Demographics Table
Demographic Data Report for Iowa by County
Population: Age 40 and over
All Races (includes Hispanic), Both Sexes
2020-2024 American Community Survey 5-Year Data
Sorted by Percent
County
|
2023 Rural-Urban Continuum Codes Φ
|
Value (Percent)
|
People (Age 40 And Over)
|
Rank within US (of 3143 counties)
|
|---|---|---|---|---|
| Iowa | N/A | 48.3 | 1,549,508 | 34 of 52 |
| United States | N/A | 48.5 | 162,458,898 | N/A |
| Story County | Urban | 35.0 | 35,118 | 3,115 |
| Johnson County | Urban | 38.6 | 60,534 | 3,071 |
| Dallas County | Urban | 43.5 | 46,919 | 2,881 |
| Sioux County | Rural | 43.9 | 15,913 | 2,841 |
| Buena Vista County | Rural | 44.1 | 9,146 | 2,832 |
| Polk County | Urban | 44.2 | 222,644 | 2,824 |
| Black Hawk County | Urban | 44.8 | 58,759 | 2,781 |
| Woodbury County | Urban | 45.8 | 48,639 | 2,688 |
| Decatur County | Rural | 46.9 | 3,639 | 2,568 |
| Davis County | Rural | 47.0 | 4,302 | 2,552 |
| Lyon County | Rural | 47.0 | 5,712 | 2,552 |
| Clarke County | Rural | 47.7 | 4,608 | 2,458 |
| Marshall County | Rural | 48.2 | 19,315 | 2,389 |
| Warren County | Urban | 48.4 | 26,308 | 2,359 |
| Bremer County | Urban | 48.5 | 12,234 | 2,339 |
| Dubuque County | Urban | 48.5 | 48,072 | 2,339 |
| Crawford County | Rural | 48.7 | 7,934 | 2,309 |
| Linn County | Urban | 48.7 | 112,006 | 2,309 |
| Howard County | Rural | 48.9 | 4,620 | 2,280 |
| Mahaska County | Rural | 48.9 | 10,761 | 2,280 |
| Scott County | Urban | 49.2 | 85,888 | 2,214 |
| O'Brien County | Rural | 49.3 | 6,971 | 2,185 |
| Wapello County | Rural | 49.3 | 17,443 | 2,185 |
| Wright County | Rural | 49.4 | 6,324 | 2,164 |
| Muscatine County | Rural | 49.5 | 21,071 | 2,137 |
| Webster County | Rural | 49.6 | 18,303 | 2,109 |
| Marion County | Rural | 49.9 | 16,798 | 2,056 |
| Pottawattamie County | Urban | 50.1 | 46,837 | 2,012 |
| Buchanan County | Rural | 50.6 | 10,461 | 1,884 |
| Madison County | Urban | 50.8 | 8,596 | 1,836 |
| Union County | Rural | 50.8 | 6,087 | 1,836 |
| Washington County | Urban | 50.8 | 11,466 | 1,836 |
| Monroe County | Rural | 51.0 | 3,835 | 1,793 |
| Poweshiek County | Rural | 51.0 | 9,451 | 1,793 |
| Plymouth County | Rural | 51.2 | 13,183 | 1,740 |
| Tama County | Rural | 51.3 | 8,650 | 1,728 |
| Henry County | Rural | 51.5 | 10,293 | 1,669 |
| Carroll County | Rural | 51.8 | 10,669 | 1,593 |
| Ida County | Rural | 51.8 | 3,577 | 1,593 |
| Jasper County | Urban | 51.8 | 19,660 | 1,593 |
| Wayne County | Rural | 51.9 | 3,388 | 1,570 |
| Grundy County | Urban | 52.1 | 6,450 | 1,510 |
| Adair County | Rural | 52.2 | 3,893 | 1,488 |
| Harrison County | Urban | 52.3 | 7,650 | 1,461 |
| Clay County | Rural | 52.4 | 8,633 | 1,437 |
| Clinton County | Rural | 52.5 | 24,284 | 1,412 |
| Des Moines County | Rural | 52.6 | 20,243 | 1,379 |
| Hamilton County | Rural | 52.6 | 7,826 | 1,379 |
| Humboldt County | Rural | 52.6 | 5,043 | 1,379 |
| Mills County | Urban | 52.6 | 7,665 | 1,379 |
| Winnebago County | Rural | 52.6 | 5,563 | 1,379 |
| Mitchell County | Rural | 52.9 | 5,592 | 1,302 |
| Boone County | Urban | 53.0 | 14,128 | 1,288 |
| Allamakee County | Rural | 53.1 | 7,485 | 1,267 |
| Appanoose County | Rural | 53.2 | 6,486 | 1,245 |
| Calhoun County | Rural | 53.2 | 5,218 | 1,245 |
| Lucas County | Rural | 53.2 | 4,639 | 1,245 |
| Palo Alto County | Rural | 53.2 | 4,713 | 1,245 |
| Louisa County | Rural | 53.3 | 5,691 | 1,225 |
| Iowa County | Rural | 53.4 | 8,813 | 1,205 |
| Franklin County | Rural | 53.5 | 5,329 | 1,177 |
| Winneshiek County | Rural | 53.5 | 10,628 | 1,177 |
| Benton County | Urban | 53.6 | 13,798 | 1,158 |
| Keokuk County | Rural | 53.6 | 5,316 | 1,158 |
| Pocahontas County | Rural | 53.6 | 3,779 | 1,158 |
| Osceola County | Rural | 53.8 | 3,280 | 1,103 |
| Delaware County | Rural | 53.9 | 9,456 | 1,083 |
| Chickasaw County | Rural | 54.0 | 6,370 | 1,065 |
| Montgomery County | Rural | 54.0 | 5,515 | 1,065 |
| Cedar County | Rural | 54.1 | 9,925 | 1,045 |
| Fayette County | Rural | 54.1 | 10,444 | 1,045 |
| Kossuth County | Rural | 54.1 | 7,859 | 1,045 |
| Emmet County | Rural | 54.3 | 5,033 | 993 |
| Floyd County | Rural | 54.3 | 8,317 | 993 |
| Jones County | Urban | 54.3 | 11,337 | 993 |
| Ringgold County | Rural | 54.4 | 2,527 | 971 |
| Jefferson County | Rural | 54.5 | 8,555 | 952 |
| Butler County | Rural | 54.6 | 7,795 | 926 |
| Cass County | Rural | 54.6 | 7,155 | 926 |
| Greene County | Rural | 54.6 | 4,741 | 926 |
| Lee County | Rural | 54.6 | 17,960 | 926 |
| Taylor County | Rural | 54.6 | 3,201 | 926 |
| Shelby County | Rural | 54.7 | 6,447 | 909 |
| Cerro Gordo County | Rural | 54.9 | 23,416 | 869 |
| Monona County | Rural | 54.9 | 4,700 | 869 |
| Jackson County | Rural | 55.0 | 10,674 | 853 |
| Page County | Rural | 55.6 | 8,419 | 751 |
| Van Buren County | Rural | 55.9 | 4,051 | 695 |
| Cherokee County | Rural | 56.0 | 6,494 | 682 |
| Hancock County | Rural | 56.2 | 5,992 | 652 |
| Sac County | Rural | 56.2 | 5,442 | 652 |
| Adams County | Rural | 56.3 | 2,039 | 638 |
| Hardin County | Rural | 56.4 | 9,386 | 628 |
| Worth County | Rural | 56.4 | 4,147 | 628 |
| Guthrie County | Urban | 57.0 | 6,090 | 566 |
| Clayton County | Rural | 57.3 | 9,750 | 527 |
| Fremont County | Rural | 58.1 | 3,782 | 434 |
| Audubon County | Rural | 59.7 | 3,341 | 292 |
| Dickinson County | Rural | 60.4 | 10,869 | 243 |
Notes:
Created by statecancerprofiles.cancer.gov on 03/22/2026 2:37 pm.
Φ Rural–urban county classifications are based on the 2023 USDA Rural–Urban Continuum Codes (except for Connecticut Counties which use 2013 codes). State-level cancer rates for rural areas are calculated using cancer cases registered exclusively in rural counties, while state-level cancer rates for urban areas are calculated using cases registered exclusively in urban counties.
Source: Demographic data provided by the Census Bureau and the American Community Survey.
For more information about Population: Age 40 and over, see the dictionary.
Data for United States does not include Puerto Rico.