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Demographic Data Report for Iowa by County
Population: Age under 18
All Races (includes Hispanic), Both Sexes
2017-2021 American Community Survey 5-Year Data
Sorted by Value
County
 sort alphabetically by name ascending
Value (Percent)
 sort by value descending
People (Age Under 18)
 sort by sample size ascending
Rank within US
(of 3143 counties)
 sort by rank ascending
United States 22.5 74,234,075 N/A
Iowa 23.3 742,175 15 of 52
Story County 16.6 16,316 2,982
Winneshiek County 18.6 3,740 2,734
Dickinson County 19.5 3,423 2,531
Hardin County 19.9 3,378 2,445
Page County 19.9 3,041 2,427
Johnson County 20.0 30,374 2,405
Poweshiek County 20.0 3,733 2,390
Jefferson County 20.2 3,206 2,331
Emmet County 20.5 1,935 2,239
Worth County 20.7 1,542 2,176
Cerro Gordo County 21.0 9,086 2,072
Fayette County 21.4 4,183 1,961
Webster County 21.5 7,967 1,928
Adams County 21.5 794 1,921
Boone County 21.6 5,780 1,859
Henry County 21.6 4,433 1,857
Lee County 21.6 7,301 1,850
Clayton County 21.7 3,731 1,807
Jones County 21.8 4,498 1,801
Decatur County 21.8 1,684 1,771
Hancock County 21.8 2,367 1,757
Black Hawk County 22.0 28,843 1,705
Shelby County 22.0 2,586 1,672
Cedar County 22.1 4,092 1,625
Winnebago County 22.2 2,382 1,610
Jackson County 22.2 4,324 1,608
Guthrie County 22.2 2,356 1,586
Kossuth County 22.2 3,297 1,577
Audubon County 22.3 1,259 1,571
Sac County 22.3 2,193 1,544
Monona County 22.3 1,950 1,536
Adair County 22.4 1,663 1,522
Jasper County 22.4 8,442 1,501
Calhoun County 22.4 2,236 1,481
Greene County 22.6 1,997 1,432
Pocahontas County 22.6 1,604 1,428
Louisa County 22.6 2,466 1,419
Union County 22.6 2,761 1,418
Cherokee County 22.7 2,629 1,415
Lucas County 22.7 1,964 1,386
Cass County 22.8 2,998 1,344
Fremont County 22.8 1,528 1,338
Des Moines County 22.8 8,908 1,337
Clinton County 22.8 10,645 1,318
Appanoose County 22.9 2,816 1,305
Floyd County 22.9 3,591 1,286
Dubuque County 22.9 22,618 1,283
Bremer County 22.9 5,701 1,277
Hamilton County 23.0 3,464 1,257
Butler County 23.0 3,323 1,231
Keokuk County 23.1 2,322 1,203
Iowa County 23.2 3,851 1,163
Van Buren County 23.2 1,671 1,158
Wapello County 23.3 8,221 1,144
Linn County 23.3 53,295 1,113
Taylor County 23.4 1,388 1,077
Clay County 23.4 3,847 1,054
Benton County 23.5 6,016 1,051
Marion County 23.5 7,829 1,048
Franklin County 23.5 2,359 1,045
Harrison County 23.5 3,423 1,040
Grundy County 23.5 2,903 1,013
Mills County 23.6 3,457 995
Palo Alto County 23.7 2,131 958
Osceola County 23.7 1,462 951
Pottawattamie County 23.7 22,184 949
Allamakee County 23.8 3,351 903
Scott County 23.9 41,552 882
Chickasaw County 23.9 2,872 868
Humboldt County 24.0 2,308 817
Carroll County 24.0 4,981 811
Mahaska County 24.0 5,316 802
Delaware County 24.0 4,210 796
O'Brien County 24.1 3,405 786
Mitchell County 24.1 2,537 779
Ringgold County 24.2 1,149 724
Tama County 24.3 4,154 706
Montgomery County 24.4 2,515 693
Monroe County 24.4 1,853 678
Warren County 24.8 12,858 570
Wright County 24.8 3,221 567
Ida County 24.8 1,733 563
Muscatine County 24.9 10,737 550
Polk County 24.9 121,827 538
Washington County 24.9 5,616 535
Plymouth County 25.2 6,441 480
Crawford County 25.4 4,210 438
Madison County 25.5 4,179 431
Marshall County 25.6 10,257 414
Howard County 25.6 2,418 411
Wayne County 25.9 1,684 351
Clarke County 26.2 2,546 317
Woodbury County 26.2 27,491 316
Buena Vista County 26.2 5,430 309
Buchanan County 26.4 5,430 290
Sioux County 27.4 9,759 197
Dallas County 27.5 26,545 184
Lyon County 28.4 3,392 142
Davis County 29.7 2,691 101
Notes:
Created by statecancerprofiles.cancer.gov on 10/04/2023 10:52 am.
Source: Demographic data provided by the Census Bureau and the American Community Survey.
For more information about Population: Age under 18, see the dictionary.
Data for United States does not include Puerto Rico.

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