| population | |
| Adair County | 7496 |
| Adams County | 3704 |
| Allamakee County | 14061 |
| Appanoose County | 12317 |
| Audubon County | 5674 |
| Benton County | 25575 |
| Black Hawk County | 131090 |
| Boone County | 26715 |
| Bremer County | 24988 |
| Buchanan County | 20565 |
| Buena Vista County | 20260 |
| Butler County | 14867 |
| Calhoun County | 9927 |
| Carroll County | 20760 |
| Cass County | 13127 |
| Cedar County | 18505 |
| Cerro Gordo County | 44151 |
| Cherokee County | 11658 |
| Chickasaw County | 12012 |
| Clarke County | 9748 |
| Clay County | 16384 |
| Clayton County | 17043 |
| Clinton County | 46460 |
| Crawford County | 16525 |
| Dallas County | 99678 |
| Davis County | 9110 |
| Decatur County | 7645 |
| Delaware County | 17488 |
| Des Moines County | 40325 |
| Dickinson County | 17703 |
| Dubuque County | 99266 |
| Emmet County | 9388 |
| Fayette County | 19509 |
| population | |
| Floyd County | 15627 |
| Franklin County | 10019 |
| Fremont County | 6605 |
| Greene County | 8771 |
| Grundy County | 12329 |
| Guthrie County | 10623 |
| Hamilton County | 15039 |
| Hancock County | 10795 |
| Hardin County | 16878 |
| Harrison County | 14582 |
| Henry County | 20482 |
| Howard County | 9469 |
| Humboldt County | 9597 |
| Ida County | 7005 |
| Iowa County | 16662 |
| Jackson County | 19485 |
| Jasper County | 37813 |
| Jefferson County | 15663 |
| Johnson County | 152854 |
| Jones County | 20646 |
| Keokuk County | 10033 |
| Kossuth County | 14828 |
| Lee County | 33555 |
| Linn County | 230299 |
| Louisa County | 10837 |
| Lucas County | 8634 |
| Lyon County | 11934 |
| Madison County | 15679 |
| Mahaska County | 22190 |
| Marion County | 33414 |
| Marshall County | 40105 |
| Mills County | 14484 |
| Mitchell County | 10565 |
| population | |
| Monona County | 8751 |
| Monroe County | 7577 |
| Montgomery County | 10330 |
| Muscatine County | 43235 |
| O'Brien County | 14182 |
| Osceola County | 6192 |
| Page County | 15211 |
| Palo Alto County | 9421 |
| Plymouth County | 25698 |
| Pocahontas County | 7078 |
| Polk County | 492401 |
| Pottawattamie County | 93667 |
| Poweshiek County | 18662 |
| Ringgold County | 4663 |
| Sac County | 9814 |
| Scott County | 174669 |
| Shelby County | 11746 |
| Sioux County | 35872 |
| Story County | 89542 |
| Tama County | 17135 |
| Taylor County | 5896 |
| Union County | 12138 |
| Van Buren County | 7570 |
| Wapello County | 35437 |
| Warren County | 46225 |
| Washington County | 22565 |
| Wayne County | 6497 |
| Webster County | 36999 |
| Winnebago County | 10679 |
| Winneshiek County | 20070 |
| Woodbury County | 105941 |
| Worth County | 7443 |
| Wright County | 12943 |
 | Ames Municipal Airport | ~ 10.07 km |
| Boone Municipal Airport | ~ 29.19 km |
| Des Moines International Airport | ~ 53.57 km |
| Newton Municipal Airport | ~ 53.72 km |
| Iowa Falls Municipal Airport | ~ 55.66 km |
| Webster City Municipal Airport | ~ 57.22 km |
| Perry Municipal Airport | ~ 57.83 km |
| Jefferson Municipal Airport | ~ 69.59 km |
| Hampton Municipal Airport | ~ 83.54 km |
