| County | County Seat |
|---|
| Adams | |
| Alexander | |
| Bond | |
| Boone | |
| Brown | |
| Bureau | |
| Calhoun | |
| Carroll | |
| Cass | |
| Champaign | |
| Christian | |
| Clark | |
| Clay | |
| Clinton | |
| Coles | |
| Cook | |
| Crawford | |
| Cumberland | |
| DeKalb | |
| De Witt | |
| Douglas | |
| DuPage | |
| Edgar | |
| Edwards | |
| Effingham | |
| Fayette | |
| Ford | |
| Franklin | |
| Fulton | |
| Gallatin | |
| Greene | |
| Grundy | |
| Hamilton | |
| Hancock | |
| | County | County Seat |
|---|
| Hardin | |
| Henderson | |
| Henry | |
| Iroquois | |
| Jackson | |
| Jasper | |
| Jefferson | |
| Jersey | |
| Jo Daviess | |
| Johnson | |
| Kane | |
| Kankakee | |
| Kendall | |
| Knox | |
| Lake | |
| La Salle | |
| Lawrence | |
| Lee | |
| Livingston | |
| Logan | |
| Macon | |
| Macoupin | |
| Madison | |
| Marion | |
| Marshall | |
| Mason | |
| Massac | |
| McDonough | |
| McHenry | |
| McLean | |
| Menard | |
| Mercer | |
| Monroe | |
| Montgomery | |
| | County | County Seat |
|---|
| Morgan | |
| Moultrie | |
| Ogle | |
| Peoria | |
| Perry | |
| Piatt | |
| Pike | |
| Pope | |
| Pulaski | |
| Putnam | |
| Randolph | |
| Richland | |
| Rock Island | |
| St. Clair | |
| Saline | |
| Sangamon | |
| Schuyler | |
| Scott | |
| Shelby | |
| Stark | |
| Stephenson | |
| Tazewell | |
| Union | |
| Vermilion | |
| Wabash | |
| Warren | |
| Washington | |
| Wayne | |
| White | |
| Whiteside | |
| Will | |
| Williamson | |
| Winnebago | |
| Woodford | |
|
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