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Demographic Data Report for Iowa by County
Population: Age 18-39
All Races (includes Hispanic), Both Sexes
2019-2023 American Community Survey 5-Year Data
Sorted by Count

County
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2023 Rural-Urban Continuum Codes Φ
 sort by rural urban descending
Value (Percent)
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People (Age 18-39)
 sort by sample size ascending
Rank within US
(of 3143 counties)
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United States N/A 29.5 98,058,393 N/A
Iowa N/A 28.8 920,272 28 of 52
Polk County Urban 31.2 155,061 352
Linn County Urban 29.0 66,545 662
Johnson County Urban 42.1 65,192 39
Scott County Urban 27.9 48,675 880
Story County Urban 48.6 47,944 13
Black Hawk County Urban 33.4 43,684 216
Dallas County Urban 30.4 31,633 432
Woodbury County Urban 28.5 30,136 755
Dubuque County Urban 29.1 28,838 644
Pottawattamie County Urban 26.6 24,867 1,248
Warren County Urban 27.2 14,568 1,068
Muscatine County Rural 27.0 11,558 1,116
Clinton County Rural 24.3 11,287 2,094
Webster County Rural 28.9 10,648 682
Marshall County Rural 26.2 10,484 1,389
Sioux County Rural 29.0 10,451 662
Cerro Gordo County Rural 24.4 10,433 2,056
Jasper County Urban 26.2 9,917 1,389
Des Moines County Rural 25.3 9,768 1,724
Wapello County Rural 26.4 9,324 1,323
Marion County Rural 26.9 9,023 1,143
Lee County Rural 23.9 7,930 2,208
Bremer County Urban 29.3 7,354 602
Boone County Urban 26.5 7,067 1,285
Plymouth County Rural 24.1 6,205 2,153
Buena Vista County Rural 29.3 6,065 602
Benton County Urban 23.6 6,056 2,294
Mahaska County Rural 27.1 5,973 1,092
Henry County Rural 28.4 5,742 775
Washington County Urban 25.0 5,630 1,828
Winneshiek County Rural 28.1 5,605 835
Poweshiek County Rural 29.4 5,468 578
Buchanan County Rural 24.5 5,052 2,020
Jones County Urban 24.0 4,999 2,185
Fayette County Rural 25.2 4,881 1,764
Carroll County Rural 23.2 4,793 2,414
Cedar County Rural 24.6 4,539 1,991
Jackson County Rural 23.0 4,472 2,466
Jefferson County Rural 28.5 4,464 755
Crawford County Rural 26.0 4,231 1,479
Tama County Rural 24.4 4,148 2,056
Hardin County Rural 24.5 4,106 2,020
Clay County Rural 24.7 4,060 1,961
Madison County Urban 23.7 3,973 2,266
Delaware County Rural 22.3 3,910 2,639
Iowa County Rural 23.6 3,897 2,294
Page County Rural 25.1 3,813 1,791
Dickinson County Rural 21.1 3,774 2,843
O'Brien County Rural 26.0 3,665 1,479
Clayton County Rural 21.3 3,638 2,815
Harrison County Urban 24.8 3,635 1,916
Floyd County Rural 22.9 3,544 2,494
Hamilton County Rural 23.6 3,516 2,294
Mills County Urban 23.5 3,420 2,328
Kossuth County Rural 23.2 3,391 2,414
Butler County Rural 22.8 3,265 2,515
Allamakee County Rural 22.3 3,128 2,639
Wright County Rural 24.2 3,104 2,118
Union County Rural 25.4 3,060 1,691
Grundy County Urban 24.5 3,028 2,020
Appanoose County Rural 24.0 2,944 2,185
Lyon County Rural 24.3 2,940 2,094
Cass County Rural 21.6 2,833 2,761
Winnebago County Rural 26.6 2,833 1,248
Chickasaw County Rural 22.3 2,648 2,639
Louisa County Rural 24.6 2,630 1,991
Shelby County Rural 22.4 2,628 2,619
Clarke County Rural 26.3 2,546 1,356
Calhoun County Rural 25.3 2,499 1,724
Emmet County Rural 26.7 2,489 1,210
Mitchell County Rural 23.5 2,481 2,328
Hancock County Rural 22.8 2,446 2,515
Howard County Rural 25.5 2,413 1,655
Cherokee County Rural 20.7 2,396 2,899
Keokuk County Rural 24.0 2,390 2,185
Decatur County Rural 30.9 2,368 376
Montgomery County Rural 22.8 2,340 2,515
Humboldt County Rural 24.1 2,303 2,153
Franklin County Rural 22.8 2,279 2,515
Guthrie County Urban 20.9 2,229 2,866
Sac County Rural 22.4 2,190 2,619
Davis County Rural 23.5 2,148 2,328
Palo Alto County Rural 23.9 2,129 2,208
Greene County Rural 23.4 2,043 2,359
Lucas County Rural 22.6 1,966 2,567
Monona County Rural 22.8 1,964 2,515
Monroe County Rural 25.2 1,901 1,764
Adair County Rural 24.2 1,810 2,118
Worth County Rural 23.6 1,743 2,294
Ida County Rural 23.3 1,616 2,387
Pocahontas County Rural 22.7 1,600 2,546
Van Buren County Rural 20.2 1,462 2,946
Wayne County Rural 21.5 1,399 2,780
Osceola County Rural 22.4 1,372 2,619
Fremont County Rural 20.5 1,347 2,922
Taylor County Rural 22.4 1,321 2,619
Audubon County Rural 20.7 1,163 2,899
Ringgold County Rural 22.6 1,053 2,567
Adams County Rural 21.2 773 2,825
Notes:
Created by statecancerprofiles.cancer.gov on 07/02/2025 11:53 pm.

Φ Rural-Urban Continuum Codes provided by the USDA.

Source: Demographic data provided by the Census Bureau and the American Community Survey.
For more information about Population: Age 18-39, see the dictionary.

Data for United States does not include Puerto Rico.

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