) | American(14.9) | English(5.7) | Polish(5.3) |
| Elmhurst | DuPage County | German(27.8) | Irish(25.7) | Italian(16.2) | Polish(10.7) | English(6.0) |
| Elmwood | Peoria County | German(33.5) | Irish(14.7) | English(13.7) | American(10.5) | Polish(7.9) |
| Elmwood Park | Cook County | Polish(24.5) | Italian(19.7) | German(12.6) | Irish(11.5) | Ukrainian(3.1) |
| Elsah | Jersey County | German(41.3) | Irish(19.9) | English(15.1) | Scottish(7.4) | French(7.1) |
| Elvaston | Hancock County | German(33.6) | Irish(25.4) | English(15.6) | American(8.2) | French(4.9) |
| Elwin | Macon County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Elwood | Will County | Irish(29.4) | German(28.1) | Italian(17.3) | Polish(13.6) | English(7.4) |
| Emden | Logan County | German(55.7) | American(14.4) | English(12.2) | Irish(8.9) | Italian(2.4) |
| Emington | Livingston County | German(37.5) | Italian(21.7) | Polish(18.3) | Irish(13.3) | American(6.7) |
| Energy | Williamson County | Irish(14.7) | English(13.8) | German(13.2) | Italian(10.6) | American(4.5) |
| Enfield | White County | German(26.1) | Irish(22.4) | English(18.9) | American(11.0) | Danish(1.9) |
| Eola | Du Page County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Equality | Gallatin County | German(23.2) | Irish(21.9) | English(13.8) | American(12.8) | French(6.3) |
| Erie | Whiteside County | German(25.4) | Irish(16.1) | English(11.8) | American(7.9) | Swedish(7.6) |
| Esmond | De Kalb County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Essex | Kankakee County | German(40.8) | Irish(22.3) | Polish(13.9) | Italian(12.7) | English(6.2) |
| Eureka | Woodford County | German(46.6) | Irish(18.8) | English(9.4) | American(5.6) | Swiss(5.4) |
| Evanston | Cook County | German(16.1) | Irish(12.6) | English(7.9) | Polish(6.3) | Italian(4.7) |
| Evansville | Randolph County | German(43.8) | French(14.8) | Irish(11.8) | Italian(9.1) | American(5.8) |
| Evergreen Park | Cook County | Irish(29.4) | German(18.2) | Italian(9.9) | Polish(9.2) | English(5.6) |
| Ewing | Franklin County | German(22.0) | American(12.8) | Italian(12.1) | English(11.4) | Irish(10.3) |
| Exeter | Scott County | American(45.2) | German(24.2) | English(21.8) | Irish(18.5) | French(5.6) |
| Fairbury | Livingston County | German(44.4) | Irish(18.6) | English(12.1) | American(10.2) | Swiss(7.0) |
| Fairfield | Wayne County | American(14.5) | German(14.1) | English(12.4) | Irish(8.8) | Scotch-Irish(2.3) |
| Fairmont | Will County | Polish(10.2) | Irish(8.3) | German(8.0) | Italian(3.6) | English(2.3) |
| Fairmont City | Saint Clair County | European(6.8) | Irish(6.2) | German(6.1) | Polish(2.0) | French(1.8) |
| Fairmount | Vermilion County | American(37.9) | English(14.0) | German(12.6) | Irish(5.2) | Dutch(3.2) |
| Fairview | Fulton County | German(41.6) | Irish(15.4) | American(12.4) | English(12.0) | Dutch(4.5) |
| Fairview Heights | Saint Clair County | German(25.1) | Irish(13.6) | English(9.0) | American(6.4) | Italian(4.1) |
| Farina | Fayette County | American(27.9) | German(18.8) | Irish(10.9) | English(8.9) | Welsh(1.8) |
| Farmer City | De Witt County | German(25.0) | American(24.0) | English(19.1) | Irish(16.7) | Lithuanian(2.7) |
| Farmersville | Montgomery County | German(21.0) | American(10.3) | Irish(9.6) | English(7.7) | Dutch(2.4) |
| Farmington | Fulton County | German(29.0) | American(17.2) | English(12.6) | Irish(9.3) | Italian(7.5) |
| Fayetteville | Saint Clair County | German(59.9) | Irish(14.4) | French(5.3) | Russian(5.0) | Polish(3.4) |
| Fenton | Whiteside County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Ferris | Hancock County | German(21.8) | Irish(14.9) | American(12.4) | Greek(7.9) | Norwegian(6.4) |
| Fiatt | Fulton County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Fidelity | Jersey County | German(28.3) | English(16.6) | Irish(8.3) | American(2.8) | French(1.4) |
| Fieldon | Jersey County | German(44.7) | Irish(21.4) | French(10.5) | English(9.8) | American(9.4) |
| Fillmore | Montgomery County | American(11.4) | German(8.6) | English(3.5) | Irish(3.0) | Italian(2.3) |
| Findlay | Shelby County | German(16.7) | American(12.4) | English(7.7) | Irish(6.9) | French(2.2) |
| Fisher | Champaign County | German(32.8) | American(17.9) | English(11.6) | Irish(11.5) | Dutch(4.7) |
| Fithian | Vermilion County | American(32.2) | German(28.2) | Irish(17.3) | Italian(5.7) | English(4.2) |
| Flanagan | Livingston County | German(44.1) | Irish(16.2) | English(13.0) | American(12.9) | Dutch(5.0) |
| Flat Rock | Crawford County | German(25.2) | Irish(11.8) | English(9.2) | American(8.2) | Dutch(5.4) |
| Flora | Clay County | German(19.0) | American(15.1) | Irish(13.9) | English(9.5) | British(2.6) |
| Florence | Pike County | Italian(17.9) | Polish(17.9) | American(17.9) | Irish(17.9) | Lithuanian(10.7) |
| Flossmoor | Cook County | Irish(12.5) | German(12.2) | Polish(7.6) | Russian(5.4) | English(4.8) |
| Foosland | Champaign County | German(23.8) | American(12.6) | English(11.2) | Polish(9.1) | Irish(8.4) |
| Ford Heights | Cook County | German(1.4) | English(1.0) | Irish(0.9) | Jamaican(0.7) | Nigerian(0.6) |
| Forest City | Mason County | German(49.8) | American(16.1) | English(13.7) | Irish(12.3) | Dutch(9.5) |
| Forest Lake | Lake County | German(37.6) | Irish(17.9) | Italian(12.7) | Polish(11.7) | English(5.9) |
| Forest Park | Cook County | Irish(12.9) | German(12.3) | Italian(8.0) | Polish(4.9) | English(3.7) |
| Forest View | Cook County | German(20.3) | Czech(17.4) | Polish(13.1) | Irish(12.6) | Italian(10.3) |
| Forrest | Livingston County | German(44.0) | American(19.1) | Irish(15.8) | English(6.4) | Italian(3.5) |
| Forreston | Ogle County | German(46.5) | Irish(16.3) | American(14.0) | English(4.2) | Dutch(3.2) |
| Forsyth | Macon County | German(21.2) | Irish(16.9) | English(12.0) | American(11.5) | Dutch(3.3) |
| Fowler | Adams County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Fox Lake | Lake County | German(30.7) | Polish(22.4) | Irish(19.3) | Italian(11.6) | English(4.4) |
| Fox Lake Hills | Lake County | German(37.2) | Polish(27.0) | Irish(19.1) | Italian(15.1) | American(7.6) |
| Fox River Grove | McHenry County | German(33.5) | Irish(17.2) | Italian(11.1) | Polish(10.9) | American(8.4) |
| Frankfort | Will County | German(26.8) | Irish(22.9) | Polish(18.0) | Italian(14.3) | English(7.0) |
| Frankfort Square | Will County | German(31.2) | Polish(25.9) | Irish(25.1) | Italian(20.4) | English(6.7) |
| Franklin | Morgan County | American(29.5) | German(21.4) | English(16.1) | Irish(15.8) | Swedish(2.7) |
| Franklin Grove | Lee County | German(32.5) | Irish(22.9) | American(17.3) | English(10.1) | Swedish(5.2) |
| Franklin Park | Cook County | Polish(22.2) | German(11.2) | Italian(10.5) | Irish(8.2) | American(2.1) |
| Frederick | Schuyler County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Freeburg | Saint Clair County | German(52.3) | Irish(14.5) | English(12.7) | French(4.9) | American(4.2) |
| Freeman Spur | Williamson County | English(20.1) | Italian(15.9) | German(13.3) | Irish(7.5) | French(4.9) |
| Freeport | Stephenson County | German(36.7) | Irish(10.9) | American(9.1) | English(8.2) | Dutch(4.6) |
| Fulton | Whiteside County | Dutch(33.1) | German(29.0) | Irish(13.1) | American(6.4) | English(3.8) |
| Fults | Monroe County | German(81.1) | Irish(8.1) | French(8.1) | Polish(5.4) | Italian(2.7) |
| Gages Lake | Lake County | German(26.1) | Irish(14.2) | Polish(9.9) | English(7.5) | Italian(6.9) |
| Galatia | Saline County | Irish(24.3) | German(21.1) | English(10.1) | American(9.8) | Dutch(8.4) |
| Galena | Jo Daviess County | German(41.7) | Irish(17.7) | English(10.3) | American(9.6) | Polish(7.2) |
| Galesburg | Knox County | German(19.1) | Irish(12.7) | English(9.1) | Swedish(9.0) | American(6.7) |
| Galt | Whiteside County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Galva | Henry County | German(26.1) | Swedish(24.5) | English(14.2) | Irish(10.4) | American(5.8) |
| Garden Prairie | Boone County | German(28.8) | American(24.3) | Polish(12.8) | Irish(11.9) | Italian(9.1) |
| Gardner | Grundy County | German(25.3) | Irish(20.0) | Italian(15.3) | English(13.3) | Norwegian(8.6) |
| Garrett | Douglas County | German(34.5) | American(11.7) | Scottish(9.4) | Irish(8.8) | Italian(5.3) |
| Gays | Moultrie County | German(24.4) | Irish(8.8) | American(8.5) | English(4.9) | French(4.2) |
| Geff | Wayne County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Geneseo | Henry County | German(31.1) | Irish(19.6) | Swedish(11.3) | English(10.8) | Italian(8.7) |
| Geneva | Kane County | German(35.4) | Irish(21.3) | Italian(13.1) | English(9.4) | Polish(7.8) |
| Genoa | DeKalb County | German(38.4) | Irish(17.8) | Polish(10.6) | Italian(8.2) | English(6.4) |
| Georgetown | McDonough County | German(28.1) | English(18.3) | American(14.7) | Scottish(11.3) | Italian(8.8) |
| Georgetown | Vermilion County | American(37.0) | German(13.6) | English(11.4) | Irish(5.4) | Assyrian/Chaldean/Syriac(3.8) |
| Gerlaw | Warren County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| German Valley | Stephenson County | German(62.0) | American(15.8) | Irish(8.0) | English(7.3) | Dutch(5.2) |
| Germantown | Clinton County | German(74.5) | American(5.8) | Irish(4.2) | English(2.4) | French(2.3) |
| Germantown Hills | Woodford County | German(35.7) | Irish(21.3) | English(11.0) | American(6.8) | European(4.1) |
| Gibson City | Ford County | German(36.6) | Irish(19.1) | American(19.0) | English(8.8) | Swedish(3.6) |
| Gifford | Champaign County | German(43.2) | Irish(13.7) | English(10.3) | Scottish(5.7) | Swedish(5.0) |
| Gilberts | Kane County | Polish(23.2) | Irish(16.5) | German(14.9) | Italian(7.3) | Portuguese(3.7) |
| Gillespie | Macoupin County | German(32.4) | Irish(19.3) | Italian(14.3) | English(8.4) | American(5.1) |
| Gilman | Iroquois County | German(27.8) | Irish(13.1) | American(9.3) | English(8.6) | French(3.8) |
| Gilson | Knox County | German(40.9) | Swedish(29.9) | English(11.7) | Croatian(5.8) | American(5.2) |
| Girard | Macoupin County | German(28.0) | Irish(18.9) | English(12.5) | American(8.6) | Swedish(6.7) |
| Gladstone | Henderson County | German(31.0) | Irish(16.1) | American(7.9) | Swedish(7.0) | English(6.3) |
| Glasford | Peoria County | German(31.9) | American(15.6) | English(12.3) | Irish(7.3) | Italian(3.6) |
| Glasgow | Scott County | American(49.1) | Irish(15.1) | German(10.1) | Welsh(5.7) | English(3.1) |
| Glen Carbon | Madison County | German(29.0) | English(12.1) | Irish(11.8) | American(6.0) | Polish(5.7) |
| Glen Ellyn | DuPage County | German(28.3) | Irish(24.3) | English(11.9) | Polish(11.6) | Italian(10.2) |
| Glenarm | Sangamon County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Glencoe | Cook County | German(14.2) | Russian(13.1) | Irish(10.5) | English(9.2) | American(7.7) |
| Glendale Heights | DuPage County | German(12.5) | Polish(8.6) | Italian(6.6) | Irish(6.3) | English(2.5) |
| Glenview | Cook County | German(19.6) | Irish(14.6) | Polish(10.9) | Italian(9.4) | Russian(6.2) |
| Glenwood | Cook County | German(9.4) | Italian(4.9) | Irish(3.9) | French(2.2) | Polish(2.1) |
| Godfrey | Madison County | German(38.9) | English(13.7) | Irish(13.4) | American(9.5) | French(4.0) |
| Godley | Will County | Irish(32.5) | German(30.6) | Italian(7.0) | English(6.4) | French(5.8) |
| Golconda | Pope County | German(28.3) | Irish(22.1) | English(14.2) | American(7.2) | Danish(4.9) |
| Golden | Adams County | German(46.2) | Irish(9.0) | English(9.0) | American(8.9) | Dutch(2.6) |
| Golden Eagle | Calhoun County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Golden Gate | Wayne County | German(18.7) | English(14.7) | Irish(5.3) | (n/a) | (n/a) |
| Golf | Cook County | German(35.8) | Irish(31.5) | English(11.7) | Italian(11.2) | Polish(10.0) |
| Good Hope | McDonough County | German(23.2) | American(14.3) | English(13.4) | Irish(11.5) | European(2.9) |
| Goodfield | Woodford County | German(45.1) | Irish(13.0) | English(8.2) | European(6.5) | Swiss(6.3) |
| Goofy Ridge | Mason County | English(15.8) | German(11.3) | American(9.0) | Irish(4.5) | Dutch(2.6) |
| Goreville | Johnson County | English(16.4) | German(14.6) | American(14.3) | Irish(9.6) | Polish(5.6) |
| Gorham | Jackson County | German(23.5) | English(11.6) | American(7.9) | French(2.6) | Scottish(2.0) |
| Grafton | Jersey County | German(27.4) | English(20.6) | Irish(19.0) | American(10.2) | French(5.4) |
| Grand Chain | Pulaski County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Grand Detour | Ogle County | Irish(31.1) | German(30.1) | English(16.6) | American(8.1) | Italian(5.1) |
| Grand Ridge | LaSalle County | Irish(38.2) | German(32.1) | English(7.7) | Czech(6.6) | Italian(5.3) |
| Grand Tower | Jackson County | German(24.3) | Irish(16.5) | English(15.4) | American(5.6) | Scotch-Irish(3.7) |
| Grandview | Sangamon County | German(23.1) | Irish(12.2) | English(9.8) | American(9.1) | Italian(4.6) |
| Grandwood Park | Lake County | German(21.6) | Irish(15.5) | Polish(11.8) | Italian(6.5) | English(6.1) |
| Granite City | Madison County | German(20.4) | Irish(19.1) | English(10.7) | American(9.6) | Italian(4.9) |
| Grant Park | Kankakee County | German(43.0) | Irish(17.1) | Italian(16.2) | Polish(13.1) | Swedish(6.0) |
| Grantfork | Madison County | German(38.9) | Irish(16.2) | American(8.0) | Dutch(5.6) | English(4.7) |
| Grantsburg | Johnson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Granville | Putnam County | German(42.8) | Irish(19.5) | Italian(17.7) | Polish(13.3) | English(6.5) |
| Graymont | Livingston County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Grayslake | Lake County | German(29.8) | Irish(16.6) | Polish(13.6) | Italian(9.3) | English(7.2) |
| Grayville | White County | German(20.1) | English(11.9) | Irish(11.1) | American(10.9) | Scottish(3.5) |
| Great Lakes | Lake County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Green Oaks | Lake County | German(23.8) | Irish(16.0) | English(12.7) | Polish(9.9) | American(8.9) |
| Green Valley | Tazewell County | American(28.1) | German(26.6) | Irish(8.5) | English(5.7) | Scotch-Irish(1.5) |
| Greenfield | Greene County | German(35.1) | Irish(22.7) | American(13.0) | English(12.3) | Scottish(2.3) |
| Greenup | Cumberland County | German(35.5) | English(14.2) | American(12.9) | Irish(11.9) | French(2.9) |
| Greenview | Menard County | German(38.4) | American(23.9) | Irish(14.5) | English(9.0) | Dutch(7.5) |
| Greenville | Bond County | German(25.8) | English(15.7) | Irish(9.0) | French(6.7) | American(5.3) |
| Greenwood | McHenry County | German(55.0) | Irish(23.7) | English(8.3) | Norwegian(8.3) | Swedish(6.8) |
| Gridley | McLean County | German(43.1) | American(19.6) | English(14.0) | Irish(11.1) | French(3.8) |
| Griggsville | Pike County | German(24.4) | American(17.0) | English(13.2) | Irish(11.9) | Scotch-Irish(3.0) |
| Groveland | Tazewell County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Gulf Port | Henderson County | German(42.1) | American(36.8) | Irish(15.8) | English(10.5) | (n/a) |
| Gurnee | Lake County | German(21.3) | Irish(15.1) | Polish(10.1) | Italian(8.6) | English(7.7) |
| Hainesville | Lake County | German(20.5) | Polish(13.4) | Irish(11.5) | Italian(9.5) | Russian(5.3) |
| Hamburg | Calhoun County | German(57.4) | Irish(13.6) | Scotch-Irish(11.1) | Hungarian(8.0) | English(8.0) |
| Hamel | Madison County | German(58.0) | Irish(12.1) | English(7.9) | French(6.1) | American(5.7) |
| Hamilton | Hancock County | German(34.2) | Irish(16.0) | English(11.4) | American(8.4) | Scottish(6.1) |
| Hammond | Piatt County | German(22.3) | American(19.5) | English(14.1) | Irish(9.0) | Italian(4.9) |
| Hampshire | Kane County | German(29.5) | Irish(24.4) | Italian(15.9) | Polish(12.2) | American(5.2) |
| Hampton | Rock Island County | German(26.7) | Irish(14.8) | English(7.5) | Swedish(6.7) | Belgian(6.1) |
| Hanaford | Franklin County | Irish(27.6) | German(22.1) | English(21.7) | Polish(8.8) | Dutch(7.8) |
| Hanna City | Peoria County | German(35.2) | English(12.3) | Irish(12.1) | American(6.8) | French(5.6) |
| Hanover | Jo Daviess County | German(37.7) | English(20.4) | Irish(19.6) | French(7.6) | American(6.0) |
| Hanover Park | Cook County | German(13.3) | Polish(9.8) | Irish(8.5) | Italian(5.8) | English(2.8) |
| Hardin | Calhoun County | German(45.9) | Irish(14.4) | English(13.0) | French(6.6) | Arab(5.0) |
| Harmon | Lee County | German(42.7) | Irish(19.7) | English(12.1) | American(4.5) | Polish(1.9) |
| Harrisburg | Saline County | Irish(19.2) | German(17.6) | English(12.7) | American(10.6) | Hungarian(2.7) |
| Harrison | Jackson County | Irish(28.0) | American(24.0) | German(16.0) | English(8.4) | Italian(6.9) |
| Harristown | Macon County | German(28.3) | Irish(18.2) | American(15.5) | English(12.6) | Scotch-Irish(2.4) |
| Hartford | Madison County | German(25.8) | Irish(13.7) | American(10.3) | English(9.8) | Dutch(6.2) |
| Hartsburg | Logan County | German(53.3) | American(10.8) | Irish(7.1) | English(5.4) | European(5.0) |
| Harvard | McHenry County | German(18.9) | Irish(13.4) | Polish(7.3) | English(5.2) | American(3.8) |
| Harvel | Montgomery County | German(11.3) | French(3.6) | Dutch(3.1) | English(2.6) | American(2.1) |
| Harvey | Cook County | African(1.0) | Polish(1.0) | American(0.7) | English(0.6) | German(0.6) |
| Harwood Heights | Cook County | Polish(30.1) | Italian(17.9) | German(11.8) | Irish(6.2) | Serbian(4.9) |
| Havana | Mason County | German(29.7) | American(17.5) | Irish(8.2) | English(6.2) | Polish(3.0) |
| Hawthorn Woods | Lake County | German(27.9) | Irish(13.8) | Italian(10.2) | Polish(9.0) | American(7.9) |
| Hazel Crest | Cook County | German(3.8) | Irish(2.0) | African(1.5) | American(1.3) | Polish(1.2) |
| Hebron | McHenry County | German(39.1) | Irish(16.3) | English(10.5) | Italian(9.8) | Polish(8.9) |
| Hecker | Monroe County | German(55.6) | Irish(22.7) | French(14.7) | English(10.1) | Italian(6.7) |
| Henderson | Knox County | English(24.3) | German(16.2) | Irish(15.6) | Swedish(13.8) | American(13.5) |
| Hennepin | Putnam County | German(39.0) | Irish(25.0) | Italian(13.5) | English(9.4) | Polish(6.1) |
| Henning | Vermilion County | American(19.3) | German(16.4) | Irish(9.2) | Dutch(3.7) | English(3.7) |
| Henry | Marshall County | German(39.7) | Irish(16.8) | English(15.0) | American(7.9) | Italian(5.4) |
| Heritage Lake | Tazewell County | German(38.9) | Irish(15.9) | English(14.1) | American(12.6) | Dutch(5.7) |
| Herod | Pope County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Herrick | Shelby County | English(10.7) | German(6.2) | American(4.8) | Irish(3.7) | French(3.1) |
| Herrin | Williamson County | German(23.4) | English(15.9) | Irish(14.7) | American(11.9) | Italian(10.8) |
| Herscher | Kankakee County | German(40.7) | Irish(19.5) | French(15.3) | Polish(8.2) | Italian(6.6) |
| Hettick | Macoupin County | German(26.8) | Irish(14.5) | English(13.1) | American(7.1) | Polish(0.5) |
| Heyworth | McLean County | German(35.2) | American(20.5) | English(11.4) | Irish(8.7) | Swedish(3.8) |
| Hickory Hills | Cook County | Polish(28.0) | Irish(17.1) | German(12.1) | Italian(9.3) | Arab(5.1) |
| Hidalgo | Jasper County | German(23.5) | American(22.1) | English(8.1) | Irish(5.1) | Welsh(2.9) |
| Highland | Madison County | German(45.1) | Irish(11.2) | American(9.4) | English(6.9) | Italian(5.4) |
| Highland Park | Lake County | German(18.3) | Russian(18.2) | American(9.8) | Polish(9.4) | Irish(8.0) |
| Highwood | Lake County | Italian(12.6) | German(5.6) | American(5.3) | Russian(2.5) | Irish(2.3) |
| Hillcrest | Ogle County | German(24.5) | Irish(11.2) | American(7.7) | English(6.8) | Swedish(3.2) |
| Hillsboro | Montgomery County | German(16.3) | Irish(10.1) | American(8.5) | English(7.8) | Italian(3.3) |
| Hillsdale | Rock Island County | German(24.2) | American(13.1) | Irish(7.5) | Dutch(6.6) | Belgian(5.5) |
| Hillside | Cook County | German(7.3) | Italian(5.5) | Irish(4.9) | Polish(4.4) | Czech(1.9) |
| Hillview | Greene County | German(35.0) | Irish(11.4) | American(6.4) | Dutch(3.6) | English(3.6) |
| Hinckley | DeKalb County | German(39.1) | Irish(22.4) | English(11.5) | Norwegian(8.4) | Swedish(6.2) |
| Hindsboro | Douglas County | German(22.0) | American(20.5) | English(10.2) | Irish(4.7) | Canadian(1.6) |
| Hines | Cook County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Hinsdale | DuPage County | German(24.9) | Irish(21.2) | English(12.6) | Polish(10.1) | Italian(10.1) |
| Hodgkins | Cook County | German(19.9) | Irish(13.4) | Polish(11.1) | Italian(9.8) | English(3.7) |
| Hoffman | Clinton County | German(50.6) | Irish(10.9) | American(7.2) | Polish(4.3) | English(2.8) |
| Hoffman Estates | Cook County | German(16.8) | Polish(13.2) | Irish(10.4) | Italian(8.6) | English(5.2) |
| Holcomb | Ogle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Holiday Hills | McHenry County | German(37.6) | Irish(17.9) | Polish(16.3) | English(12.0) | American(8.2) |
| Holiday Shores | Madison County | German(34.4) | English(17.0) | Irish(10.5) | Italian(9.4) | American(8.7) |
| Hollowayville | Bureau County | German(35.2) | American(25.9) | English(24.1) | Italian(18.5) | Polish(11.1) |
| Homer | Champaign County | German(25.3) | American(23.2) | English(15.8) | Irish(13.5) | Russian(2.6) |
| Homer Glen | Will County | Polish(24.6) | Irish(20.7) | German(18.2) | Italian(15.6) | Lithuanian(6.6) |
| Hometown | Cook County | Irish(28.2) | German(26.2) | Polish(22.2) | Italian(17.2) | English(5.3) |
| Homewood | Cook County | German(18.1) | Irish(17.2) | Polish(8.2) | Italian(8.0) | English(5.6) |
| Hoopeston | Vermilion County | German(23.8) | American(17.3) | English(10.0) | Irish(8.6) | Italian(3.3) |
| Hooppole | Henry County | German(26.1) | Swedish(15.6) | Irish(8.8) | Norwegian(4.9) | Belgian(4.6) |
| Hopedale | Tazewell County | German(38.5) | English(13.6) | Irish(10.8) | American(10.7) | French(5.7) |
| Hopewell | Marshall County | German(38.3) | Irish(16.1) | Italian(10.3) | Polish(8.6) | American(8.4) |
| Hopkins Park | Kankakee County | German(1.4) | Polish(1.2) | Dutch(1.1) | Irish(0.5) | Scottish(0.4) |
| Hoyleton | Washington County | German(41.0) | Irish(7.4) | English(4.8) | Scotch-Irish(4.4) | American(4.4) |
| Hudson | McLean County | German(35.4) | Irish(19.5) | American(13.9) | English(11.6) | Polish(4.1) |
| Huey | Clinton County | German(44.6) | English(6.9) | American(6.4) | Polish(5.4) | Slovak(5.4) |
| Hull | Pike County | German(22.1) | Irish(17.4) | English(11.1) | American(9.6) | Scotch-Irish(4.0) |
| Humboldt | Coles County | Irish(17.8) | German(14.2) | English(8.4) | American(8.1) | Polish(2.3) |
| Hume | Edgar County | German(27.9) | Irish(20.7) | American(13.8) | English(9.4) | French(5.4) |
| Huntley | McHenry County | German(29.6) | Polish(17.4) | Irish(16.0) | Italian(14.8) | English(7.2) |
| Huntsville | Schuyler County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Hurst | Williamson County | German(35.1) | English(24.6) | Irish(23.1) | Scottish(4.4) | Italian(3.2) |
| Hutsonville | Crawford County | German(22.9) | English(20.7) | American(12.5) | Irish(12.0) | Dutch(3.6) |
| Illinois City | Rock Island County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Illiopolis | Sangamon County | German(25.3) | Irish(16.2) | English(13.9) | American(11.7) | Polish(3.3) |
| Ina | Jefferson County | German(17.2) | Irish(16.0) | English(7.8) | American(4.3) | Dutch(3.7) |
| Indian Creek | Lake County | German(12.7) | Polish(11.6) | Russian(10.1) | Irish(9.7) | American(8.9) |
| Indian Head Park | Cook County | German(20.6) | Irish(19.1) | Polish(12.7) | Italian(11.6) | English(9.7) |
| Indianola | Vermilion County | American(39.3) | German(11.5) | English(10.5) | Irish(10.2) | French(4.2) |
| Industry | McDonough County | German(21.5) | American(19.2) | Irish(15.8) | English(8.0) | Italian(5.1) |
| Ingalls Park | Will County | Irish(23.9) | German(23.8) | Italian(6.4) | Polish(5.5) | French(5.3) |
| Ingleside | Lake County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Ingraham | Clay County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Inverness | Cook County | German(28.7) | Italian(17.6) | Irish(16.7) | Polish(11.2) | English(10.4) |
| Iola | Clay County | American(22.3) | German(12.6) | French(5.8) | Celtic(5.8) | Dutch(4.9) |
| Ipava | Fulton County | German(23.8) | American(19.0) | Irish(15.1) | English(10.3) | Dutch(4.2) |
| Iroquois | Iroquois County | German(46.2) | Irish(33.5) | American(10.4) | English(6.9) | French(3.5) |
| Irving | Montgomery County | German(19.9) | Irish(9.9) | English(9.3) | American(3.3) | Russian(1.8) |
| Irvington | Washington County | German(33.3) | Irish(18.6) | English(15.0) | American(6.5) | Polish(3.3) |
| Irwin | Kankakee County | Irish(19.3) | German(14.8) | French(10.2) | Norwegian(8.0) | Polish(8.0) |
| Island Lake | McHenry County | German(29.4) | Irish(18.0) | Polish(11.8) | Italian(9.3) | English(7.4) |
| Itasca | DuPage County | German(20.6) | Polish(18.1) | Irish(16.8) | Italian(15.2) | English(3.4) |
| Iuka | Marion County | English(19.7) | German(18.6) | Irish(17.8) | Dutch(2.9) | Swedish(2.0) |
| Ivesdale | Champaign County | German(32.3) | American(29.5) | Irish(27.6) | French(5.9) | English(2.8) |
| Jacksonville | Morgan County | German(25.3) | American(22.3) | Irish(11.7) | English(10.6) | Italian(2.0) |
| Jacob | Jackson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Jeffersonville | Wayne County | German(14.6) | American(12.0) | Irish(4.7) | Hungarian(4.5) | English(2.6) |
| Jeisyville | Christian County | German(10.7) | American(8.8) | English(6.3) | French(3.8) | Scottish(3.8) |
| Jerome | Sangamon County | German(27.7) | English(21.7) | Irish(19.1) | American(12.5) | Italian(6.1) |
| Jerseyville | Jersey County | German(35.1) | Irish(16.4) | English(9.7) | American(7.9) | French(3.5) |
| Jewett | Cumberland County | German(26.3) | Irish(16.6) | American(15.4) | Dutch(9.7) | English(6.1) |
| Johnsburg | McHenry County | German(35.7) | Irish(21.2) | Polish(12.8) | Italian(9.0) | English(7.7) |
| Johnsonville | Wayne County | German(7.8) | Irish(3.9) | English(1.3) | (n/a) | (n/a) |
| Johnston City | Williamson County | English(20.1) | Irish(15.8) | German(15.6) | American(10.6) | Scotch-Irish(3.6) |
| Joliet | Will County | German(16.6) | Irish(15.4) | Polish(9.3) | Italian(9.2) | English(4.5) |
| Jonesboro | Union County | German(30.5) | Irish(15.7) | American(10.6) | English(10.1) | French(2.4) |
| Joppa | Massac County | German(12.9) | Irish(10.6) | American(8.7) | English(7.4) | European(2.6) |
| Joy | Mercer County | German(17.7) | American(8.7) | Irish(7.0) | Swedish(6.8) | English(6.0) |
| Junction | Gallatin County | American(19.1) | Irish(10.5) | Italian(5.9) | German(4.6) | Russian(4.6) |
| Junction City | Marion County | German(21.7) | Irish(21.1) | American(17.6) | Polish(4.7) | English(3.6) |
| Justice | Cook County | Polish(26.3) | German(11.4) | Irish(8.8) | Italian(7.1) | American(4.5) |
| Kampsville | Calhoun County | German(44.9) | Irish(13.4) | English(11.0) | French(7.9) | Dutch(3.8) |
| Kane | Greene County | German(27.8) | Irish(20.0) | Dutch(12.9) | English(7.6) | Italian(6.6) |
| Kaneville | Kane County | German(33.5) | Italian(14.2) | Irish(12.3) | Swedish(9.2) | American(8.1) |
| Kangley | LaSalle County | German(27.9) | Irish(23.8) | English(13.5) | Slovak(10.2) | Polish(5.2) |
| Kankakee | Kankakee County | German(13.3) | Irish(7.5) | French(6.8) | English(4.0) | Italian(2.7) |
| Kansas | Edgar County | German(23.7) | Irish(14.9) | American(12.5) | English(11.5) | Scottish(3.4) |
| Kappa | Woodford County | Irish(33.3) | German(23.5) | American(20.6) | English(5.6) | Canadian(3.6) |
| Karnak | Pulaski County | German(28.4) | American(14.4) | Irish(10.7) | English(6.0) | French(4.2) |
| Kasbeer | Bureau County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Kaskaskia | Randolph County | (n/a) | (n/a) | (n/a) | (n/a) | (n/a) |
| Keenes | Wayne County | American(10.9) | English(3.1) | French(3.1) | (n/a) | (n/a) |
| Keensburg | Wabash County | German(16.3) | English(5.8) | Irish(4.7) | French(2.3) | Norwegian(1.2) |
| Keithsburg | Mercer County | German(21.0) | Irish(17.3) | American(14.3) | English(11.0) | Polish(5.1) |
| Kell | Marion County | Irish(17.6) | English(12.5) | German(11.1) | American(9.3) | Polish(2.3) |
| Kempton | Ford County | German(38.3) | English(21.3) | Irish(19.1) | Dutch(9.8) | American(7.1) |
| Kenilworth | Cook County | Irish(23.5) | German(20.2) | English(18.8) | Italian(10.7) | Polish(7.9) |
| Kenney | De Witt County | American(48.2) | German(13.6) | Irish(7.6) | English(5.1) | Dutch(5.1) |
| Kent | Stephenson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Kewanee | Henry County | German(24.6) | Irish(12.4) | English(9.5) | Swedish(7.3) | Belgian(6.7) |
| Keyesport | Bond County | German(19.7) | Irish(16.3) | American(13.2) | English(10.0) | French(3.3) |
| Kilbourne | Mason County | American(38.1) | German(16.9) | Irish(5.6) | Dutch(3.0) | English(3.0) |
| Kildeer | Lake County | German(21.0) | American(16.1) | Irish(15.9) | Polish(14.1) | Italian(12.4) |
| Kincaid | Christian County | German(12.7) | Irish(10.9) | Italian(10.1) | American(9.6) | English(7.6) |
| Kinderhook | Pike County | German(27.9) | Irish(10.2) | English(8.1) | Italian(7.6) | Dutch(7.6) |
| Kingston | DeKalb County | German(48.3) | Irish(23.7) | English(10.4) | Italian(8.5) | Polish(7.8) |
| Kingston Mines | Peoria County | German(29.0) | Irish(16.5) | American(12.1) | Dutch(11.3) | English(5.2) |
| Kinmundy | Marion County | German(23.5) | English(20.9) | Irish(18.3) | American(11.0) | Dutch(3.0) |
| Kinsman | Grundy County | German(28.3) | Irish(23.6) | English(12.6) | Norwegian(9.4) | Polish(7.1) |
| Kirkland | DeKalb County | German(39.8) | Irish(23.1) | English(11.6) | Polish(8.9) | Italian(7.5) |
| Kirkwood | Warren County | German(19.7) | Irish(12.0) | Swedish(9.1) | American(7.5) | English(7.2) |
| Knollwood | Lake County | German(14.9) | Irish(14.4) | English(10.9) | Polish(7.9) | American(7.9) |
| Knoxville | Knox County | German(20.7) | Irish(20.1) | English(14.1) | Swedish(10.9) | American(5.0) |
| La Fayette | Stark County | Irish(25.2) | German(24.4) | Swedish(16.3) | English(10.4) | Italian(5.6) |
| La Grange | Cook County | Irish(33.5) | German(21.1) | Polish(12.4) | Italian(11.6) | English(8.6) |
| La Grange Park | Cook County | German(21.6) | Irish(20.9) | Italian(14.9) | Polish(13.7) | English(7.4) |
| La Harpe | Hancock County | German(22.9) | American(15.0) | English(14.6) | Irish(7.9) | Swedish(5.5) |
| La Moille | Bureau County | German(41.2) | Irish(17.5) | English(10.7) | Italian(6.7) | American(5.9) |
| La Prairie | Adams County | German(47.1) | Scotch-Irish(5.9) | (n/a) | (n/a) | (n/a) |
| La Rose | Marshall County | German(38.5) | Irish(29.5) | English(16.4) | American(5.7) | Dutch(4.9) |
| Lacon | Marshall County | German(32.0) | Irish(29.2) | English(18.0) | American(8.2) | Polish(5.2) |
| Ladd | Bureau County | German(32.3) | Italian(28.0) | Irish(19.6) | English(11.1) | American(8.4) |
| Lake Barrington | Lake County | German(35.7) | Irish(17.8) | Italian(11.9) | Polish(10.3) | English(9.6) |
| Lake Bluff | Lake County | German(26.1) | Irish(21.5) | English(20.5) | Italian(9.4) | Polish(6.6) |
| Lake Camelot | Peoria County | German(33.0) | English(15.1) | Irish(13.1) | Italian(5.9) | American(5.2) |
| Lake Catherine | Lake County | German(32.3) | Irish(29.6) | Polish(12.9) | American(8.4) | Italian(6.5) |
| Lake Forest | Lake County | German(26.8) | Irish(17.9) | English(13.7) | Italian(9.8) | American(6.7) |
| Lake Fork | Logan County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Lake Holiday | LaSalle County | German(39.7) | Irish(19.0) | Italian(11.5) | Polish(8.6) | English(8.0) |
| Lake in the Hills | McHenry County | German(28.5) | Irish(19.0) | Polish(17.5) | Italian(14.1) | English(5.5) |
| Lake Ka-Ho | Macoupin County | German(27.9) | Irish(25.4) | American(11.3) | English(8.3) | French(6.7) |
| Lake of the Woods | Champaign County | American(28.6) | German(28.4) | English(8.6) | Irish(7.8) | European(4.0) |
| Lake Petersburg | Menard County | German(37.1) | English(21.5) | Irish(15.9) | Italian(5.8) | Dutch(4.1) |
| Lake Summerset | Winnebago County | German(28.2) | Irish(21.4) | English(9.9) | Polish(9.2) | Italian(8.9) |
| Lake Villa | Lake County | German(31.8) | Irish(18.9) | Polish(14.6) | English(7.6) | Italian(6.7) |
| Lake Zurich | Lake County | German(26.6) | Polish(16.6) | Irish(16.3) | Italian(12.0) | English(7.8) |
| Lakemoor | Lake County | German(33.3) | Polish(18.1) | Irish(17.3) | Italian(13.8) | Norwegian(6.8) |
| Lakewood | McHenry County | German(34.1) | Irish(20.1) | Polish(18.1) | English(10.7) | Swedish(5.6) |
| Lakewood Shores | Will County | German(30.6) | Polish(18.9) | Irish(16.9) | Italian(16.5) | English(7.1) |
| Lanark | Carroll County | German(42.8) | Irish(12.5) | American(11.1) | Dutch(8.5) | English(7.7) |
| Lane | De Witt County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Langleyville | Christian County | German(29.8) | Irish(18.2) | English(12.1) | American(9.1) | Italian(3.2) |
| Lansing | Cook County | German(14.3) | Polish(13.1) | Irish(10.3) | Dutch(8.1) | Italian(7.0) |
| LaPlace | Piatt County | German(28.3) | Dutch(21.7) | English(10.5) | Irish(5.9) | British(5.9) |
| LaSalle | LaSalle County | German(36.0) | Irish(16.9) | Polish(16.0) | Italian(13.6) | English(5.3) |
| Latham | Logan County | German(33.0) | American(20.1) | English(11.6) | Irish(10.2) | Dutch(4.3) |
| Laura | Peoria County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Lawndale | Logan County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Lawrenceville | Lawrence County | German(15.5) | Irish(11.1) | English(9.9) | American(9.3) | French(2.4) |
| Le Roy | McLean County | German(29.7) | Irish(17.3) | American(17.0) | English(12.2) | Italian(3.3) |
| Leaf River | Ogle County | German(43.0) | Irish(10.0) | Italian(9.7) | American(9.2) | Hungarian(8.0) |
| Lebanon | Saint Clair County | German(28.6) | English(14.7) | Irish(7.2) | American(6.9) | Scottish(5.0) |
| Lee | Lee County | German(35.7) | Irish(33.7) | English(19.7) | Norwegian(11.0) | Czech(5.1) |
| Lee Center | Lee County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Leland | LaSalle County | German(41.2) | Norwegian(15.7) | Irish(13.4) | English(12.3) | Polish(6.1) |
| Leland Grove | Sangamon County | German(28.4) | English(21.0) | Irish(17.9) | Scotch-Irish(6.8) | Italian(6.2) |
| Lemont | Cook County | Polish(26.5) | Irish(20.6) | German(17.7) | Italian(13.4) | Lithuanian(8.2) |
| Lena | Stephenson County | German(49.6) | Irish(17.9) | English(10.5) | American(9.3) | Polish(3.9) |
| Lenzburg | Saint Clair County | German(27.1) | American(16.0) | Irish(12.5) | French(5.6) | English(3.3) |
| Leonore | LaSalle County | German(57.0) | English(25.3) | Irish(19.0) | Swedish(17.7) | Italian(13.9) |
| Lerna | Coles County | German(30.2) | Irish(15.0) | American(10.5) | English(5.2) | Dutch(2.4) |
| Lewistown | Fulton County | German(20.9) | American(19.2) | Irish(10.7) | English(7.4) | Polish(4.7) |
| Lexington | McLean County | German(40.8) | Irish(17.3) | English(12.9) | American(12.3) | Swedish(3.5) |
| Liberty | Adams County | German(63.0) | English(16.8) | Irish(4.8) | Czech(3.8) | Finnish(3.1) |
| Libertyville | Lake County | German(27.8) | Irish(17.2) | Italian(11.3) | English(10.5) | Polish(10.2) |
| Lily Lake | Kane County | German(29.7) | Irish(21.6) | Polish(13.0) | American(12.1) | Italian(8.9) |
| Lima | Adams County | German(37.0) | Dutch(17.5) | Italian(15.5) | Irish(12.5) | English(6.0) |
| Limestone | Kankakee County | German(33.2) | French(17.5) | Irish(15.1) | English(11.8) | American(8.6) |
| Lincoln | Logan County | German(29.2) | American(18.0) | Irish(14.4) | English(11.9) | Italian(3.1) |
| Lincolnshire | Lake County | German(22.8) | Irish(13.3) | Polish(13.3) | American(10.1) | Russian(9.0) |
| Lincolnwood | Cook County | Greek(7.3) | German(6.1) | Russian(5.8) | Polish(5.8) | Assyrian/Chaldean/Syriac(4.7) |
| Lindenhurst | Lake County | German(28.9) | Irish(20.7) | Polish(11.6) | English(9.9) | Italian(9.2) |
| Lindenwood | Ogle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Lisbon | Kendall County | Norwegian(34.5) | German(23.7) | Irish(11.4) | Italian(10.1) | Greek(6.6) |
| Lisle | DuPage County | German(23.8) | Irish(18.9) | Polish(11.8) | Italian(10.9) | English(5.4) |
| Litchfield | Montgomery County | German(29.0) | American(8.9) | English(8.8) | Irish(8.5) | Italian(5.4) |
| Little York | Warren County | German(32.1) | Irish(20.3) | English(12.5) | Italian(8.9) | American(7.4) |
| Littleton | Schuyler County | American(59.2) | German(11.5) | Irish(9.4) | English(6.3) | French(5.7) |
| Liverpool | Fulton County | English(37.4) | German(23.2) | Irish(7.1) | Italian(6.1) | Norwegian(3.0) |
| Livingston | Madison County | German(29.6) | Irish(14.4) | Italian(12.5) | English(8.1) | American(6.4) |
| Loami | Sangamon County | German(21.1) | English(15.2) | Irish(14.0) | American(5.9) | French(5.3) |
| Lockport | Will County | German(26.9) | Polish(25.0) | Irish(21.6) | Italian(17.5) | English(5.6) |
| Loda | Iroquois County | American(37.4) | German(28.3) | English(9.9) | Irish(8.3) | Polish(4.9) |
| Logan | Franklin County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Lomax | Henderson County | German(26.8) | Irish(19.8) | English(11.4) | Iranian(4.6) | Greek(4.6) |
| Lombard | DuPage County | German(28.0) | Irish(19.6) | Italian(14.4) | Polish(12.8) | English(7.3) |
| London Mills | Fulton County | Irish(22.7) | German(19.2) | American(12.7) | English(7.9) | Swedish(6.3) |
| Long Creek | Macon County | German(25.2) | American(20.5) | Irish(15.0) | English(12.7) | Italian(3.5) |
| Long Grove | Lake County | German(19.6) | Polish(10.0) | Italian(9.4) | Irish(9.4) | American(8.5) |
| Long Lake | Lake County | German(33.4) | Polish(10.7) | Irish(10.3) | Italian(7.1) | English(4.7) |
| Long Point | Livingston County | German(40.1) | Irish(38.4) | Polish(29.5) | English(11.0) | American(10.5) |
| Longview | Champaign County | American(33.7) | English(21.5) | Scottish(11.0) | German(9.8) | French(7.4) |
| Loraine | Adams County | German(26.1) | American(16.9) | Irish(13.7) | English(5.3) | Scotch-Irish(4.2) |
| Lost Nation | Ogle County | German(32.1) | English(31.2) | Irish(15.6) | British(9.6) | Polish(7.7) |
| Lostant | LaSalle County | German(31.1) | Polish(13.6) | Irish(11.5) | American(9.9) | European(8.4) |
| Louisville | Clay County | German(24.5) | English(12.7) | Irish(10.4) | American(9.0) | Dutch(1.3) |
| Lovejoy | Saint Clair County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Loves Park | Winnebago County | German(27.4) | Irish(15.8) | American(11.0) | Italian(10.0) | English(9.8) |
| Lovington | Moultrie County | German(22.0) | English(10.4) | Irish(8.1) | American(7.2) | Polish(2.1) |
| Lowpoint | Woodford County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Ludlow | Champaign County | American(28.7) | German(15.4) | Irish(15.2) | English(11.7) | Italian(6.5) |
| Lyndon | Whiteside County | German(24.2) | Irish(22.1) | American(13.7) | English(10.8) | Dutch(5.9) |
| Lynn Center | Henry County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Lynnville | Morgan County | German(42.2) | Irish(37.1) | American(35.3) | Swiss(0.9) | Dutch(0.9) |
| Lynwood | Cook County | German(7.6) | Polish(6.3) | Irish(3.9) | Dutch(3.6) | English(3.3) |
| Lyons | Cook County | Polish(18.7) | Irish(10.4) | German(9.1) | Italian(8.1) | Czech(4.8) |
| Macedonia | Franklin County | Irish(54.8) | German(22.6) | Ukrainian(12.9) | Lithuanian(6.5) | Greek(3.2) |
| Machesney Park | Winnebago County | German(35.6) | Irish(17.0) | English(11.8) | American(9.8) | Italian(8.8) |
| Mackinaw | Tazewell County | German(37.0) | American(14.8) | English(13.9) | Irish(12.7) | Italian(4.5) |
| Macomb | McDonough County | German(24.3) | Irish(15.6) | American(11.3) | English(9.7) | Italian(6.4) |
| Macon | Macon County | German(28.2) | American(23.3) | English(13.2) | Irish(11.8) | Dutch(3.4) |
| Madison | Madison County | European(13.4) | German(10.1) | Irish(8.4) | American(3.3) | Polish(2.8) |
| Maeystown | Monroe County | German(68.4) | Irish(18.6) | English(16.9) | Swiss(10.2) | Welsh(2.8) |
| Magnolia | Putnam County | German(23.5) | Irish(18.0) | Swedish(12.1) | English(10.4) | Dutch(9.3) |
| Mahomet | Champaign County | German(31.6) | American(11.3) | English(11.1) | Irish(8.5) | European(7.2) |
| Makanda | Jackson County | German(13.7) | Irish(12.3) | English(10.3) | Swedish(6.1) | Dutch(5.1) |
| Malden | Bureau County | German(35.1) | American(18.6) | Irish(14.8) | English(10.7) | Italian(7.9) |
| Malta | DeKalb County | German(31.5) | Irish(19.9) | American(10.4) | English(8.7) | Norwegian(6.0) |
| Manchester | Scott County | German(27.5) | American(26.0) | English(13.9) | Irish(5.3) | Portuguese(4.4) |
| Manhattan | Will County | German(32.2) | Irish(27.4) | Italian(19.1) | Polish(11.4) | French(5.6) |
| Manito | Mason County | German(33.7) | American(14.8) | Irish(10.3) | English(9.7) | French(3.2) |
| Manlius | Bureau County | German(46.5) | Swedish(10.4) | English(6.3) | Irish(6.3) | American(6.3) |
| Mansfield | Piatt County | American(25.0) | German(21.7) | Irish(12.6) | English(10.9) | French(3.6) |
| Manteno | Kankakee County | German(31.8) | Irish(24.3) | Italian(14.9) | Polish(14.8) | English(6.9) |
| Maple Park | Kane County | German(36.7) | Irish(17.2) | Polish(14.5) | English(11.1) | Italian(9.8) |
| Mapleton | Peoria County | German(36.5) | English(16.5) | American(8.4) | Irish(7.7) | European(4.2) |
| Maquon | Knox County | German(17.2) | American(16.7) | Irish(13.6) | Swedish(11.0) | Italian(7.3) |
| Marengo | McHenry County | German(36.4) | Irish(16.7) | Polish(11.1) | Italian(10.1) | English(6.9) |
| Marietta | Fulton County | German(21.2) | American(14.3) | Turkish(8.4) | Swedish(2.0) | Scottish(1.0) |
| Marine | Madison County | German(49.8) | Irish(14.8) | American(6.5) | English(6.3) | Polish(5.1) |
| Marion | Williamson County | German(24.3) | Irish(15.8) | English(13.5) | American(9.8) | Italian(4.4) |
| Marissa | Saint Clair County | German(41.7) | Irish(18.2) | American(13.3) | English(9.3) | Polish(7.2) |
| Mark | Putnam County | German(46.1) | Italian(22.6) | Polish(16.3) | Irish(14.5) | English(5.4) |
| Markham | Cook County | Irish(2.9) | German(2.6) | Italian(1.8) | Polish(1.8) | English(1.4) |
| Maroa | Macon County | German(24.4) | American(20.0) | Irish(13.1) | English(9.8) | French(5.2) |
| Marquette Heights | Tazewell County | German(26.7) | American(20.7) | Irish(12.8) | English(10.1) | Italian(4.0) |
| Marseilles | LaSalle County | German(27.8) | Irish(26.2) | Italian(11.0) | English(7.8) | Polish(7.4) |
| Marshall | Clark County | German(26.7) | Irish(10.8) | English(9.9) | American(7.8) | French(1.4) |
| Martinsville | Clark County | German(21.7) | American(13.3) | English(11.1) | Irish(10.7) | French(2.3) |
| Martinton | Iroquois County | German(38.1) | French(26.8) | Irish(20.6) | American(16.1) | Italian(7.4) |
| Maryville | Madison County | German(36.4) | Irish(15.7) | Italian(11.4) | English(7.6) | American(6.9) |
| Mascoutah | Saint Clair County | German(40.5) | Irish(14.8) | English(8.0) | American(6.1) | Polish(5.5) |
| Mason | Effingham County | German(24.9) | American(10.5) | English(8.3) | Irish(7.5) | Dutch(2.2) |
| Mason City | Mason County | German(26.9) | American(12.8) | English(10.2) | Irish(8.2) | Polish(3.2) |
| Matherville | Mercer County | German(19.8) | Irish(14.0) | English(10.3) | Swedish(8.7) | Dutch(7.3) |
| Matteson | Cook County | German(5.2) | Irish(3.2) | English(2.2) | American(2.1) | Italian(2.1) |
| Mattoon | Coles County | German(26.4) | Irish(16.8) | American(9.7) | English(9.5) | French(2.1) |
| Maunie | White County | Irish(66.0) | German(47.2) | English(16.0) | French(6.9) | Dutch(5.6) |
| Maywood | Cook County | American(1.8) | Irish(1.4) | African(1.3) | German(1.3) | Barbadian(0.7) |
| Mazon | Grundy County | German(27.5) | Irish(23.2) | Italian(19.6) | English(11.3) | Norwegian(6.0) |
| McClure | Alexander County | Irish(21.4) | German(20.7) | English(6.0) | American(5.5) | French(3.4) |
| McConnell | Stephenson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| McCook | Cook County | Polish(27.0) | Irish(26.3) | German(17.4) | Croatian(15.1) | Czech(8.2) |
| McCullom Lake | McHenry County | German(34.2) | Irish(21.0) | Polish(15.7) | English(8.1) | Italian(8.0) |
| McHenry | McHenry County | German(38.1) | Irish(18.7) | Polish(15.9) | Italian(8.4) | English(6.9) |
| McLean | McLean County | German(27.5) | American(22.3) | Irish(13.1) | English(10.7) | Polish(5.1) |
| McLeansboro | Hamilton County | German(29.7) | Irish(19.2) | American(14.2) | English(9.5) | Dutch(5.0) |
| McNabb | Putnam County | German(44.7) | Irish(32.0) | Italian(14.4) | American(11.8) | Swedish(6.3) |
| Mechanicsburg | Sangamon County | German(32.4) | Irish(15.5) | American(13.5) | French(8.0) | Slovak(7.0) |
| Media | Henderson County | German(27.3) | Irish(23.6) | Swedish(11.8) | English(11.8) | American(9.1) |
| Medinah | Du Page County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Medora | Macoupin County | German(36.3) | Irish(34.1) | English(13.3) | American(8.1) | Polish(4.3) |
| Melrose Park | Cook County | Italian(12.2) | German(4.1) | Polish(3.2) | Irish(2.8) | American(0.8) |
| Melvin | Ford County | German(42.1) | American(15.4) | Irish(11.2) | English(10.5) | Polish(7.3) |
| Mendon | Adams County | German(35.2) | Irish(17.8) | American(12.6) | English(5.1) | Swedish(2.0) |
| Mendota | LaSalle County | German(33.8) | Irish(13.9) | English(7.2) | American(4.6) | Norwegian(3.7) |
| Menominee | Jo Daviess County | German(69.5) | Irish(33.0) | English(9.0) | American(5.5) | Polish(4.0) |
| Meredosia | Morgan County | American(29.3) | German(28.7) | Irish(17.5) | English(11.5) | Dutch(3.7) |
| Merrionette Park | Cook County | Irish(40.7) | German(26.7) | Polish(13.8) | Italian(11.4) | English(6.4) |
| Metamora | Woodford County | German(53.8) | Irish(14.0) | American(8.2) | English(8.2) | Italian(6.4) |
| Metcalf | Edgar County | American(28.6) | German(10.2) | Irish(10.2) | English(3.1) | French(2.6) |
| Metropolis | Massac County | German(21.6) | Irish(11.8) | English(5.7) | American(5.0) | Italian(3.5) |
| Mettawa | Lake County | Irish(26.1) | German(21.3) | English(11.4) | American(7.8) | Italian(7.6) |
| Michael | Calhoun County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Middletown | Logan County | American(36.3) | German(20.4) | Irish(8.1) | Italian(7.0) | English(6.7) |
| Midlothian | Cook County | Irish(24.7) | German(19.4) | Polish(14.7) | Italian(10.7) | English(4.1) |
| Milan | Rock Island County | German(25.2) | Irish(14.7) | English(10.3) | American(9.1) | Swedish(4.3) |
| Milford | Iroquois County | German(36.2) | American(15.6) | English(13.1) | Irish(7.3) | French(6.9) |
| Mill Creek | Union County | German(8.8) | Irish(7.5) | Norwegian(1.3) | (n/a) | (n/a) |
| Mill Shoals | White County | German(25.3) | Irish(21.2) | American(20.3) | English(10.1) | Scottish(2.3) |
| Millbrook | Kendall County | German(42.4) | Irish(11.4) | Polish(10.7) | Norwegian(9.2) | English(7.4) |
| Millcreek | Union County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Milledgeville | Carroll County | German(39.6) | Irish(17.7) | American(15.9) | English(11.8) | Dutch(5.0) |
| Miller City | Alexander County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Millington | LaSalle County | German(44.3) | Irish(17.8) | Polish(12.0) | English(11.8) | Scotch-Irish(6.1) |
| Millstadt | Saint Clair County | German(55.4) | Irish(14.4) | Italian(9.1) | French(7.9) | American(5.2) |
| Milmine | Piatt County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Milton | Pike County | German(24.9) | Irish(12.2) | American(11.5) | English(8.2) | French(3.8) |
| Mineral | Bureau County | Belgian(20.3) | German(18.2) | English(15.5) | American(10.8) | Irish(10.8) |
| Minier | Tazewell County | German(39.8) | Irish(15.2) | American(12.6) | English(11.9) | Dutch(3.9) |
| Minonk | Woodford County | German(48.8) | Irish(13.0) | American(8.3) | English(6.5) | Polish(5.2) |
| Minooka | Grundy County | German(30.3) | Irish(20.7) | Polish(15.6) | Italian(14.5) | English(9.1) |
| Mitchell | Madison County | American(20.2) | German(10.1) | English(8.9) | Dutch(5.3) | Scotch-Irish(5.2) |
| Mode | Shelby County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Modesto | Macoupin County | American(42.8) | German(24.6) | Irish(12.9) | English(8.7) | Norwegian(2.3) |
| Modoc | Randolph County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Mokena | Will County | Irish(29.3) | German(26.9) | Polish(18.4) | Italian(15.1) | English(5.6) |
| Moline | Rock Island County | German(25.2) | Irish(13.9) | English(9.9) | Swedish(6.6) | Belgian(4.9) |
| Momence | Kankakee County | German(20.6) | Irish(17.6) | Italian(6.5) | English(6.2) | Dutch(6.2) |
| Monee | Will County | German(27.9) | Irish(20.0) | Polish(17.6) | English(8.8) | Italian(7.9) |
| Monmouth | Warren County | German(18.7) | Irish(13.5) | English(8.7) | American(6.2) | Swedish(5.4) |
| Monroe Center | Ogle County | German(23.0) | Irish(14.1) | American(12.4) | English(10.4) | Norwegian(8.3) |
| Montgomery | Kendall County | German(21.0) | Irish(10.5) | Polish(6.9) | Italian(6.1) | English(5.8) |
| Monticello | Piatt County | German(27.6) | Irish(16.6) | English(14.8) | American(13.1) | Polish(4.4) |
| Montrose | Effingham County | English(23.9) | German(16.3) | American(11.5) | Irish(6.2) | Dutch(4.3) |
| Mooseheart | Kane County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Moro | Madison County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Morris | Grundy County | German(29.4) | Irish(19.2) | Norwegian(12.4) | Italian(9.1) | Polish(7.3) |
| Morrison | Whiteside County | German(33.7) | Dutch(18.2) | Irish(16.6) | English(9.1) | American(8.0) |
| Morrisonville | Christian County | German(19.3) | Irish(16.0) | American(13.0) | English(6.5) | Dutch(4.7) |
| Morton | Tazewell County | German(44.0) | English(14.0) | Irish(13.5) | American(9.3) | Italian(4.9) |
| Morton Grove | Cook County | German(13.2) | Polish(10.0) | Irish(8.4) | Italian(6.0) | Russian(4.2) |
| Mossville | Peoria County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Mound City | Pulaski County | German(10.6) | English(6.7) | Irish(6.7) | American(5.8) | French(2.4) |
| Mound Station | Brown County | German(24.2) | American(13.7) | English(6.3) | European(4.2) | Irish(2.1) |
| Mounds | Pulaski County | German(7.4) | American(4.8) | Nigerian(2.2) | African(1.7) | Irish(1.4) |
| Mount Auburn | Christian County | German(14.4) | American(12.0) | Irish(9.6) | English(5.5) | Italian(3.5) |
| Mount Carmel | Wabash County | German(21.4) | English(13.0) | American(11.2) | Irish(9.7) | Dutch(2.4) |
| Mount Carroll | Carroll County | German(48.7) | Irish(14.1) | American(10.4) | English(7.2) | Swedish(4.0) |
| Mount Clare | Macoupin County | German(35.1) | Irish(17.3) | American(13.4) | Italian(12.8) | French(12.1) |
| Mount Erie | Wayne County | English(13.3) | German(6.3) | American(5.5) | French(3.1) | Norwegian(1.6) |
| Mount Morris | Ogle County | German(37.2) | Irish(19.4) | American(7.5) | English(6.3) | Italian(5.5) |
| Mount Olive | Macoupin County | German(37.8) | Irish(13.8) | American(9.2) | Italian(7.2) | English(6.2) |
| Mount Prospect | Cook County | German(20.9) | Polish(18.2) | Irish(12.5) | Italian(9.5) | English(4.1) |
| Mount Pulaski | Logan County | German(35.4) | Irish(17.6) | American(16.6) | English(9.7) | New Zealander(1.8) |
| Mount Sterling | Brown County | German(27.5) | American(24.1) | Irish(14.1) | English(7.0) | Norwegian(2.7) |
| Mount Vernon | Jefferson County | German(25.2) | English(15.6) | Irish(13.1) | American(10.9) | French(3.1) |
| Mount Zion | Macon County | American(28.6) | German(22.2) | Irish(9.2) | English(8.9) | Italian(4.5) |
| Moweaqua | Shelby County | German(24.4) | American(14.7) | Irish(11.7) | English(10.0) | Polish(2.7) |
| Mozier | Calhoun County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Muddy | Saline County | American(18.9) | German(18.9) | Irish(18.9) | Italian(10.8) | English(8.1) |
| Mulberry Grove | Bond County | German(19.5) | English(13.2) | American(9.6) | Irish(8.5) | Polish(3.2) |
| Mulkeytown | Franklin County | German(37.6) | French(25.7) | American(15.8) | Polish(10.9) | Italian(8.9) |
| Muncie | Vermilion County | Irish(30.0) | German(26.7) | English(12.2) | French(12.2) | American(10.0) |
| Mundelein | Lake County | German(19.2) | Polish(9.6) | Irish(9.5) | American(7.0) | Italian(5.6) |
| Murdock | Douglas County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Murphysboro | Jackson County | German(24.8) | Irish(10.8) | American(10.4) | English(7.0) | Italian(6.8) |
| Murrayville | Morgan County | American(33.2) | German(14.8) | Irish(13.3) | English(11.9) | Dutch(5.4) |
| Nachusa | Lee County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Naperville | DuPage County | German(22.2) | Irish(16.6) | Italian(10.4) | Polish(10.0) | English(7.6) |
| Naplate | LaSalle County | Irish(32.6) | German(32.6) | Italian(27.3) | Polish(8.1) | American(6.7) |
| Naples | Scott County | American(22.4) | German(20.4) | Polish(16.3) | Scotch-Irish(14.3) | Irish(10.2) |
| Nashville | Washington County | German(50.1) | Irish(13.4) | English(11.5) | Polish(11.1) | American(5.1) |
| Nason | Jefferson County | Irish(21.5) | American(15.7) | German(15.7) | English(14.1) | Croatian(6.3) |
| Nauvoo | Hancock County | German(30.3) | English(23.0) | American(9.2) | Irish(7.5) | French(3.8) |
| Nebo | Pike County | German(12.3) | American(11.1) | Irish(6.6) | Scottish(5.8) | English(4.4) |
| Nelson | Lee County | German(54.6) | American(22.3) | Irish(13.8) | Dutch(12.4) | English(4.6) |
| Neoga | Cumberland County | German(36.1) | Irish(15.7) | English(12.1) | American(9.2) | Dutch(4.8) |
| Neponset | Bureau County | German(26.3) | English(25.2) | Swedish(11.7) | Irish(11.5) | American(9.4) |
| New Athens | Saint Clair County | German(62.1) | Irish(15.9) | English(8.7) | American(7.3) | French(3.8) |
| New Baden | Clinton County | German(42.7) | English(13.8) | Irish(7.1) | American(3.3) | Italian(3.1) |
| New Bedford | Bureau County | German(32.9) | Scottish(31.5) | American(9.6) | French(8.2) | Swedish(6.8) |
| New Berlin | Sangamon County | German(28.6) | Irish(16.5) | English(11.2) | Italian(9.4) | American(7.3) |
| New Boston | Mercer County | German(20.5) | Irish(12.2) | English(8.9) | American(8.2) | Swedish(5.8) |
| New Burnside | Johnson County | German(19.0) | American(16.3) | English(15.0) | Norwegian(6.8) | Irish(6.1) |
| New Canton | Pike County | German(25.3) | Irish(11.8) | English(9.9) | American(5.5) | Scottish(4.4) |
| New Douglas | Madison County | German(39.3) | Irish(19.6) | English(13.8) | Polish(11.1) | French(10.9) |
| New Grand Chain | Pulaski County | German(43.6) | Irish(18.1) | American(7.5) | English(3.5) | Norwegian(3.1) |
| New Haven | Gallatin County | Irish(22.1) | English(19.4) | German(19.0) | French(7.2) | Polish(6.3) |
| New Holland | Logan County | German(30.7) | American(24.6) | English(14.1) | Irish(11.6) | Dutch(7.5) |
| New Lenox | Will County | Irish(27.8) | German(27.4) | Polish(18.8) | Italian(18.0) | English(7.9) |
| New Memphis | Clinton County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| New Milford | Winnebago County | German(16.2) | Irish(10.1) | English(9.9) | Finnish(9.0) | American(5.9) |
| New Minden | Washington County | German(58.7) | Polish(10.8) | English(9.6) | American(6.6) | Irish(5.4) |
| New Salem | Pike County | Irish(21.8) | German(21.8) | American(15.5) | English(14.8) | Italian(4.2) |
| New Windsor | Mercer County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Newark | Kendall County | German(29.1) | Norwegian(18.3) | Irish(18.0) | English(11.7) | Polish(8.2) |
| Newman | Douglas County | German(21.4) | Irish(16.4) | American(13.1) | English(12.4) | Dutch(3.5) |
| Newton | Jasper County | German(28.6) | English(10.7) | American(9.2) | Irish(7.8) | Italian(5.2) |
| Niantic | Macon County | American(25.2) | German(21.8) | Irish(17.2) | English(12.8) | Polish(4.1) |
| Niles | Cook County | Polish(21.0) | German(11.3) | Irish(7.0) | Italian(6.7) | Greek(4.0) |
| Nilwood | Macoupin County | German(25.6) | English(15.6) | American(15.2) | Scottish(4.3) | Irish(4.3) |
| Niota | Hancock County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Noble | Richland County | German(19.9) | American(11.7) | Irish(9.8) | English(5.1) | Dutch(1.9) |
| Nokomis | Montgomery County | German(30.1) | Irish(11.4) | English(7.2) | American(7.1) | French(4.9) |
| Nora | Jo Daviess County | German(47.1) | Norwegian(18.4) | Irish(17.2) | Swedish(13.8) | Czech(8.0) |
| Normal | McLean County | German(27.8) | Irish(15.9) | English(9.8) | American(9.6) | Italian(5.1) |
| Norridge | Cook County | Polish(37.8) | Italian(21.0) | German(14.1) | Irish(8.2) | Greek(3.9) |
| Norris | Fulton County | American(25.4) | Irish(16.2) | English(15.8) | Italian(14.2) | German(10.0) |
| Norris City | White County | German(36.3) | Irish(26.3) | English(15.3) | American(5.0) | Dutch(4.7) |
| North Aurora | Kane County | German(26.8) | Irish(13.2) | Polish(8.5) | Italian(7.5) | English(7.0) |
| North Barrington | Lake County | German(20.0) | Irish(18.9) | English(13.8) | Italian(12.1) | Polish(11.1) |
| North Chicago | Lake County | German(9.0) | Irish(8.9) | Italian(3.9) | Polish(2.8) | English(2.6) |
| North City | Franklin County | German(23.0) | English(17.3) | American(15.5) | Irish(10.6) | Italian(10.3) |
| North Henderson | Mercer County | German(27.8) | Irish(18.2) | Swedish(15.3) | English(9.1) | American(6.2) |
| North Pekin | Tazewell County | German(38.2) | American(15.6) | Irish(11.1) | English(5.2) | Italian(5.1) |
| North Riverside | Cook County | German(16.5) | Polish(15.2) | Irish(13.7) | Italian(13.3) | Czech(9.1) |
| North Utica | LaSalle County | German(38.5) | Polish(15.8) | Irish(10.6) | English(10.2) | Italian(9.4) |
| Northbrook | Cook County | German(16.9) | Irish(11.3) | Russian(11.1) | Polish(9.3) | American(6.6) |
| Northfield | Cook County | German(25.2) | Irish(24.1) | English(11.6) | Polish(9.1) | Italian(7.1) |
| Northlake | Cook County | Polish(9.9) | Italian(9.1) | German(8.1) | Irish(7.9) | English(2.4) |
| Norwood | Peoria County | American(22.1) | German(21.1) | English(10.6) | Irish(8.1) | French(5.2) |
| Oak Brook | DuPage County | Italian(17.9) | German(13.6) | Irish(9.7) | English(7.4) | Polish(5.6) |
| Oak Forest | Cook County | German(24.4) | Irish(24.3) | Polish(14.8) | Italian(13.0) | Dutch(3.7) |
| Oak Grove | Rock Island County | Irish(20.9) | German(19.7) | American(9.6) | English(4.7) | Italian(3.9) |
| Oak Lawn | Cook County | Irish(24.9) | Polish(19.8) | German(17.8) | Italian(10.2) | Lithuanian(4.0) |
| Oak Park | Cook County | German(18.6) | Irish(18.4) | English(9.4) | Italian(8.2) | Polish(7.6) |
| Oak Run | Knox County | German(39.8) | Irish(21.3) | English(13.7) | Dutch(9.6) | Swedish(5.0) |
| Oakbrook Terrace | DuPage County | German(25.4) | Irish(18.2) | Italian(14.3) | Polish(9.4) | English(6.3) |
| Oakdale | Washington County | German(44.5) | Irish(13.6) | American(10.7) | Polish(9.6) | English(7.4) |
| Oakford | Menard County | American(39.4) | German(21.5) | English(20.5) | Irish(18.9) | Dutch(6.7) |
| Oakland | Coles County | German(21.0) | English(18.6) | Irish(14.3) | American(11.8) | European(2.8) |
| Oakwood | Vermilion County | American(44.7) | German(15.9) | Irish(9.3) | English(8.9) | Welsh(3.4) |
| Oakwood Hills | McHenry County | German(42.9) | Irish(18.9) | Polish(17.5) | Italian(13.2) | Swedish(7.3) |
| Oblong | Crawford County | German(21.1) | American(10.8) | English(9.8) | Irish(8.0) | Scotch-Irish(3.4) |
| Oconee | Shelby County | German(29.7) | American(14.5) | Croatian(4.1) | Irish(2.9) | English(1.7) |
| Odell | Livingston County | German(44.4) | Irish(18.7) | American(11.0) | English(8.8) | French(4.9) |
| Odin | Marion County | German(27.6) | Irish(11.0) | English(8.7) | Italian(8.6) | American(8.4) |
| O'Fallon | Saint Clair County | German(31.5) | Irish(14.3) | English(12.6) | American(5.0) | Polish(4.3) |
| Ogden | Champaign County | German(35.1) | American(29.4) | Irish(12.9) | English(9.5) | Dutch(7.2) |
| Oglesby | LaSalle County | German(30.0) | Polish(20.8) | Italian(20.2) | Irish(12.6) | English(10.7) |
| Ohio | Bureau County | German(37.9) | Irish(23.0) | American(11.6) | Polish(10.1) | English(5.4) |
| Ohlman | Montgomery County | German(34.0) | Irish(14.4) | American(14.4) | English(9.3) | Pennsylvania German(3.1) |
| Okawville | Washington County | German(57.9) | Irish(15.1) | American(6.3) | Polish(4.3) | English(3.6) |
| Old Mill Creek | Lake County | German(28.5) | Irish(14.6) | European(9.0) | Norwegian(9.0) | Dutch(7.6) |
| Old Ripley | Bond County | American(29.5) | German(29.5) | Irish(12.4) | Pennsylvania German(5.7) | French(3.8) |
| Old Shawneetown | Gallatin County | German(23.0) | Irish(22.0) | English(18.0) | American(10.0) | French(2.5) |
| Olive Branch | Alexander County | German(22.2) | French(9.6) | Italian(9.5) | Irish(8.9) | American(8.2) |
| Olivet | Vermilion County | American(53.3) | German(13.8) | Lithuanian(8.1) | Irish(7.0) | Scottish(3.9) |
| Olmsted | Pulaski County | English(17.1) | Irish(15.0) | German(8.3) | American(8.1) | French(5.8) |
| Olney | Richland County | German(23.9) | English(10.5) | Irish(9.6) | American(8.5) | Dutch(2.2) |
| Olympia Fields | Cook County | German(7.1) | Irish(6.6) | Italian(3.8) | English(3.3) | Polish(1.9) |
| Omaha | Gallatin County | Irish(24.8) | German(22.7) | American(17.8) | English(11.2) | French(8.3) |
| Onarga | Iroquois County | German(20.7) | English(10.3) | Irish(9.7) | American(7.6) | French(2.8) |
| Oneida | Knox County | Irish(24.4) | German(19.9) | Swedish(19.1) | American(13.8) | English(6.8) |
| Opdyke | Jefferson County | German(46.8) | Irish(25.2) | English(8.7) | Dutch(7.3) | French(5.6) |
| Opheim | Henry County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Oquawka | Henderson County | German(16.3) | Irish(12.5) | English(8.5) | Swedish(6.8) | Dutch(4.2) |
| Orangeville | Stephenson County | German(60.2) | Irish(15.2) | Norwegian(12.0) | Swiss(11.1) | American(7.9) |
| Oreana | Macon County | German(26.2) | American(21.9) | Irish(12.1) | English(10.1) | Scottish(4.9) |
| Oregon | Ogle County | German(39.9) | Irish(9.8) | English(8.7) | Italian(7.4) | American(5.7) |
| Orient | Franklin County | German(28.2) | English(24.9) | Irish(24.6) | Italian(5.9) | American(5.6) |
| Orion | Henry County | German(32.5) | Swedish(18.0) | Irish(16.9) | English(8.2) | Belgian(8.1) |
| Orland Hills | Cook County | Irish(26.8) | German(19.3) | Polish(19.0) | Italian(13.3) | Arab(5.7) |
| Orland Park | Cook County | Irish(23.9) | German(18.4) | Polish(17.1) | Italian(14.4) | English(4.4) |
| Osco | Henry County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Oswego | Kendall County | German(28.5) | Irish(20.3) | Italian(12.2) | Polish(9.7) | English(8.3) |
| Ottawa | LaSalle County | German(29.8) | Irish(23.6) | English(10.2) | Italian(9.8) | Norwegian(7.2) |
| Otterville | Jersey County | German(31.9) | English(16.0) | Irish(16.0) | American(8.5) | Finnish(2.1) |
| Owaneco | Christian County | German(32.5) | American(17.2) | English(10.8) | Irish(9.6) | Dutch(7.6) |
| Ozark | Johnson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Paderborn | Saint Clair County | German(100.0) | Irish(42.5) | (n/a) | (n/a) | (n/a) |
| Palatine | Cook County | German(21.0) | Irish(14.6) | Polish(14.0) | Italian(9.9) | English(5.6) |
| Palestine | Crawford County | German(23.3) | American(19.7) | Irish(17.6) | English(8.5) | Dutch(2.4) |
| Palmer | Christian County | German(13.7) | English(8.8) | Irish(8.0) | American(7.1) | Italian(5.8) |
| Palmyra | Macoupin County | German(23.1) | American(19.0) | English(14.5) | Irish(9.4) | Dutch(3.3) |
| Paloma | Adams County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Palos Heights | Cook County | Irish(28.7) | German(22.8) | Polish(15.5) | Italian(10.6) | Lithuanian(5.2) |
| Palos Hills | Cook County | Polish(21.0) | German(13.9) | Irish(13.3) | Italian(9.7) | Arab(8.4) |
| Palos Park | Cook County | Irish(23.1) | German(19.2) | Polish(17.1) | Italian(12.0) | Lithuanian(8.7) |
| Pana | Christian County | German(20.9) | American(9.1) | Irish(9.0) | English(7.4) | Italian(3.3) |
| Panama | Montgomery County | German(15.0) | Irish(7.2) | English(6.1) | Italian(5.0) | American(2.2) |
| Panola | Woodford County | German(80.4) | English(13.7) | Irish(7.8) | Swedish(3.9) | Scottish(3.9) |
| Papineau | Iroquois County | American(48.3) | French(17.7) | German(17.2) | Dutch(9.1) | Irish(6.9) |
| Paris | Edgar County | German(18.9) | American(14.1) | Irish(13.7) | English(9.2) | Scottish(3.1) |
| Park City | Lake County | German(7.7) | Irish(3.3) | Polish(2.3) | Italian(2.0) | American(2.0) |
| Park Forest | Cook County | German(9.4) | Irish(7.3) | English(4.4) | Italian(3.0) | Polish(2.5) |
| Park Ridge | Cook County | Irish(22.3) | German(22.2) | Polish(20.3) | Italian(14.2) | English(6.3) |
| Parkersburg | Richland County | German(11.2) | American(10.8) | Irish(10.0) | English(7.2) | Italian(2.4) |
| Patoka | Marion County | German(18.4) | English(18.1) | Irish(14.0) | American(12.9) | French(4.2) |
| Patterson | Greene County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Paw Paw | Lee County | German(43.6) | Irish(14.0) | English(8.6) | Italian(7.1) | Scottish(7.0) |
| Pawnee | Sangamon County | German(29.2) | English(14.4) | Irish(13.5) | American(10.3) | Italian(6.7) |
| Paxton | Ford County | German(28.8) | American(21.2) | Irish(14.6) | English(7.7) | Swedish(5.1) |
| Payson | Adams County | German(43.4) | American(10.9) | Irish(9.6) | English(7.2) | Polish(5.7) |
| Pearl | Pike County | German(16.9) | Scottish(15.7) | Irish(11.8) | Arab(11.2) | English(8.4) |
| Pearl City | Stephenson County | German(53.6) | Irish(9.8) | American(7.5) | Swedish(4.4) | European(2.8) |
| Pecatonica | Winnebago County | German(41.0) | American(16.0) | Irish(14.4) | Swedish(10.5) | English(8.6) |
| Pekin | Tazewell County | German(29.9) | Irish(15.1) | American(14.6) | English(10.3) | Italian(5.3) |
| Penfield | Champaign County | German(30.8) | American(22.4) | English(19.2) | Irish(5.1) | French(1.9) |
| Peoria | Peoria County | German(22.6) | Irish(12.2) | English(8.1) | American(4.2) | Italian(3.7) |
| Peoria Heights | Peoria County | German(33.8) | Irish(17.8) | English(9.3) | American(7.2) | French(5.7) |
| Peotone | Will County | German(35.3) | Irish(18.1) | Polish(15.3) | English(12.4) | Italian(10.6) |
| Percy | Randolph County | German(28.1) | English(20.1) | Irish(13.1) | American(4.3) | French(3.8) |
| Perry | Pike County | English(28.6) | German(27.9) | American(6.4) | Irish(5.9) | Swedish(2.2) |
| Peru | LaSalle County | German(31.1) | Polish(19.8) | Italian(18.1) | Irish(14.4) | English(7.6) |
| Pesotum | Champaign County | German(37.6) | English(14.7) | American(13.8) | Irish(11.4) | French(5.0) |
| Petersburg | Menard County | German(29.5) | American(28.2) | English(12.7) | Irish(11.7) | Scottish(3.0) |
| Phillipstown | White County | German(72.5) | Irish(63.8) | American(7.2) | Dutch(4.3) | English(4.3) |
| Philo | Champaign County | German(33.1) | American(24.2) | Irish(14.7) | English(8.9) | European(3.1) |
| Phoenix | Cook County | Italian(2.4) | African(1.5) | Jamaican(1.3) | Canadian(1.1) | German(1.0) |
| Piasa | Macoupin County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Pierron | Bond County | German(41.2) | Irish(9.2) | Dutch(5.7) | French(5.5) | Polish(5.1) |
| Pinckneyville | Perry County | German(28.3) | Irish(15.1) | American(8.6) | English(4.9) | Polish(4.7) |
| Pingree Grove | Kane County | Polish(25.2) | German(17.7) | English(11.6) | Irish(10.6) | Swedish(5.8) |
| Piper City | Ford County | German(39.9) | Irish(27.5) | American(11.9) | English(9.4) | Lithuanian(5.3) |
| Pistakee Highlands | McHenry County | German(36.1) | Irish(20.0) | Polish(15.5) | Italian(11.3) | English(9.3) |
| Pittsburg | Williamson County | German(27.7) | Irish(15.1) | English(8.5) | American(8.4) | French(5.9) |
| Pittsfield | Pike County | German(24.9) | American(20.3) | English(12.4) | Irish(11.9) | Italian(2.9) |
| Plainfield | Will County | Irish(22.9) | German(21.7) | Italian(15.1) | Polish(12.0) | English(6.0) |
| Plainville | Adams County | German(25.7) | Irish(14.3) | American(12.6) | Italian(9.7) | Dutch(4.6) |
| Plano | Kendall County | German(19.1) | Irish(18.0) | Italian(9.6) | Polish(7.1) | English(6.1) |
| Plattville | Kendall County | German(36.5) | Irish(26.2) | English(20.6) | Norwegian(7.3) | Italian(6.4) |
| Pleasant Hill | Pike County | German(23.0) | American(17.4) | Irish(9.9) | English(9.0) | Scottish(5.3) |
| Pleasant Plains | Sangamon County | German(30.1) | Irish(15.1) | American(12.0) | English(8.8) | Italian(4.3) |
| Plymouth | Hancock County | German(27.3) | American(21.0) | English(18.1) | Irish(8.7) | Lebanese(3.5) |
| Pocahontas | Bond County | German(14.1) | Irish(6.3) | English(4.5) | French(3.4) | Swedish(1.4) |
| Polo | Ogle County | German(33.1) | Irish(14.6) | American(12.2) | English(8.7) | Swedish(4.0) |
| Pomona | Jackson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Pontiac | Livingston County | German(27.4) | Irish(16.8) | American(10.7) | English(7.6) | Italian(5.3) |
| Pontoon Beach | Madison County | German(22.5) | Irish(14.6) | English(8.8) | American(7.5) | Dutch(4.1) |
| Pontoosuc | Hancock County | German(29.1) | Irish(10.7) | English(10.7) | Swedish(6.8) | American(5.8) |
| Poplar Grove | Boone County | German(24.2) | Irish(18.4) | Italian(11.3) | American(11.0) | English(6.1) |
| Port Barrington | McHenry County | German(29.2) | Italian(19.0) | Irish(17.2) | Polish(16.6) | Swedish(6.1) |
| Port Byron | Rock Island County | German(27.1) | English(17.8) | Irish(11.7) | Swedish(8.7) | American(6.7) |
| Posen | Cook County | Polish(7.2) | Irish(6.3) | German(6.2) | Nigerian(3.0) | American(2.2) |
| Potomac | Vermilion County | American(35.3) | German(15.0) | Irish(10.3) | English(6.1) | Polish(3.4) |
| Prairie City | McDonough County | German(22.3) | Irish(12.0) | American(11.6) | English(7.0) | Italian(7.0) |
| Prairie du Rocher | Randolph County | German(54.3) | French(17.2) | American(13.9) | Irish(13.3) | English(7.6) |
| Prairie Grove | McHenry County | German(36.6) | Irish(19.7) | English(13.3) | Italian(12.0) | Polish(11.1) |
| Preemption | Mercer County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Prestbury | Kane County | German(37.7) | Irish(15.1) | Polish(14.9) | English(13.7) | French(8.1) |
| Preston Heights | Will County | German(5.3) | American(3.7) | Irish(3.6) | Polish(2.0) | Italian(1.8) |
| Princeton | Bureau County | German(34.1) | Irish(14.3) | Swedish(11.1) | English(11.0) | American(8.0) |
| Princeville | Peoria County | German(42.8) | Irish(16.0) | English(8.2) | American(6.2) | Swedish(3.6) |
| Prophetstown | Whiteside County | German(34.6) | Irish(16.7) | English(11.7) | American(10.3) | Dutch(7.5) |
| Prospect Heights | Cook County | Polish(19.1) | German(12.1) | Irish(8.6) | Italian(4.9) | English(4.0) |
| Pulaski | Pulaski County | German(12.9) | African(10.7) | Irish(5.4) | Dutch(3.1) | American(3.1) |
| Putnam | Putnam County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Quincy | Adams County | German(40.1) | Irish(11.8) | American(10.0) | English(9.7) | French(2.1) |
| Radom | Washington County | Polish(58.3) | German(17.5) | Italian(7.6) | Irish(7.1) | English(5.7) |
| Raleigh | Saline County | American(14.3) | Irish(14.3) | German(10.2) | English(9.5) | Polish(3.5) |
| Ramsey | Fayette County | German(26.1) | American(23.9) | Irish(18.5) | Italian(3.7) | English(3.4) |
| Rankin | Vermilion County | German(32.3) | American(16.8) | Irish(16.4) | English(7.8) | Polish(3.0) |
| Ransom | LaSalle County | German(35.6) | Irish(25.9) | English(11.2) | Polish(9.4) | Slovak(5.9) |
| Rantoul | Champaign County | German(18.6) | American(14.8) | Irish(10.3) | English(7.4) | Italian(2.9) |
| Rapids City | Rock Island County | German(30.3) | Irish(17.1) | Swedish(6.5) | English(6.4) | American(4.0) |
| Raritan | Henderson County | German(19.2) | Irish(16.0) | Polish(11.2) | American(10.4) | Dutch(8.0) |
| Raymond | Montgomery County | German(25.9) | English(14.4) | Irish(9.9) | American(3.9) | Italian(3.6) |
| Red Bud | Randolph County | German(49.8) | Irish(13.1) | American(10.6) | French(7.2) | English(5.9) |
| Reddick | Kankakee County | German(43.3) | Irish(37.2) | Italian(11.6) | Dutch(5.1) | Hungarian(4.4) |
| Redmon | Edgar County | English(27.3) | German(18.6) | Irish(9.8) | American(7.7) | Dutch(3.1) |
| Renault | Monroe County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Reynolds | Rock Island County | German(25.8) | Irish(16.4) | English(12.2) | Polish(10.3) | American(9.4) |
| Richmond | McHenry County | German(40.4) | Irish(18.4) | Italian(10.7) | Polish(8.7) | English(7.4) |
| Richton Park | Cook County | German(4.5) | Irish(3.3) | Polish(2.7) | English(1.8) | African(1.1) |
| Richview | Washington County | German(41.0) | English(15.6) | Irish(13.7) | Polish(13.7) | American(6.8) |
| Ridge Farm | Vermilion County | American(25.6) | German(16.7) | Irish(15.7) | English(5.9) | Dutch(3.5) |
| Ridgway | Gallatin County | German(33.8) | Irish(33.2) | English(14.4) | American(7.3) | French(3.5) |
| Ridott | Stephenson County | German(29.9) | Swedish(28.4) | Italian(19.4) | Irish(14.9) | American(10.4) |
| Rinard | Wayne County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Ringwood | McHenry County | German(42.0) | Irish(21.2) | Italian(17.6) | Polish(15.7) | English(7.1) |
| Rio | Knox County | German(21.0) | Swedish(15.7) | Irish(13.8) | English(12.4) | French(7.6) |
| Ripley | Brown County | German(30.5) | American(13.6) | Norwegian(10.2) | Irish(8.5) | Dutch(6.8) |
| River Forest | Cook County | Irish(28.0) | German(24.3) | English(13.2) | Italian(10.3) | Polish(8.0) |
| River Grove | Cook County | Polish(32.8) | Italian(12.1) | German(10.6) | Irish(8.4) | American(2.2) |
| Riverdale | Cook County | African(1.0) | Polish(0.8) | Irish(0.8) | English(0.8) | German(0.8) |
| Riverside | Cook County | German(22.1) | Irish(21.0) | Polish(15.1) | Italian(14.4) | Czech(11.1) |
| Riverton | Sangamon County | German(33.6) | Irish(15.3) | Italian(11.1) | American(10.4) | English(7.4) |
| Riverwoods | Lake County | Russian(14.9) | German(13.9) | Polish(13.3) | Irish(9.2) | American(8.0) |
| Roanoke | Woodford County | German(58.5) | Irish(8.6) | Swiss(8.3) | Italian(6.7) | American(6.2) |
| Robbins | Cook County | Liberian(2.2) | West Indian(1.8) | English(1.5) | American(1.4) | African(0.8) |
| Roberts | Ford County | German(43.0) | English(17.2) | American(15.3) | French(5.7) | Irish(5.4) |
| Robinson | Crawford County | German(28.4) | American(11.7) | Irish(11.4) | English(8.8) | Dutch(2.6) |
| Rochelle | Ogle County | German(30.7) | Irish(12.8) | American(9.8) | English(8.0) | Italian(4.5) |
| Rochester | Sangamon County | German(36.7) | English(15.4) | Irish(15.0) | American(9.8) | French(5.2) |
| Rock City | Stephenson County | German(50.0) | Irish(14.6) | Swiss(13.6) | Swedish(12.3) | American(7.3) |
| Rock Falls | Whiteside County | German(26.2) | Irish(13.5) | American(10.0) | English(8.0) | Swedish(4.8) |
| Rock Island | Rock Island County | German(23.5) | Irish(12.7) | English(7.4) | Swedish(5.3) | American(4.7) |
| Rock Island Arsenal | Rock Island County | British(32.3) | Swedish(24.6) | Belgian(3.8) | German(3.1) | Irish(1.5) |
| Rockbridge | Greene County | German(32.7) | Irish(20.6) | Dutch(12.6) | Polish(6.1) | English(6.1) |
| Rockdale | Will County | German(20.6) | Irish(14.2) | Italian(13.9) | Polish(9.5) | Slovene(3.2) |
| Rockford | Winnebago County | German(19.0) | Irish(10.4) | Swedish(7.5) | American(6.8) | Italian(6.5) |
| Rockport | Pike County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Rockton | Winnebago County | German(39.9) | Irish(19.8) | English(10.2) | Italian(8.3) | Norwegian(7.6) |
| Rockwood | Randolph County | German(47.0) | Irish(34.9) | Dutch(18.1) | French(6.0) | American(3.6) |
| Rolling Meadows | Cook County | German(20.4) | Polish(13.8) | Irish(11.3) | Italian(10.3) | English(4.6) |
| Rome | Peoria County | German(26.3) | Irish(23.0) | English(12.3) | American(7.2) | Scottish(3.4) |
| Romeoville | Will County | German(13.4) | Irish(13.2) | Polish(10.9) | Italian(9.6) | English(3.3) |
| Roodhouse | Greene County | German(23.2) | American(17.3) | Irish(12.5) | English(10.7) | French(4.9) |
| Rosamond | Christian County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Roscoe | Winnebago County | German(31.6) | Irish(14.3) | American(13.5) | English(10.4) | Italian(8.4) |
| Rose Hill | Jasper County | German(42.9) | Irish(25.3) | Italian(7.7) | American(6.6) | English(4.4) |
| Roselle | DuPage County | German(23.3) | Italian(17.0) | Polish(16.0) | Irish(15.5) | English(4.8) |
| Rosemont | Cook County | Italian(17.3) | German(13.5) | Polish(12.2) | Irish(10.0) | American(4.1) |
| Roseville | Warren County | German(23.7) | Irish(17.1) | English(14.0) | Swedish(11.2) | American(5.9) |
| Rosewood Heights | Madison County | German(28.4) | Irish(21.4) | American(10.8) | English(9.3) | French(6.9) |
| Rosiclare | Hardin County | Irish(26.0) | German(25.1) | English(13.5) | Scottish(4.3) | Dutch(4.3) |
| Rossville | Vermilion County | German(22.1) | American(21.0) | English(15.4) | Irish(13.4) | Italian(3.3) |
| Round Lake | Lake County | German(17.9) | Irish(11.7) | Polish(9.0) | Italian(6.4) | English(4.9) |
| Round Lake Beach | Lake County | German(14.4) | Irish(9.2) | Polish(8.8) | Italian(3.6) | English(3.3) |
| Round Lake Heights | Lake County | German(19.0) | Polish(13.0) | Irish(12.0) | Italian(6.1) | English(3.8) |
| Round Lake Park | Lake County | German(20.8) | Irish(14.4) | Polish(6.5) | Italian(6.1) | English(4.5) |
| Roxana | Madison County | German(27.6) | Irish(19.1) | American(9.4) | English(7.3) | Polish(5.9) |
| Royal | Champaign County | German(59.5) | Irish(23.0) | American(20.6) | English(8.7) | Italian(4.4) |
| Royal Lakes | Macoupin County | African(31.1) | Irish(5.8) | American(4.4) | English(3.6) | German(2.7) |
| Royalton | Franklin County | English(18.1) | German(14.2) | Irish(12.9) | American(10.0) | Italian(7.8) |
| Ruma | Randolph County | German(64.0) | French(9.1) | Irish(7.4) | English(5.0) | American(4.4) |
| Rushville | Schuyler County | American(22.5) | German(13.1) | Irish(11.5) | English(10.1) | Dutch(3.1) |
| Russellville | Lawrence County | French(17.6) | English(11.8) | German(5.9) | American(5.9) | Swiss(3.9) |
| Rutland | LaSalle County | German(33.8) | Irish(12.9) | Polish(6.0) | French(5.6) | American(5.0) |
| Sadorus | Champaign County | American(48.4) | German(21.1) | Irish(8.7) | English(8.2) | Scottish(2.3) |
| Sailor Springs | Clay County | American(36.3) | Irish(9.7) | Dutch(6.2) | Scottish(2.7) | French(1.8) |
| Saint Anne | Kankakee County | German(26.2) | French(20.1) | Irish(13.6) | Polish(9.1) | English(4.2) |
| Saint Augustine | Knox County | American(19.5) | Irish(16.1) | German(15.3) | Swedish(15.3) | French Canadian(7.6) |
| Saint Charles | Kane County | German(31.4) | Irish(18.9) | Italian(12.4) | English(10.4) | Polish(10.3) |
| Saint David | Fulton County | American(21.5) | German(21.1) | English(17.1) | Irish(12.0) | Italian(9.3) |
| Saint Elmo | Fayette County | German(17.8) | Irish(16.0) | American(15.0) | English(8.8) | Dutch(3.2) |
| Saint Francisville | Lawrence County | German(12.1) | French(4.4) | Irish(3.4) | Italian(2.6) | American(1.8) |
| Saint Jacob | Madison County | German(44.8) | Irish(14.6) | English(12.7) | American(5.5) | Polish(4.5) |
| Saint Johns | Perry County | English(23.8) | German(17.7) | Irish(17.1) | Italian(9.8) | American(9.8) |
| Saint Joseph | Champaign County | German(36.4) | Irish(17.1) | American(17.1) | English(8.9) | French(3.0) |
| Saint Libory | Saint Clair County | German(64.1) | Irish(10.8) | Polish(9.7) | American(3.1) | English(2.7) |
| Saint Peter | Fayette County | German(40.0) | American(10.0) | English(4.7) | Irish(4.0) | French(1.7) |
| Sainte Marie | Jasper County | German(44.7) | Irish(18.7) | American(9.7) | French(8.6) | Scottish(6.2) |
| Salem | Marion County | German(25.4) | Irish(18.5) | English(13.6) | American(11.1) | Dutch(3.7) |
| Sammons Point | Kankakee County | German(29.3) | American(21.1) | French(10.2) | Irish(7.5) | Polish(6.1) |
| San Jose | Mason County | German(32.5) | American(20.8) | Irish(18.0) | English(8.1) | Dutch(4.7) |
| Sandoval | Marion County | German(34.1) | Irish(16.0) | English(12.7) | Italian(4.2) | American(4.2) |
| Sandwich | DeKalb County | German(35.8) | Irish(17.0) | English(9.1) | Norwegian(8.3) | Italian(7.5) |
| Sauget | Saint Clair County | German(19.0) | Italian(17.2) | European(14.5) | English(11.8) | French(10.0) |
| Sauk Village | Cook County | Irish(9.2) | German(7.4) | Polish(5.2) | English(3.0) | Italian(2.4) |
| Saunemin | Livingston County | German(38.0) | Irish(29.8) | English(9.5) | Italian(8.6) | French(8.6) |
| Savanna | Carroll County | German(36.4) | American(12.8) | Irish(12.3) | English(10.8) | Italian(6.2) |
| Savoy | Champaign County | German(19.2) | American(11.8) | English(8.0) | Irish(7.3) | European(5.6) |
| Sawyerville | Macoupin County | German(30.7) | Italian(23.5) | French(13.5) | Scottish(8.8) | American(8.8) |
| Saybrook | McLean County | German(24.9) | American(19.9) | Irish(15.2) | English(6.3) | Scottish(6.1) |
| Scales Mound | Jo Daviess County | German(59.8) | English(11.8) | Irish(11.6) | American(5.0) | Italian(2.6) |
| Schaumburg | Cook County | German(21.1) | Polish(14.6) | Irish(12.8) | Italian(11.1) | English(4.6) |
| Scheller | Jefferson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Schiller Park | Cook County | Polish(27.8) | Italian(10.0) | Irish(6.0) | German(4.8) | Bulgarian(4.0) |
| Schram City | Montgomery County | German(27.0) | Irish(12.9) | English(9.4) | Italian(9.2) | American(4.2) |
| Sciota | McDonough County | English(26.5) | German(18.1) | Irish(12.0) | American(8.4) | European(6.0) |
| Scott AFB | Saint Clair County | German(18.9) | Irish(14.0) | American(5.3) | Polish(4.4) | European(3.8) |
| Scottville | Macoupin County | German(40.0) | Irish(9.2) | American(9.2) | French(6.9) | English(5.4) |
| Seaton | Mercer County | German(24.0) | Swedish(17.9) | English(15.5) | Irish(15.5) | American(3.4) |
| Seatonville | Bureau County | German(40.2) | Italian(22.8) | Irish(15.3) | Polish(12.1) | English(7.1) |
| Secor | Woodford County | German(45.8) | American(17.9) | English(7.5) | French(6.2) | Irish(4.4) |
| Seneca | LaSalle County | German(27.5) | Irish(27.1) | Norwegian(14.1) | English(7.4) | Polish(7.4) |
| Serena | La Salle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Sesser | Franklin County | German(23.2) | Irish(20.0) | English(18.8) | American(10.3) | Italian(4.6) |
| Seward | Winnebago County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Seymour | Champaign County | German(25.4) | English(17.4) | Polish(11.0) | Irish(4.5) | Italian(4.2) |
| Shabbona | DeKalb County | German(41.0) | English(14.9) | Irish(10.4) | Italian(9.0) | Norwegian(7.4) |
| Shannon | Carroll County | German(52.3) | American(14.1) | English(8.8) | Irish(7.8) | Dutch(7.2) |
| Shawneetown | Gallatin County | German(25.3) | Irish(21.5) | Dutch(8.7) | English(8.2) | American(3.1) |
| Sheffield | Bureau County | German(35.4) | Irish(18.4) | American(12.3) | Belgian(9.6) | English(9.5) |
| Shelbyville | Shelby County | German(22.8) | American(14.4) | Irish(9.6) | English(7.0) | French(4.8) |
| Sheldon | Iroquois County | German(24.5) | Irish(16.0) | American(15.8) | English(10.8) | French(4.2) |
| Sheridan | LaSalle County | German(22.1) | Irish(11.8) | Italian(8.9) | English(6.7) | Norwegian(5.0) |
| Sherman | Sangamon County | German(36.7) | Irish(18.7) | English(17.5) | Italian(9.2) | American(6.0) |
| Sherrard | Mercer County | German(29.9) | Irish(21.1) | Swedish(16.2) | English(11.9) | Belgian(7.1) |
| Shiloh | Saint Clair County | German(25.6) | Irish(11.1) | English(8.2) | Italian(4.3) | American(3.9) |
| Shipman | Macoupin County | German(35.8) | Scotch-Irish(12.3) | English(12.1) | Irish(8.8) | American(6.7) |
| Shirland | Winnebago County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Shirley | McLean County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Shobonier | Fayette County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Shorewood | Will County | German(22.6) | Irish(18.8) | Polish(13.0) | Italian(12.7) | English(6.3) |
| Shumway | Effingham County | German(43.3) | Irish(12.7) | American(11.3) | French(2.7) | Polish(2.7) |
| Sibley | Ford County | German(35.6) | American(27.1) | Irish(12.5) | English(8.5) | Swedish(3.8) |
| Sidell | Vermilion County | American(43.6) | German(11.3) | Irish(6.6) | English(5.9) | Lithuanian(1.1) |
| Sidney | Champaign County | German(27.5) | American(22.6) | Irish(22.6) | English(17.4) | Dutch(3.8) |
| Sigel | Shelby County | German(66.9) | Irish(11.4) | American(8.2) | English(7.6) | Polish(0.3) |
| Silvis | Rock Island County | German(23.7) | Irish(11.5) | English(8.2) | Swedish(5.5) | American(5.0) |
| Simpson | Johnson County | Italian(18.4) | English(11.7) | German(2.9) | American(2.9) | (n/a) |
| Sims | Wayne County | English(6.6) | Irish(5.8) | American(5.2) | German(3.2) | Scottish(1.7) |
| Skokie | Cook County | German(8.8) | Russian(6.2) | Irish(5.8) | Polish(5.8) | Assyrian/Chaldean/Syriac(5.6) |
| Sleepy Hollow | Kane County | German(36.3) | Irish(20.3) | Polish(16.2) | Italian(15.3) | English(7.1) |
| Smithboro | Bond County | German(15.7) | Irish(13.4) | Scotch-Irish(8.2) | English(6.7) | Dutch(6.0) |
| Smithfield | Fulton County | American(26.2) | German(24.6) | Irish(21.9) | Ukrainian(13.3) | Italian(7.6) |
| Smithshire | Warren County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Smithton | Saint Clair County | German(41.0) | Irish(10.6) | American(10.0) | English(9.5) | French(9.1) |
| Somonauk | DeKalb County | German(34.3) | Irish(13.2) | Norwegian(8.7) | Polish(7.9) | French(7.7) |
| Sorento | Bond County | English(10.3) | German(9.1) | Irish(5.4) | Scotch-Irish(2.5) | European(2.2) |
| South Barrington | Cook County | German(20.2) | Polish(12.1) | Irish(9.4) | Italian(7.7) | Greek(3.8) |
| South Beloit | Winnebago County | German(27.5) | Irish(16.8) | American(11.9) | Italian(10.8) | Norwegian(8.9) |
| South Chicago Heights | Cook County | German(13.0) | Italian(12.9) | Irish(7.2) | Polish(6.9) | Swedish(3.4) |
| South Elgin | Kane County | German(32.5) | Irish(15.4) | Polish(13.6) | Italian(11.4) | English(6.8) |
| South Holland | Cook County | Dutch(4.5) | Polish(2.9) | German(2.8) | Irish(2.0) | Italian(2.0) |
| South Jacksonville | Morgan County | German(34.4) | English(17.9) | American(15.7) | Irish(15.1) | French(3.0) |
| South Pekin | Tazewell County | German(27.2) | American(20.6) | Irish(17.8) | English(11.7) | Italian(4.2) |
| South Roxana | Madison County | German(30.6) | Irish(17.8) | English(10.5) | American(9.1) | French(5.0) |
| South Wilmington | Grundy County | German(26.1) | Italian(25.8) | Irish(12.5) | English(12.5) | Norwegian(6.5) |
| Southern View | Sangamon County | German(31.1) | Irish(16.7) | English(12.3) | American(9.1) | Hungarian(5.4) |
| Sparland | Marshall County | German(40.7) | Irish(25.7) | English(9.7) | American(5.7) | French(4.2) |
| Sparta | Randolph County | German(30.0) | English(14.5) | Irish(11.9) | Italian(4.4) | American(3.9) |
| Spaulding | Sangamon County | German(43.2) | Irish(19.3) | Italian(11.2) | English(10.1) | American(5.1) |
| Speer | Stark County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Spillertown | Williamson County | Irish(24.2) | German(16.9) | American(14.0) | English(13.0) | French(8.2) |
| Spring Bay | Woodford County | German(41.6) | Irish(19.6) | American(12.2) | English(11.0) | Polish(6.6) |
| Spring Grove | McHenry County | German(36.3) | Irish(23.4) | Polish(22.2) | Italian(16.9) | English(8.8) |
| Spring Valley | Bureau County | German(22.4) | Italian(20.2) | Irish(15.0) | Polish(8.7) | English(8.0) |
| Springerton | White County | Irish(19.1) | American(17.0) | German(16.0) | English(13.8) | Dutch(4.3) |
| Springfield | Sangamon County | German(24.8) | Irish(13.5) | English(10.4) | American(7.3) | Italian(5.9) |
| Standard | Putnam County | German(36.4) | Italian(25.3) | Irish(17.6) | Polish(12.6) | Welsh(6.9) |
| Standard City | Macoupin County | German(42.6) | Italian(19.0) | English(15.9) | American(13.8) | Irish(13.3) |
| Stanford | McLean County | American(24.1) | German(22.9) | Irish(16.5) | English(13.8) | Swedish(2.3) |
| Staunton | Macoupin County | German(45.2) | Italian(20.1) | Irish(15.7) | English(7.0) | American(6.1) |
| Steeleville | Randolph County | German(52.0) | Irish(7.9) | American(6.9) | French(5.1) | Italian(4.8) |
| Steger | Will County | German(17.9) | Italian(14.4) | Irish(13.1) | Polish(10.1) | English(5.4) |
| Sterling | Whiteside County | German(26.4) | Irish(14.8) | English(7.0) | American(6.4) | Italian(3.5) |
| Steward | Lee County | German(42.5) | Irish(18.0) | American(9.5) | English(7.8) | Norwegian(7.5) |
| Stewardson | Shelby County | German(42.2) | English(9.2) | Irish(8.5) | American(7.6) | Swedish(4.1) |
| Stickney | Cook County | Polish(19.3) | Italian(15.6) | German(12.7) | Irish(11.9) | Czech(8.0) |
| Stillman Valley | Ogle County | German(46.0) | Swedish(19.4) | Irish(13.3) | English(9.2) | American(8.1) |
| Stockton | Jo Daviess County | German(47.9) | Irish(15.8) | American(10.8) | English(5.3) | Dutch(4.7) |
| Stone Park | Cook County | Irish(1.9) | German(1.5) | Italian(1.5) | English(0.7) | American(0.6) |
| Stonefort | Williamson County | English(21.6) | German(20.5) | Irish(16.8) | American(6.8) | Welsh(3.1) |
| Stonington | Christian County | German(21.0) | American(12.3) | Irish(10.2) | English(7.5) | Italian(5.0) |
| Stoy | Crawford County | German(55.5) | Dutch(29.1) | Irish(20.0) | English(7.3) | Scottish(6.4) |
| Strasburg | Shelby County | German(44.1) | English(7.8) | American(6.8) | Dutch(4.7) | Irish(4.0) |
| Strawn | Livingston County | Irish(34.4) | American(29.7) | German(21.9) | English(12.5) | Dutch(8.6) |
| Streamwood | Cook County | German(16.3) | Polish(13.2) | Irish(9.4) | Italian(8.2) | English(3.8) |
| Streator | LaSalle County | German(28.9) | Irish(18.3) | Slovak(12.3) | English(6.6) | Italian(6.5) |
| Stronghurst | Henderson County | German(26.1) | English(11.0) | Irish(10.6) | Swedish(6.6) | American(2.6) |
| Sublette | Lee County | German(51.7) | Irish(14.8) | Polish(10.2) | American(9.7) | French(8.4) |
| Sugar Grove | Kane County | German(40.3) | Irish(16.1) | English(10.3) | Polish(10.3) | Italian(7.1) |
| Sullivan | Moultrie County | American(14.6) | German(13.4) | Irish(11.7) | English(9.7) | Scotch-Irish(2.1) |
| Summerfield | Saint Clair County | German(39.3) | Irish(20.3) | English(16.7) | American(11.5) | French(8.8) |
| Summit | Cook County | Polish(7.9) | German(6.0) | Irish(5.3) | Italian(1.8) | English(1.4) |
| Summit Argo | Cook County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Sumner | Lawrence County | German(8.9) | Irish(4.6) | American(3.7) | English(2.2) | Dutch(1.8) |
| Sun River Terrace | Kankakee County | African(1.3) | German(0.8) | Arab(0.5) | American(0.5) | (n/a) |
| Sutter | Hancock County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Swansea | Saint Clair County | German(28.9) | Irish(12.1) | English(10.2) | American(7.4) | European(6.4) |
| Sycamore | DeKalb County | German(34.0) | Irish(19.9) | English(9.5) | Polish(7.8) | Italian(7.4) |
| Symerton | Will County | German(19.4) | Belgian(6.0) | English(6.0) | French(6.0) | French Canadian(6.0) |
| Table Grove | Fulton County | American(28.1) | German(23.1) | Irish(15.8) | English(9.4) | Dutch(5.5) |
| Tallula | Menard County | American(36.1) | German(17.6) | Irish(11.4) | English(7.4) | Dutch(6.0) |
| Tamaroa | Perry County | German(21.0) | Irish(13.5) | English(10.7) | Polish(10.7) | French(6.1) |
| Tamms | Alexander County | German(15.7) | English(8.1) | Irish(6.8) | American(4.4) | Polish(2.6) |
| Tampico | Whiteside County | German(23.0) | American(13.8) | Irish(13.4) | Dutch(9.8) | English(4.8) |
| Taylor Ridge | Rock Island County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Taylor Springs | Montgomery County | American(12.6) | German(12.3) | Irish(9.3) | English(6.4) | Italian(3.5) |
| Taylorville | Christian County | German(18.2) | Irish(15.7) | English(11.5) | American(10.2) | Italian(5.5) |
| Tennessee | McDonough County | Irish(16.3) | German(15.1) | English(11.6) | American(9.3) | Scottish(4.7) |
| Teutopolis | Effingham County | German(62.9) | American(6.9) | Irish(5.5) | English(3.9) | French(1.6) |
| Texico | Jefferson County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Thawville | Iroquois County | German(44.6) | English(10.8) | American(10.2) | French(9.0) | Irish(9.0) |
| Thayer | Sangamon County | German(24.9) | American(11.7) | Irish(10.6) | English(10.5) | Czech(3.6) |
| The Galena Territory | Jo Daviess County | German(36.3) | Irish(15.8) | English(10.9) | Polish(9.5) | Italian(6.7) |
| Thebes | Alexander County | Irish(9.6) | German(8.1) | American(5.2) | English(2.9) | Italian(2.3) |
| Third Lake | Lake County | German(37.4) | Irish(24.1) | Italian(14.8) | Polish(12.4) | English(11.0) |
| Thomasboro | Champaign County | German(39.0) | American(18.9) | Irish(8.0) | English(5.8) | Dutch(2.5) |
| Thompsonville | Franklin County | German(27.3) | English(18.6) | Irish(13.8) | American(8.6) | Scotch-Irish(3.8) |
| Thomson | Carroll County | German(36.1) | Irish(21.9) | American(17.0) | English(7.7) | Dutch(7.1) |
| Thornton | Cook County | German(23.9) | Irish(18.1) | Polish(16.1) | Italian(13.6) | French(4.6) |
| Tilden | Randolph County | German(27.9) | Irish(19.1) | English(13.5) | American(8.3) | Italian(7.9) |
| Tilton | Vermilion County | American(25.2) | German(12.6) | English(7.3) | Irish(5.6) | Polish(2.9) |
| Timberlane | Boone County | German(34.1) | Irish(20.5) | English(13.7) | American(11.6) | Italian(7.9) |
| Time | Pike County | German(38.1) | English(19.0) | Scotch-Irish(9.5) | (n/a) | (n/a) |
| Timewell | Brown County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Tinley Park | Cook County | Irish(26.2) | German(22.0) | Polish(20.4) | Italian(12.4) | English(4.7) |
| Tiskilwa | Bureau County | German(32.5) | Irish(24.4) | English(11.6) | Swedish(10.1) | Norwegian(5.4) |
| Toledo | Cumberland County | German(28.2) | Irish(20.6) | English(9.0) | American(6.3) | Italian(3.1) |
| Tolono | Champaign County | German(33.6) | American(17.0) | Irish(14.9) | English(13.5) | European(8.4) |
| Toluca | Marshall County | German(42.5) | Italian(14.3) | Irish(10.1) | English(8.3) | Polish(6.2) |
| Tonica | LaSalle County | German(38.9) | English(20.6) | Irish(17.1) | Italian(16.6) | Polish(11.9) |
| Topeka | Mason County | Irish(26.8) | German(17.1) | English(14.6) | French(12.2) | American(4.9) |
| Toulon | Stark County | German(32.0) | English(19.1) | Swedish(10.7) | American(10.0) | Irish(10.0) |
| Tovey | Christian County | American(17.3) | Italian(16.9) | German(14.2) | French(11.6) | Irish(8.3) |
| Towanda | McLean County | German(30.5) | American(18.4) | Irish(15.5) | English(13.3) | Italian(6.3) |
| Tower Hill | Shelby County | American(14.1) | Irish(10.9) | German(8.9) | English(5.9) | Scottish(3.1) |
| Tower Lakes | Lake County | German(31.9) | Irish(28.2) | English(12.0) | American(10.6) | Polish(7.2) |
| Tremont | Tazewell County | German(45.0) | American(12.8) | Irish(12.8) | English(11.7) | Swiss(5.0) |
| Trenton | Clinton County | German(48.6) | Irish(14.4) | English(12.7) | American(6.7) | French(5.4) |
| Trilla | Coles County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Trivoli | Peoria County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Trout Valley | McHenry County | German(33.0) | Irish(32.9) | English(12.3) | Polish(9.8) | Italian(9.2) |
| Troy | Madison County | German(31.6) | Irish(13.5) | English(8.1) | American(6.9) | Italian(6.0) |
| Troy Grove | LaSalle County | German(49.5) | Irish(21.6) | Swedish(6.4) | American(5.9) | Norwegian(4.9) |
| Tuscola | Douglas County | German(27.8) | English(16.9) | Irish(12.6) | American(8.4) | Scottish(4.2) |
| Twin Grove | McLean County | German(35.2) | Irish(21.5) | American(9.1) | English(7.0) | Swedish(3.9) |
| Ullin | Pulaski County | German(14.2) | Irish(10.0) | French(4.4) | Dutch(4.4) | American(2.9) |
| Union | McHenry County | German(62.9) | Italian(19.6) | Irish(12.1) | Polish(6.7) | English(6.5) |
| Union Hill | Kankakee County | German(54.0) | French(36.0) | European(10.0) | English(10.0) | Dutch(6.0) |
| University Park | Will County | Italian(2.2) | African(2.1) | Irish(1.3) | German(1.3) | Jamaican(1.2) |
| Urbana | Champaign County | German(16.4) | American(10.5) | Irish(9.0) | English(7.7) | European(4.1) |
| Ursa | Adams County | German(37.4) | American(17.3) | Irish(16.1) | English(6.1) | Scotch-Irish(4.5) |
| Utica | La Salle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Valier | Franklin County | Irish(26.4) | German(25.2) | English(13.1) | Dutch(10.1) | French(8.1) |
| Valmeyer | Monroe County | German(45.3) | Irish(17.0) | American(6.5) | Italian(5.9) | French(4.6) |
| Van Orin | Bureau County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Vandalia | Fayette County | German(25.2) | American(12.8) | English(8.5) | Irish(7.8) | French(3.0) |
| Varna | Marshall County | German(55.3) | Irish(23.3) | English(13.3) | Swedish(12.7) | Italian(11.4) |
| Venedy | Washington County | German(64.8) | Italian(16.7) | Irish(8.3) | Portuguese(3.7) | Scottish(1.9) |
| Venetian Village | Lake County | German(35.7) | Irish(23.7) | Polish(16.2) | Italian(12.7) | English(11.2) |
| Venice | Madison County | African(1.0) | American(0.7) | German(0.6) | Belizean(0.2) | Irish(0.2) |
| Vergennes | Jackson County | German(21.2) | English(11.1) | American(7.3) | Irish(4.3) | Italian(3.5) |
| Vermilion | Edgar County | Irish(19.6) | German(19.1) | American(6.4) | Italian(5.9) | English(5.4) |
| Vermont | Fulton County | American(22.5) | German(19.8) | English(10.8) | Irish(7.8) | French(5.7) |
| Vernon | Marion County | German(20.0) | Irish(16.8) | American(12.0) | Dutch(11.2) | English(10.4) |
| Vernon Hills | Lake County | German(16.0) | Irish(10.3) | Russian(9.3) | Polish(8.4) | American(6.5) |
| Verona | Grundy County | German(38.3) | Irish(15.3) | Swedish(12.2) | Italian(10.7) | Norwegian(10.2) |
| Versailles | Brown County | German(28.9) | Irish(19.2) | American(12.0) | English(7.7) | Polish(3.8) |
| Victoria | Knox County | German(27.2) | Swedish(22.6) | Irish(13.1) | American(13.1) | English(10.1) |
| Vienna | Johnson County | German(23.3) | English(15.9) | Irish(15.4) | American(6.9) | Scotch-Irish(6.0) |
| Villa Grove | Douglas County | German(29.4) | Irish(13.6) | American(11.8) | English(9.2) | Scottish(7.0) |
| Villa Park | DuPage County | German(22.1) | Irish(18.9) | Polish(12.5) | Italian(11.1) | English(6.1) |
| Villa Ridge | Pulaski County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Viola | Mercer County | German(30.3) | Irish(14.4) | English(12.7) | Swedish(7.0) | American(6.4) |
| Virden | Macoupin County | German(27.5) | Irish(17.1) | English(11.4) | American(10.5) | Italian(4.9) |
| Virgil | Kane County | German(44.5) | Swedish(17.3) | Polish(14.1) | Italian(10.9) | American(10.9) |
| Virginia | Cass County | German(29.2) | American(27.5) | Irish(15.6) | English(13.2) | French(1.6) |
| Volo | Lake County | German(26.7) | Irish(16.6) | Polish(16.0) | Italian(14.6) | English(5.8) |
| Wadsworth | Lake County | German(31.2) | Irish(17.2) | English(14.8) | Polish(14.5) | Swedish(6.5) |
| Waggoner | Montgomery County | German(28.0) | Irish(20.8) | American(11.9) | English(6.5) | Polish(4.8) |
| Walnut | Bureau County | German(38.2) | Irish(15.6) | English(8.5) | Swedish(7.4) | Polish(6.8) |
| Walnut Hill | Marion County | German(40.3) | English(6.0) | Irish(4.5) | American(3.0) | Scotch-Irish(1.5) |
| Walsh | Randolph County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Walshville | Montgomery County | American(43.4) | German(17.0) | Slovak(11.3) | Scottish(9.4) | Norwegian(5.7) |
| Waltonville | Jefferson County | German(18.8) | Irish(16.2) | American(13.6) | English(12.4) | Polish(9.0) |
| Wamac | Clinton County | German(19.6) | Irish(15.0) | American(9.3) | English(7.2) | Italian(3.8) |
| Wapella | De Witt County | Irish(26.9) | German(23.9) | American(20.0) | English(10.0) | Italian(5.5) |
| Warren | Jo Daviess County | German(36.2) | Irish(18.6) | English(15.2) | American(12.4) | Norwegian(7.7) |
| Warrensburg | Macon County | German(25.9) | American(23.0) | Irish(19.3) | English(8.8) | Dutch(4.1) |
| Warrenville | DuPage County | German(27.8) | Irish(17.5) | Polish(8.6) | English(8.5) | Italian(7.1) |
| Warsaw | Hancock County | German(39.8) | Irish(14.5) | American(13.2) | English(8.4) | Dutch(4.2) |
| Washburn | Woodford County | German(38.9) | Irish(18.9) | English(14.2) | American(7.9) | Italian(4.4) |
| Washington | Tazewell County | German(36.2) | Irish(16.4) | English(11.9) | American(10.2) | Italian(4.6) |
| Washington Park | Saint Clair County | German(3.0) | Polish(1.4) | Irish(1.2) | American(1.1) | Jamaican(1.0) |
| Wataga | Knox County | German(19.8) | Irish(14.7) | American(11.3) | Swedish(9.3) | English(4.4) |
| Waterloo | Monroe County | German(50.0) | Irish(17.2) | English(10.8) | American(8.9) | French(7.4) |
| Waterman | DeKalb County | German(43.2) | English(12.0) | Irish(11.5) | Norwegian(6.9) | Dutch(6.7) |
| Watseka | Iroquois County | German(29.7) | Irish(16.4) | American(14.3) | English(11.3) | French(8.5) |
| Watson | Effingham County | German(32.5) | Irish(13.6) | English(11.3) | American(7.9) | Italian(7.0) |
| Wauconda | Lake County | German(25.7) | Irish(15.5) | Italian(11.5) | Polish(9.5) | American(7.5) |
| Waukegan | Lake County | German(7.9) | Irish(5.2) | Polish(2.7) | Italian(2.7) | English(2.6) |
| Waverly | Morgan County | American(30.9) | German(26.3) | English(11.1) | Irish(11.0) | French(2.9) |
| Wayne | DuPage County | German(39.4) | Irish(21.1) | Italian(17.7) | English(16.0) | Polish(11.5) |
| Wayne City | Wayne County | German(9.5) | Irish(9.5) | English(7.7) | American(3.3) | Swedish(2.4) |
| Waynesville | De Witt County | American(36.9) | German(27.7) | English(15.5) | Irish(7.2) | Norwegian(2.2) |
| Wedron | La Salle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Weldon | De Witt County | American(26.9) | German(17.2) | English(10.3) | Irish(7.7) | Polish(7.2) |
| Wellington | Iroquois County | German(33.0) | American(18.6) | English(17.7) | Irish(11.2) | Swedish(4.2) |
| Wenona | Marshall County | German(32.6) | Irish(13.2) | English(8.6) | Polish(8.0) | Italian(7.4) |
| Wenonah | Montgomery County | Italian(31.8) | German(9.1) | Irish(9.1) | (n/a) | (n/a) |
| West Brooklyn | Lee County | German(27.3) | Irish(17.5) | French(12.6) | Scotch-Irish(7.0) | American(7.0) |
| West Chicago | DuPage County | German(12.3) | Irish(8.8) | Polish(7.2) | Italian(6.6) | English(3.9) |
| West City | Franklin County | German(25.2) | Irish(19.4) | English(15.4) | Polish(5.1) | Italian(3.9) |
| West Dundee | Kane County | German(34.4) | Irish(22.9) | Polish(12.0) | Italian(9.3) | English(8.9) |
| West Frankfort | Franklin County | German(22.9) | Irish(18.3) | English(13.9) | Italian(7.4) | American(6.9) |
| West Liberty | Jasper County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| West Peoria | Peoria County | German(28.9) | Irish(24.8) | English(9.6) | French(6.9) | American(6.6) |
| West Point | Hancock County | German(31.2) | Irish(19.9) | American(19.9) | English(7.7) | Welsh(2.3) |
| West Salem | Edwards County | German(20.9) | English(18.8) | American(14.6) | Irish(8.5) | Scottish(2.0) |
| West Union | Clark County | German(55.1) | English(14.6) | American(3.0) | Irish(2.7) | (n/a) |
| West York | Crawford County | German(22.2) | Dutch(16.2) | English(6.1) | (n/a) | (n/a) |
| Westchester | Cook County | Irish(14.8) | German(14.5) | Polish(13.6) | Italian(13.6) | Czech(4.4) |
| Western Springs | Cook County | Irish(33.7) | German(26.1) | Italian(13.5) | English(11.7) | Polish(11.3) |
| Westervelt | Shelby County | German(64.6) | Irish(52.5) | (n/a) | (n/a) | (n/a) |
| Westfield | Clark County | German(19.3) | English(18.9) | Irish(18.6) | American(15.1) | Italian(5.2) |
| Westmont | DuPage County | German(19.0) | Irish(13.1) | Polish(12.5) | Italian(8.1) | English(4.8) |
| Westville | Vermilion County | American(26.9) | German(18.2) | Irish(14.9) | Italian(10.6) | English(7.5) |
| Wheaton | DuPage County | German(25.4) | Irish(17.3) | English(12.1) | Italian(11.0) | Polish(10.0) |
| Wheeler | Jasper County | German(26.0) | English(8.1) | American(8.1) | Irish(7.3) | Dutch(4.9) |
| Wheeling | Cook County | German(12.2) | Polish(9.6) | Irish(7.4) | Russian(6.3) | Italian(4.9) |
| White City | Macoupin County | German(52.7) | Irish(28.6) | English(9.5) | French(9.5) | Dutch(6.8) |
| White Hall | Greene County | German(20.1) | American(16.0) | Irish(15.4) | English(14.0) | Polish(2.7) |
| White Heath | Piatt County | German(29.4) | American(22.1) | Irish(16.2) | French(12.8) | Italian(12.3) |
| Whiteash | Williamson County | English(21.3) | Irish(21.3) | German(11.0) | Italian(6.4) | European(3.9) |
| Whittington | Franklin County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Williamsfield | Knox County | German(18.4) | American(16.6) | Swedish(10.0) | English(10.0) | Irish(6.4) |
| Williamson | Madison County | German(25.8) | English(16.0) | Italian(13.9) | American(7.8) | Irish(7.4) |
| Williamsville | Sangamon County | German(32.7) | English(17.7) | American(14.0) | Irish(12.5) | Italian(7.1) |
| Willisville | Perry County | German(42.1) | French(17.6) | Irish(12.4) | American(8.4) | English(5.4) |
| Willow Hill | Jasper County | German(26.6) | Irish(10.3) | English(10.3) | Norwegian(7.9) | Italian(5.6) |
| Willow Springs | Cook County | Polish(22.3) | Irish(17.3) | German(15.9) | Italian(8.9) | Lithuanian(6.1) |
| Willowbrook | DuPage County | German(17.7) | Irish(17.5) | Polish(12.7) | Italian(9.9) | English(5.6) |
| Willowbrook | Will County | German(13.5) | Dutch(9.9) | Polish(8.8) | Irish(5.8) | English(5.6) |
| Wilmette | Cook County | German(23.1) | Irish(17.7) | English(10.5) | Polish(6.6) | Italian(6.4) |
| Wilmington | Greene County | English(36.8) | German(31.0) | Irish(12.9) | Polish(5.8) | Dutch(3.9) |
| Wilmington | Will County | German(27.6) | Irish(27.0) | English(13.6) | Polish(10.2) | Italian(7.8) |
| Wilsonville | Macoupin County | German(39.0) | Irish(24.2) | English(15.9) | Italian(15.3) | American(3.5) |
| Winchester | Scott County | American(31.0) | German(19.7) | English(15.3) | Irish(12.3) | Dutch(2.8) |
| Windsor | Mercer County | German(29.2) | Irish(18.5) | Swedish(16.1) | English(14.8) | American(9.3) |
| Windsor | Shelby County | German(17.7) | American(13.0) | Irish(7.1) | English(6.0) | Dutch(3.8) |
| Winfield | DuPage County | German(31.8) | Irish(18.0) | Italian(12.0) | Polish(11.1) | English(10.8) |
| Winnebago | Winnebago County | German(44.3) | Irish(20.8) | American(11.7) | English(10.3) | Italian(7.5) |
| Winnetka | Cook County | German(27.4) | Irish(22.3) | English(15.2) | Italian(5.4) | Polish(4.8) |
| Winslow | Stephenson County | German(62.8) | Irish(19.7) | Swiss(12.1) | English(8.8) | Norwegian(8.8) |
| Winthrop Harbor | Lake County | German(29.2) | Irish(16.5) | English(11.0) | Polish(10.4) | Italian(7.7) |
| Witt | Montgomery County | German(21.9) | American(10.9) | English(10.5) | Irish(7.7) | Italian(5.0) |
| Wolf Lake | Union County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Wonder Lake | McHenry County | German(28.1) | Polish(16.0) | Irish(15.8) | Italian(9.6) | Swedish(8.3) |
| Wood Dale | DuPage County | Polish(22.1) | German(18.6) | Italian(15.5) | Irish(8.6) | English(3.4) |
| Wood River | Madison County | German(32.5) | Irish(18.9) | English(12.6) | American(8.7) | Italian(6.3) |
| Woodhull | Henry County | Swedish(27.3) | German(23.7) | Irish(19.3) | English(13.3) | American(8.8) |
| Woodland | Iroquois County | German(44.6) | Irish(21.2) | American(20.5) | English(15.1) | French(6.5) |
| Woodlawn | Jefferson County | German(23.5) | Irish(16.0) | English(9.5) | Polish(9.2) | American(8.2) |
| Woodridge | DuPage County | German(19.8) | Irish(12.4) | Polish(11.7) | Italian(11.0) | English(5.2) |
| Woodson | Morgan County | American(34.1) | German(29.2) | Irish(16.5) | English(11.8) | Scottish(5.7) |
| Woodstock | McHenry County | German(27.9) | Irish(16.5) | Polish(9.9) | English(6.9) | Italian(6.6) |
| Woosung | Ogle County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Worden | Madison County | German(36.0) | Irish(17.7) | American(9.4) | English(8.6) | Scotch-Irish(3.2) |
| Worth | Cook County | Polish(25.2) | Irish(22.5) | German(14.2) | Italian(10.0) | American(4.3) |
| Wrights | Greene County | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |
| Wyanet | Bureau County | German(29.6) | Irish(14.3) | English(11.3) | American(10.4) | Swedish(7.5) |
| Wyoming | Stark County | German(21.7) | Irish(20.5) | English(12.5) | American(9.1) | Italian(4.3) |
| Xenia | Clay County | German(17.7) | Irish(13.6) | English(8.2) | American(5.2) | Dutch(3.0) |
| Yale | Jasper County | American(21.1) | German(15.5) | Russian(2.8) | Scotch-Irish(1.4) | Dutch(1.4) |
| Yates City | Knox County | German(30.0) | English(16.8) | Irish(13.5) | American(8.0) | French(6.5) |
| Yorkville | Kendall County | German(25.7) | Irish(14.8) | Italian(14.0) | Polish(9.3) | English(8.9) |
| Zeigler | Franklin County | German(21.3) | English(16.0) | Irish(12.2) | Polish(7.9) | American(7.0) |
| Zion | Lake County | German(12.3) | Irish(10.9) | American(4.1) | English(3.5) | Polish(3.1) |
Note: Figures are 2007-2011 5-year estimates; "French" exlcudes Basque; Please refer to the Explanation of Data for more Information