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Iowa Genealogy Records By County
| Name | Created | Created from | County seat |
|---|---|---|---|
| Adair County | 1851 | Cass | Greenfield |
| Adams County | 1851 | Taylor | Corning |
| Allamakee County | 1847 | Clayton | Waukon |
| Appanoose County | 1843 | Davis | Centerville |
| Audubon County | 1851 | Cass, Black Hawk | Audubon |
| Benton County | 1837 | Indian Land Purchase; Wisconsin Territory | Vinton |
| Black Hawk County | 1843 | Delaware | Waterloo |
| Boone County | 1846 | Polk | Boone |
| Bremer County | 1851 | Winnebago, Indian Reserve | Waverly |
| Buchanan County | 1837 | Delaware, Wisconsin Territory | Independence |
| Buena Vista County | 1851 | Sac, Clay | Storm Lake |
| Butler County | 1851 | Buchanan, Black Hawk | Allison |
| Calhoun County | 1855 | formerly called Fox | Rockwell City |
| Carroll County | 1851 | Guthrie | Carroll |
| Cass County | 1851 | Pottawattamie | Atlantic |
| Cedar County | 1837 | Wisconsin Territory | Tipton |
| Cerro Gordo County | 1851 | Floyd | Mason City |
| Cherokee County | 1851 | Crawford | Cherokee |
| Chickasaw County | 1851 | Fayette | New Hampton |
| Clarke County | 1846 | Lucas | Osceola |
| Clay County | 1851 | Indian Lands | Spencer |
| Clayton County | 1837 | Dubuque, Wisconsin Territory | Elkader |
| Clinton County | 1837 | Dubuque, Wisconsin Territory | Clinton |
| Crawford County | 1851 | Shelby | Denison |
| Dallas County | 1846 | Polk | Adel |
| Davis County | 1843 | Van Buren | Bloomfield |
| Decatur County | 1846 | Appanoose | Leon |
| Delaware County | 1837 | Dubuque, Wisconsin Territory | Manchester |
| Des Moines County (Originally Demoine) | 1834 | Michigan Territory; 1836 Wisconsin Territory | Burlington |
| Dickinson County | 1851 | Kossuth | Spirit Lake |
| Dubuque County | 1834 | Michigan Territory; 1836 Wisconsin Territory | Dubuque |
| Emmet County | 1851 | Kossuth, Dickinson | Estherville |
| Fayette County | 1837 | Clayton, Wisconsin Territory | West Union |
| Floyd County | 1851 | Chickasaw | Charles City |
| Franklin County | 1851 | Chickasaw | Hampton |
| Fremont County | 1847 | Pottawattamie | Sidney |
| Greene County | 1851 | Dallas | Jefferson |
| Grundy County | 1851 | Black Hawk | Grundy Center |
| Guthrie County | 1851 | Jackson | Guthrie Center |
| Hamilton County | 1856 | Webster | Webster City |
| Hancock County | 1851 | Wright | Garner |
| Hardin County | 1851 | Black Hawk | Eldora |
| Harrison County | 1851 | Pottawattamie | Logan |
| Henry County | 1836 | Wisconsin Territory | Mount Pleasant |
| Howard County | 1851 | Chickasaw, Floyd | Cresco |
| Humboldt County | 1851 | Webster (originally spelled Humbolt) | Dakota City |
| Ida County | 1851 | Cherokee | Ida Grove |
| Iowa County | 1843 | Washington | Marengo |
| Jackson County | 1837 | Wisconsin Territory | Maquoketa |
| Jasper County | 1846 | Mahaska | Newton |
| Jefferson County | 1839 | Indian Land Purchase | Fairfield |
| Johnson County | 1837 | Des Moines, Wisconsin Territory | Iowa City |
| Jones County | 1837 | Wisconsin Territory | Anamosa |
| Keokuk County | 1843 | Washington | Sigourney |
| Kossuth County | 1851 | Webster | Algona |
| Lee County | 1836 | Des Moines | Fort Madison |
| Linn County | 1837 | Wisconsin Territory | Cedar Rapids |
| Louisa County | 1836 | Des Moines | Wapello |
| Lucas County | 1846 | Monroe | Chariton |
| Lyon County | 1851 | Woodbury | Rock Rapids |
| Madison County | 1846 | Polk | Winterset |
| Mahaska County | 1843 | Fox, Sac Indian Purchase | Oskaloosa |
| Marion County | 1845 | Washington | Knoxville |
| Marshall County | 1846 | Jasper | Marshalltown |
| Mills County | 1851 | Pottawattamie | Glenwood |
| Mitchell County | 1851 | Chickasaw | Osage |
| Monona County | 1851 | Harrison | Onawa |
| Monroe County | 1843 | Monroe (formerly Kishkekosh) | Albia |
| Montgomery County | 1851 | Polk | Red Oak |
| Muscatine County | 1836 | Des Moines | Muscatine |
| O'Brien County | 1851 | Cherokee | Primghar |
| Osceola County | 1851 | Woodbury | Sibley |
| Page County | 1847 | Pottawattamie | Clarinda |
| Palo Alto County | 1858 | Kossuth | Emmetsburg |
| Plymouth County | 1851 | Woodbury | Le Mars |
| Pocahontas County | 1851 | Humboldt, Greene | Pocahantas |
| Polk County | 1846 | Indian Lands | Des Moines |
| Pottawattamie County | 1848 | Indian Lands | Council Bluffs |
| Poweshiek County | 1843 | Mesquakie Indian Lands | Montezuma |
| Ringgold County | 1847 | Taylor | Mount Ayr |
| Sac County | 1851 | Greene | Sac City |
| Scott County | 1837 | Wisconsin Territory | Davenport |
| Shelby County | 1851 | Cass | Harlan |
| Sioux County | 1851 | Plymouth | Orange City |
| Story County | 1846 | Jasper, Polk, Boone | Nevada |
| Tama County | 1843 | Boone, Benton | Toledo |
| Taylor County | 1847 | Page | Bedford |
| Union County | 1851 | Clarke | Creston |
| Van Buren County | 1836 | Des Moines | Keosauqua |
| Wapello County | 1843 | Indian Lands | Ottumwa |
| Warren County | 1846 | Polk | Indianola |
| Washington County | 1837 | Wisconsin Territory; formerly Slaughter | Washington |
| Wayne County | 1846 | Appanoose | Corydon |
| Webster County | 1851 | Yell, Risley | Fort Dodge |
| Winnebago County | 1851 | Kossuth | Forest City |
| Winneshiek County | 1847 | Indian Lands | Decorah |
| Woodbury County | 1851 | Indian Lands (formerly Wahkaw) | Sioux City |
| Worth County | 1851 | Mitchell | Northwood |
| Wright County | 1851 | Webster | Clarion |
Counties No Longer In Existance
| County | Created | Created From | Change |
|---|---|---|---|
| Bancroft | 1851 | - | Extinct |
| Buncombe | - | - | Changed to Lyon,1862 |
| Cook | 1836 | Demoin & Dubuque | Extinct |
| Fox | 1851 | - | Renamed Calhoun, 1855 |
| Keokuk | 1837 | Wisconsin Territory | Extinct |
| Kishkekosh | - | - | Changed to Monroe, 1846 |
| Madison | 1844 | - | Extinct |
| Risley | 1851 | - | Changed to Webster, 1853 |
| Slaughter | 1837 | Wisconsin Territory | Renamed Washington, 1838 |
| Wahkaw | 1851 | - | Changed to Woodbury, 1853 |
| Yell | 1851 | - | Extinct |
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