IOWA COUNTIES (by population) |
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| There are 99 administrative divisions, referred to as counties, in the state of Iowa. The population figures given below are from the 2000 census. You may list the counties by county name, by area in square miles, by year organized or by population by clicking on the column headings or using the pull-down list box. | |||||
| County | Area (sq miles) | County Seat | Established | Population (2000) | Search |
|---|---|---|---|---|---|
| Adams County | 424 | Corning [ Map ] | 1851 | 4,482 | Search |
| Ringgold County | 538 | Mount Ayr [ Map ] | 1855 | 5,469 | Search |
| Wayne County | 526 | Corydon [ Map ] | 1846 | 6,730 | Search |
| Audubon County | 443 | Audubon [ Map ] | 1851 | 6,830 | Search |
| Taylor County | 534 | Bedford [ Map ] | 1847 | 6,958 | Search |
| Osceola County | 399 | Sibley [ Map ] | 1851 | 7,003 | Search |
| Van Buren County | 485 | Keosauqua [ Map ] | 1836 | 7,809 | Search |
| Ida County | 432 | Ida Grove [ Map ] | 1851 | 7,837 | Search |
| Worth County | 400 | Northwood [ Map ] | 1851 | 7,909 | Search |
| Fremont County | 511 | Sidney [ Map ] | 1847 | 8,010 | Search |
| Monroe County | 433 | Albia [ Map ] | 1843 | 8,016 | Search |
| Adair County | 569 | Greenfield [ Map ] | 1851 | 8,243 | Search |
| Davis County | 503 | Bloomfield [ Map ] | 1843 | 8,541 | Search |
| Pocahontas County | 578 | Pocahontas [ Map ] | 1851 | 8,662 | Search |
| Decatur County | 532 | Leon [ Map ] | 1846 | 8,689 | Search |
| Clarke County | 431 | Osceola [ Map ] | 1846 | 9,133 | Search |
| Lucas County | 431 | Chariton [ Map ] | 1846 | 9,422 | Search |
| Howard County | 473 | Cresco [ Map ] | 1851 | 9,932 | Search |
| Monona County | 693 | Onawa [ Map ] | 1851 | 10,020 | Search |
| Palo Alto County | 564 | Emmetsburg [ Map ] | 1851 | 10,147 | Search |
| Greene County | 568 | Jefferson [ Map ] | 1851 | 10,366 | Search |
| Humboldt County | 434 | Dakota City [ Map ] | 1851 | 10,381 | Search |
| Franklin County | 582 | Hampton [ Map ] | 1851 | 10,704 | Search |
| Mitchell County | 469 | Osage [ Map ] | 1851 | 10,874 | Search |
| Emmet County | 396 | Estherville [ Map ] | 1851 | 11,027 | Search |
| Calhoun County | 570 | Rockwell City [ Map ] | 1851 | 11,115 | Search |
| Guthrie County | 591 | Guthrie Center [ Map ] | 1851 | 11,353 | Search |
| Keokuk County | 579 | Sigourney [ Map ] | 1837 | 11,400 | Search |
| Sac County | 576 | Sac City [ Map ] | 1851 | 11,529 | Search |
| Winnebago County | 400 | Forest City [ Map ] | 1847 | 11,723 | Search |
| Lyon County | 588 | Rock Rapids [ Map ] | 1851 | 11,763 | Search |
| Montgomery County | 424 | Red Oak [ Map ] | 1851 | 11,771 | Search |
| Hancock County | 571 | Garner [ Map ] | 1851 | 12,100 | Search |
| Louisa County | 402 | Wapello [ Map ] | 1836 | 12,183 | Search |
| Union County | 424 | Creston [ Map ] | 1851 | 12,309 | Search |
| Grundy County | 503 | Grundy Center [ Map ] | 1851 | 12,369 | Search |
| Cherokee County | 577 | Cherokee [ Map ] | 1851 | 13,035 | Search |
| Chickasaw County | 505 | New Hampton [ Map ] | 1851 | 13,095 | Search |
| Shelby County | 591 | Harlan [ Map ] | 1851 | 13,173 | Search |
| Appanoose County | 496 | Centerville [ Map ] | 1843 | 13,721 | Search |
| Madison County | 561 | Winterset [ Map ] | 1844 | 14,019 | Search |
| Wright County | 581 | Clarion [ Map ] | 1851 | 14,334 | Search |
| Mills County | 437 | Glenwood [ Map ] | 1851 | 14,547 | Search |
| Allamakee County | 640 | Waukon [ Map ] | 1847 | 14,675 | Search |
| Cass County | 564 | Atlantic [ Map ] | 1851 | 14,684 | Search |
| O'Brien County | 573 | Primghar [ Map ] | 1851 | 15,102 | Search |
| Butler County | 580 | Allison [ Map ] | 1851 | 15,305 | Search |
| Harrison County | 697 | Logan [ Map ] | 1851 | 15,666 | |