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Demographics Table

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Demographic Data Report for Iowa by County
Population: Age 40 and over
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
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Value (Percent)
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People (Age 40 And Over)
 sort by sample size ascending
Rank within US
(of 3143 counties)
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United States N/A 48.3 160,683,909 N/A
Iowa N/A 48.2 1,539,086 33 of 52
Polk County Urban 44.2 219,996 2,811
Linn County Urban 48.2 110,685 2,375
Scott County Urban 48.7 84,841 2,283
Johnson County Urban 38.4 59,413 3,067
Black Hawk County Urban 44.6 58,330 2,788
Woodbury County Urban 45.6 48,204 2,697
Dubuque County Urban 48.2 47,679 2,375
Pottawattamie County Urban 50.2 46,895 1,964
Dallas County Urban 42.8 44,564 2,903
Story County Urban 34.9 34,448 3,116
Warren County Urban 48.1 25,744 2,398
Clinton County Rural 53.0 24,564 1,255
Cerro Gordo County Rural 54.7 23,388 870
Muscatine County Rural 48.7 20,833 2,283
Des Moines County Rural 52.8 20,385 1,309
Jasper County Urban 51.7 19,565 1,591
Marshall County Rural 48.4 19,360 2,334
Webster County Rural 49.7 18,328 2,071
Lee County Rural 54.8 18,170 848
Wapello County Rural 49.9 17,592 2,023
Marion County Rural 49.7 16,683 2,071
Sioux County Rural 43.5 15,659 2,858
Boone County Urban 52.6 14,021 1,368
Benton County Urban 53.3 13,701 1,189
Plymouth County Rural 50.9 13,083 1,802
Bremer County Urban 48.1 12,087 2,398
Jones County Urban 55.1 11,456 797
Washington County Urban 50.4 11,356 1,909
Carroll County Rural 52.7 10,898 1,343
Mahaska County Rural 49.0 10,810 2,224
Jackson County Rural 54.8 10,644 848
Dickinson County Rural 59.6 10,637 288
Winneshiek County Rural 53.0 10,577 1,255
Fayette County Rural 53.5 10,367 1,137
Buchanan County Rural 49.8 10,285 2,045
Henry County Rural 50.6 10,232 1,867
Cedar County Rural 53.9 9,935 1,056
Clayton County Rural 57.0 9,723 548
Delaware County Rural 54.3 9,524 959
Poweshiek County Rural 51.1 9,495 1,751
Hardin County Rural 56.2 9,406 630
Buena Vista County Rural 44.0 9,098 2,823
Iowa County Rural 53.0 8,762 1,255
Tama County Rural 51.6 8,755 1,629
Madison County Urban 51.4 8,612 1,669
Clay County Rural 52.2 8,583 1,468
Jefferson County Rural 54.4 8,528 936
Floyd County Rural 54.5 8,450 912
Page County Rural 55.7 8,447 696
Kossuth County Rural 54.5 7,968 912
Crawford County Rural 48.7 7,937 2,283
Hamilton County Rural 53.0 7,891 1,255
Butler County Rural 54.7 7,821 870
Mills County Urban 53.4 7,781 1,162
Harrison County Urban 52.1 7,633 1,497
Allamakee County Rural 53.6 7,524 1,120
Cass County Rural 54.8 7,192 848
O'Brien County Rural 49.6 7,000 2,089
Appanoose County Rural 54.5 6,677 912
Cherokee County Rural 57.6 6,669 478
Chickasaw County Rural 54.4 6,451 936
Shelby County Rural 54.8 6,443 848
Grundy County Urban 51.9 6,407 1,542
Wright County Rural 49.7 6,370 2,071
Guthrie County Urban 57.7 6,138 465
Union County Rural 50.8 6,120 1,823
Hancock County Rural 55.9 5,991 666
Lyon County Rural 47.1 5,696 2,522
Louisa County Rural 53.0 5,678 1,255
Montgomery County Rural 54.6 5,594 889
Mitchell County Rural 52.5 5,533 1,392
Winnebago County Rural 51.7 5,500 1,591
Sac County Rural 55.3 5,397 770
Keokuk County Rural 53.3 5,312 1,189
Franklin County Rural 52.7 5,259 1,343
Calhoun County Rural 52.8 5,207 1,309
Emmet County Rural 53.8 5,010 1,078
Humboldt County Rural 52.3 5,004 1,441
Greene County Rural 55.4 4,835 755
Monona County Rural 54.8 4,723 848
Lucas County Rural 54.4 4,721 936
Palo Alto County Rural 52.6 4,686 1,368
Clarke County Rural 48.2 4,670 2,375
Howard County Rural 48.9 4,627 2,240
Davis County Rural 46.6 4,249 2,582
Worth County Rural 55.8 4,117 685
Van Buren County Rural 56.6 4,093 580
Adair County Rural 52.8 3,946 1,309
Monroe County Rural 51.7 3,900 1,591
Pocahontas County Rural 54.2 3,818 977
Fremont County Rural 57.6 3,782 478
Ida County Rural 52.3 3,630 1,441
Decatur County Rural 46.6 3,571 2,582
Wayne County Rural 52.2 3,405 1,468
Osceola County Rural 54.1 3,306 1,011
Audubon County Rural 57.1 3,210 535
Taylor County Rural 54.1 3,194 1,011
Ringgold County Rural 54.2 2,530 977
Adams County Rural 56.9 2,072 561
Notes:
Created by statecancerprofiles.cancer.gov on 07/02/2025 2:54 am.

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 40 and over, see the dictionary.

Data for United States does not include Puerto Rico.

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