# Lijst van county's in Illinois

De Amerikaanse staat Illinois is onderverdeeld in 102 county's:
| County | Inwoners 1 juli 2007 | Hoofdplaats | Inwoners 1 juli 2007 |
| Adams | 67.046 | Quincy | 40.069 |
| Alexander | 8458 | Cairo | 3151 |
| Bond | 18.103 | Greenville | 7163 |
| Boone | 53.531 | Belvidere | 26.156 |
| Brown | 6566 | Mount Sterling | 1904 |
| Bureau | 35.036 | Princeton | 7526 |
| Calhoun | 5167 | Hardin | 948 |
| Carroll | 15.928 | Mount Carroll | 1670 |
| Cass | 13.727 | Virginia | 1684 |
| Champaign | 190.260 | Urbana | 39.484 |
| Christian | 34.543 | Taylorville | 12.222 |
| Clark | 16.884 | Marshall | 3737 |
| Clay | 13.893 | Louisville | 1235 |
| Clinton | 36.450 | Carlyle | 3369 |
| Coles | 51.011 | Charleston | 20.296 |
| Cook | 5.285.107 | Chicago | 2.836.658 |
| Crawford | 19.611 | Robinson | 6392 |
| Cumberland | 10.842 | Toledo | 1128 |
| DeKalb | 103.729 | Clinton | 7190 |
| DeWitt | 16.437 | Sycamore | 17.188 |
| Douglas | 19.598 | Tuscola | 4547 |
| DuPage | 929.192 | Wheaton | 54.552 |
| Edgar | 18.919 | Paris | 8785 |
| Edwards | 6572 | Albion | 1833 |
| Effingham | 34.225 | Effingham | 12.452 |
| Fayette | 21.466 | Vandalia | 6756 |
| Ford | 14.170 | Paxton | 4545 |
| Franklin | 39.491 | Benton | 6934 |
| Fulton | 36.843 | Lewistown | 2381 |
| Gallatin | 6025 | Shawneetown | 1318 |
| Greene | 13.890 | Carrollton | 2448 |
| Grundy | 47.144 | Morris | 13.562 |
| Hamilton | 8245 | McLeansboro | 2757 |
| Hancock | 18.839 | Carthage | 2511 |
| Hardin | 4468 | Elizabethtown | 316 |
| Henderson | 7587 | Oquawka | 1398 |
| Henry | 49.654 | Cambridge | 2094 |
| Iroquois | 30.294 | Watseka | 5493 |
| Jackson | 58.841 | Murphysboro | 8291 |
| Jasper | 9707 | Newton | 2945 |
| Jefferson | 40.168 | Mount Vernon | 16.319 |
| Jersey | 22.455 | Jerseyville | 8270 |
| Jo Daviess | 22.304 | Galena | 3354 |
| Johnson | 13.065 | Vienna | 1288 |
| Kane | 501.021 | Geneva | 24.182 |
| Kankakee | 110.705 | Kankakee | 26.608 |
| Kendall | 96.818 | Yorkville | 15.193 |
| Knox | 51.855 | Galesburg | 31.091 |
| Lake | 710.241 | Waukegan | 91.138 |
| LaSalle | 112.616 | Ottawa | 19.142 |
| Lawrence | 15.588 | Lawrenceville | 4416 |
| Lee | 35.450 | Dixon | 15.272 |
| Livingston | 38.258 | Pontiac | 11.329 |
| Logan | 29.962 | Lincoln | 14.636 |
| Macon | 108.732 | Decatur | 76.674 |
| Macoupin | 48.235 | Carlinville | 5949 |
| Madison | 267.347 | Edwardsville | 24.460 |
| Marion | 39.857 | Salem | 7470 |
| Marshall | 12.851 | Lacon | 1861 |
| Mason | 15.151 | Havana | 3343 |
| Massac | 15.109 | Metropolis | 6464 |
| McDonough | 31.992 | Macomb | 18.701 |
| McHenry | 315.943 | Woodstock | 23.215 |
| McLean | 164.209 | Bloomington | 72.416 |
| Menard | 12.466 | Petersburg | 2207 |
| Mercer | 16.490 | Aledo | 3566 |
| Monroe | 32.372 | Waterloo | 9634 |
| Montgomery | 29.810 | Hillsboro | 6181 |
| Morgan | 35.272 | Jacksonville | 19.319 |
| Moultrie | 14.324 | Sullivan | 4339 |
| Ogle | 55.011 | Oregon | 4138 |
| Peoria | 182.993 | Peoria | 113.546 |
| Perry | 22.596 | Pinckneyville | 5407 |
| Piatt | 16.493 | Monticello | 5315 |
| Pike | 16.707 | Pittsfield | 4517 |
| Pope | 4182 | Golconda | 661 |
| Pulaski | 6490 | Mound City | 602 |
| Putnam | 6014 | Hennepin | 705 |
| Randolph | 32.760 | Chester | 7795 |
| Richland | 15.546 | Olney | 8344 |
| Rock Island | 147.329 | Rock Island | 38.243 |
| Saline | 26.102 | Harrisburg | 9638 |
| Sangamon | 194.122 | Springfield | 117.090 |
| Schuyler | 6990 | Rushville | 3128 |
| Scott | 5215 | Winchester | 1558 |
| Shelby | 21.759 | Shelbyville | 4615 |
| St. Clair | 261.316 | Belleville | 41.034 |
| Stark | 6191 | Toulon | 1352 |
| Stephenson | 46.573 | Freeport | 24.769 |
| Tazewell | 131.154 | Pekin | 33.406 |
| Union | 18.257 | Jonesboro | 1832 |
| Vermilion | 81.191 | Danville | 32.476 |
| Wabash | 12.165 | Mount Carmel | 7477 |
| Warren | 17.402 | Monmouth | 9104 |
| Washington | 14.769 | Nashville | 3040 |
| Wayne | 16.568 | Fairfield | 5190 |
| White | 14.657 | Carmi | 5196 |
| Whiteside | 59.198 | Morrison | 4305 |
| Will | 673.586 | Joliet | 144.316 |
| Williamson | 64.541 | Marion | 17.275 |
| Winnebago | 298.759 | Rockford | 156.596 |
| Woodford | 38.017 | Eureka | 5235 |
* ↑ U.S. Census Bureau: Annual Estimates of the Population for Counties: April 1, 2000 to July 1, 2007
* ↑ U.S. Census Bureau: Population Estimates for All Places: 2000 to 2007
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