| County | County Seat | County Population |
| Adams | |
| Allen | |
| Bartholomew | |
| Benton | |
| Blackford | |
| Boone | |
| Brown | |
| Carroll | |
| Cass | |
| Clark | |
| Clay | |
| Clinton | |
| Crawford | |
| Daviess | |
| Dearborn | |
| Decatur | |
| DeKalb | |
| Delaware | |
| Dubois | |
| Elkhart | |
| Fayette | |
| Floyd | |
| Fountain | |
| Franklin | |
| Fulton | |
| Gibson | |
| Grant | |
| Greene | |
| Hamilton | |
| Hancock | |
| Harrison | |
| | County | County Seat | County Population |
| Hendricks | |
| Henry | |
| Howard | |
| Huntington | |
| Jackson | |
| Jasper | |
| Jay | |
| Jefferson | |
| Jennings | |
| Johnson | |
| Knox | |
| Kosciusko | |
| LaGrange | |
| Lake | |
| LaPorte | |
| Lawrence | |
| Madison | |
| Marion | |
| Marshall | |
| Martin | |
| Miami | |
| Monroe | |
| Montgomery | |
| Morgan | |
| Newton | |
| Noble | |
| Ohio | |
| Orange | |
| Owen | |
| Parke | |
| Perry | |
| | County | County Seat | County Population |
| Pike | |
| Porter | |
| Posey | |
| Pulaski | |
| Purtnam | |
| Randolph | |
| Ripley | |
| Rush | |
| St. Joseph | |
| Scott | |
| Shelby | |
| Spencer | |
| Starke | |
| Steuben | |
| Sullivan | |
| Switzerland | |
| Tippecanoe | |
| Tipton | |
| Union | |
| Vanderburgh | |
| Vermillion | |
| Vigo | |
| Wabash | |
| Warren | |
| Warrick | |
| Washington | |
| Wayne | |
| Wells | |
| White | |
| Whitley | |
|