# Counties in Iowa by median age, 2024

All 99 values come from U.S. Census Bureau for 2024, so the places are comparable.

- Indicator id: `median_age`
- Unit: years
- Definition: Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.
- Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population (https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/median-age/iowa-counties
- CSV: https://invokely.ai/download/rankings/median-age/iowa-counties.csv

| Rank | Place | years |
|---:|---|---:|
| 1 | Dickinson County | 48.7 |
| 2 | Audubon County | 47 |
| 3 | Fremont County | 46.8 |
| 4 | Guthrie County | 46.7 |
| 5 | Clayton County | 46.4 |
| 6 | Adams County | 46.3 |
| 7 | Sac County | 46.2 |
| 8 | Hardin County | 45.4 |
| 9 | Page County | 45.1 |
| 10 | Jackson County | 44.7 |
| 10 | Van Buren County | 44.7 |
| 12 | Greene County | 44.6 |
| 12 | Hancock County | 44.6 |
| 14 | Ringgold County | 44.5 |
| 15 | Shelby County | 44.3 |
| 16 | Kossuth County | 44.2 |
| 17 | Worth County | 44.1 |
| 18 | Cedar County | 44 |
| 18 | Cerro Gordo County | 44 |
| 18 | Cherokee County | 44 |
| 21 | Fayette County | 43.9 |
| 22 | Taylor County | 43.8 |
| 23 | Butler County | 43.7 |
| 23 | Jefferson County | 43.7 |
| 23 | Monona County | 43.7 |
| 23 | Pocahontas County | 43.7 |
| 27 | Lee County | 43.6 |
| 28 | Appanoose County | 43.5 |
| 28 | Cass County | 43.5 |
| 28 | Floyd County | 43.5 |
| 28 | Montgomery County | 43.5 |
| 32 | Delaware County | 43.4 |
| 32 | Keokuk County | 43.4 |
| 34 | Allamakee County | 43.1 |
| 34 | Benton County | 43.1 |
| 34 | Chickasaw County | 43.1 |
| 34 | Osceola County | 43.1 |
| 38 | Emmet County | 42.9 |
| 39 | Calhoun County | 42.8 |
| 39 | Jones County | 42.8 |
| 41 | Franklin County | 42.7 |
| 41 | Winnebago County | 42.7 |
| 43 | Winneshiek County | 42.6 |
| 44 | Adair County | 42.4 |
| 44 | Boone County | 42.4 |
| 44 | Clinton County | 42.4 |
| 44 | Iowa County | 42.4 |
| 48 | Clay County | 42.3 |
| 48 | Des Moines County | 42.3 |
| 50 | Harrison County | 42.1 |
| 50 | Humboldt County | 42.1 |
| 50 | Mills County | 42.1 |
| 53 | Ida County | 42 |
| 54 | Grundy County | 41.9 |
| 54 | Louisa County | 41.9 |
| 54 | Lucas County | 41.9 |
| 54 | Mitchell County | 41.9 |
| 54 | Palo Alto County | 41.9 |
| 59 | Monroe County | 41.8 |
| 60 | Hamilton County | 41.7 |
| 61 | Tama County | 41.5 |
| 61 | Wayne County | 41.5 |
| 63 | Jasper County | 41.3 |
| 63 | Plymouth County | 41.3 |
| 65 | Carroll County | 41.1 |
| 65 | Henry County | 41.1 |
| 67 | Poweshiek County | 41 |
| 68 | Washington County | 40.7 |
| 69 | Madison County | 40.6 |
| 70 | Union County | 40.5 |
| 71 | Buchanan County | 40.3 |
| 72 | Pottawattamie County | 40.1 |
| 73 | Marion County | 39.9 |
| 74 | Webster County | 39.7 |
| 75 | Muscatine County | 39.6 |
| 76 | O'Brien County | 39.5 |
| 77 | Scott County | 39.4 |
| 77 | Wright County | 39.4 |
| 79 | Howard County | 39.2 |
| 79 | Wapello County | 39.2 |
| 81 | Dubuque County | 39.1 |
| 82 | Bremer County | 39 |
| 82 | Linn County | 39 |
| 82 | Mahaska County | 39 |
| 85 | Warren County | 38.8 |
| 86 | Marshall County | 38.5 |
| 87 | Lyon County | 38.2 |
| 88 | Clarke County | 37.9 |
| 88 | Crawford County | 37.9 |
| 90 | Davis County | 36.3 |
| 91 | Polk County | 36.2 |
| 92 | Dallas County | 36.1 |
| 92 | Decatur County | 36.1 |
| 92 | Woodbury County | 36.1 |
| 95 | Black Hawk County | 35.7 |
| 96 | Buena Vista County | 35.6 |
| 97 | Sioux County | 33.8 |
| 98 | Johnson County | 31 |
| 99 | Story County | 26.9 |