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