Iowa — All 99 Counties
Iowa has 99 counties with 1,028 communities and a combined population of 2,610,125.
| County | Towns | Population |
|---|
| Polk County | 14 | 380,488 |
| Linn County | 17 | 209,242 |
| Dallas County | 17 | 200,381 |
| Scott County | 17 | 159,225 |
| Johnson County | 12 | 133,336 |
| Black Hawk County | 12 | 124,535 |
| Plymouth County | 12 | 103,517 |
| Story County | 13 | 88,011 |
| Pottawattamie County | 18 | 77,657 |
| Dubuque County | 20 | 75,755 |
| Clinton County | 16 | 44,666 |
| Cerro Gordo County | 13 | 39,398 |
| Muscatine County | 13 | 36,273 |
| Marshall County | 14 | 33,162 |
| Des Moines County | 11 | 31,519 |
| Webster County | 14 | 30,141 |
| Jasper County | 14 | 28,659 |
| Sioux County | 13 | 27,937 |
| Wapello County | 6 | 27,240 |
| Mahaska County | 11 | 27,177 |
| Lee County | 13 | 24,237 |
| Boone County | 12 | 20,616 |
| Warren County | 11 | 19,770 |
| Benton County | 15 | 17,699 |
| Bremer County | 7 | 17,427 |
| Buena Vista County | 10 | 17,409 |
| Carroll County | 13 | 16,908 |
| Henry County | 14 | 14,805 |
| Cedar County | 11 | 14,458 |
| Washington County | 8 | 14,440 |
| Crawford County | 14 | 13,648 |
| Dickinson County | 10 | 13,594 |
| Clay County | 10 | 13,531 |
| Poweshiek County | 9 | 13,531 |
| Fayette County | 13 | 13,204 |
| Delaware County | 11 | 13,094 |
| Jones County | 10 | 12,461 |
| Woodbury County | 15 | 12,105 |
| Jefferson County | 7 | 11,625 |
| Buchanan County | 10 | 11,622 |
| Hancock County | 13 | 11,594 |
| Hamilton County | 9 | 11,528 |
| Marion County | 8 | 11,458 |
| O'Brien County | 8 | 11,137 |
| Hardin County | 12 | 11,000 |
| Tama County | 12 | 10,888 |
| Winneshiek County | 9 | 10,831 |
| Iowa County | 15 | 10,628 |
| Kossuth County | 16 | 10,420 |
| Cass County | 8 | 10,204 |
| Clayton County | 17 | 10,128 |
| Wright County | 7 | 10,091 |
| Butler County | 10 | 9,870 |
| Franklin County | 12 | 9,595 |
| Floyd County | 7 | 9,297 |
| Union County | 7 | 9,048 |
| Fremont County | 12 | 9,019 |
| Madison County | 8 | 8,705 |
| Grundy County | 9 | 8,596 |
| Allamakee County | 6 | 8,471 |
| Humboldt County | 13 | 8,320 |
| Cherokee County | 8 | 8,293 |
| Calhoun County | 13 | 8,285 |
| Mills County | 8 | 8,031 |
| Montgomery County | 6 | 7,726 |
| Chickasaw County | 9 | 7,581 |
| Appanoose County | 11 | 7,344 |
| Emmet County | 6 | 7,243 |
| Shelby County | 12 | 7,237 |
| Page County | 10 | 7,210 |
| Lyon County | 8 | 7,023 |
| Harrison County | 11 | 6,940 |
| Keokuk County | 16 | 6,407 |
| Louisa County | 9 | 6,346 |
| Clarke County | 3 | 6,291 |
| Sac County | 8 | 6,173 |
| Greene County | 7 | 6,127 |
| Monona County | 10 | 6,028 |
| Palo Alto County | 8 | 6,002 |
| Adair County | 7 | 5,879 |
| Howard County | 5 | 5,865 |
| Mitchell County | 13 | 5,785 |
| Guthrie County | 9 | 5,761 |
| Jackson County | 11 | 5,547 |
| Lucas County | 5 | 5,257 |
| Ida County | 5 | 5,005 |
| Decatur County | 10 | 4,902 |
| Worth County | 8 | 4,665 |
| Pocahontas County | 8 | 4,422 |
| Osceola County | 5 | 4,327 |
| Monroe County | 3 | 4,304 |
| Winnebago County | 6 | 3,976 |
| Van Buren County | 10 | 3,543 |
| Ringgold County | 13 | 3,490 |
| Wayne County | 8 | 3,452 |
| Adams County | 5 | 3,406 |
| Davis County | 4 | 3,361 |
| Audubon County | 5 | 3,347 |
| Taylor County | 7 | 2,213 |