| County | County Seat |
|---|
| Adair | |
| Adams | |
| Allamakee | |
| Appanoose | |
| Audubon | |
| Benton | |
| Black Hawk | |
| Boone | |
| Bremer | |
| Buchanan | |
| Buena Vista | |
| Butler | |
| Calhoun | |
| Carroll | |
| Cass | |
| Cedar | |
| Cerro Gordo | |
| Cherokee | |
| Chickasaw | |
| Clarke | |
| Clay | |
| Clayton | |
| Clinton | |
| Crawford | |
| Dallas | |
| Davis | |
| Decatur | |
| Delaware | |
| Des Moines | |
| Dickinson | |
| Dubuque | |
| Emmet | |
| Fayette | |
| | County | County Seat |
|---|
| Floyd | |
| Franklin | |
| Fremont | |
| Greene | |
| Grundy | |
| Guthrie | |
| Hamilton | |
| Hancock | |
| Hardin | |
| Harrison | |
| Henry | |
| Howard | |
| Humboldt | |
| Ida | |
| Iowa | |
| Jackson | |
| Jasper | |
| Jefferson | |
| Johnson | |
| Jones | |
| Keokuk | |
| Kossuth | |
| Lee | |
| Linn | |
| Louisa | |
| Lucas | |
| Lyon | |
| Madison | |
| Mahaska | |
| Marion | |
| Marshall | |
| Mills | |
| Mitchell | |
| | County | County Seat |
|---|
| Monona | |
| Monroe | |
| Montgomery | |
| Muscatine | |
| O'Brien | |
| Osceola | |
| Page | |
| Palo Alto | |
| Plymouth | |
| Pocahontas | |
| Polk | |
| Pottawattamie | |
| Poweshiek | |
| Ringgold | |
| Sac | |
| Scott | |
| Shelby | |
| Sioux | |
| Story | |
| Tama | |
| Taylor | |
| Union | |
| Van Buren | |
| Wapello | |
| Warren | |
| Washington | |
| Wayne | |
| Webster | |
| Winnebago | |
| Winneshiek | |
| Woodbury | |
| Worth | |
| Wright | |
|
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