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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 Value

County
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2023 Rural-Urban Continuum Codes Φ
 sort by rural urban descending
Value (Percent)
 sort by value descending
People (Age 40 And Over)
 sort by sample size ascending
Rank within US
(of 3143 counties)
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Iowa N/A 48.2 1,539,086 33 of 52
United States N/A 48.3 160,683,909 N/A
Story County Urban 34.9 34,448 3,116
Johnson County Urban 38.4 59,413 3,067
Dallas County Urban 42.8 44,564 2,903
Sioux County Rural 43.5 15,659 2,858
Buena Vista County Rural 44.0 9,098 2,823
Polk County Urban 44.2 219,996 2,811
Black Hawk County Urban 44.6 58,330 2,788
Woodbury County Urban 45.6 48,204 2,697
Davis County Rural 46.6 4,249 2,582
Decatur County Rural 46.6 3,571 2,582
Lyon County Rural 47.1 5,696 2,522
Bremer County Urban 48.1 12,087 2,398
Warren County Urban 48.1 25,744 2,398
Clarke County Rural 48.2 4,670 2,375
Dubuque County Urban 48.2 47,679 2,375
Linn County Urban 48.2 110,685 2,375
Marshall County Rural 48.4 19,360 2,334
Crawford County Rural 48.7 7,937 2,283
Muscatine County Rural 48.7 20,833 2,283
Scott County Urban 48.7 84,841 2,283
Howard County Rural 48.9 4,627 2,240
Mahaska County Rural 49.0 10,810 2,224
O'Brien County Rural 49.6 7,000 2,089
Marion County Rural 49.7 16,683 2,071
Webster County Rural 49.7 18,328 2,071
Wright County Rural 49.7 6,370 2,071
Buchanan County Rural 49.8 10,285 2,045
Wapello County Rural 49.9 17,592 2,023
Pottawattamie County Urban 50.2 46,895 1,964
Washington County Urban 50.4 11,356 1,909
Henry County Rural 50.6 10,232 1,867
Union County Rural 50.8 6,120 1,823
Plymouth County Rural 50.9 13,083 1,802
Poweshiek County Rural 51.1 9,495 1,751
Madison County Urban 51.4 8,612 1,669
Tama County Rural 51.6 8,755 1,629
Jasper County Urban 51.7 19,565 1,591
Monroe County Rural 51.7 3,900 1,591
Winnebago County Rural 51.7 5,500 1,591
Grundy County Urban 51.9 6,407 1,542
Harrison County Urban 52.1 7,633 1,497
Clay County Rural 52.2 8,583 1,468
Wayne County Rural 52.2 3,405 1,468
Humboldt County Rural 52.3 5,004 1,441
Ida County Rural 52.3 3,630 1,441
Mitchell County Rural 52.5 5,533 1,392
Boone County Urban 52.6 14,021 1,368
Palo Alto County Rural 52.6 4,686 1,368
Carroll County Rural 52.7 10,898 1,343
Franklin County Rural 52.7 5,259 1,343
Adair County Rural 52.8 3,946 1,309
Calhoun County Rural 52.8 5,207 1,309
Des Moines County Rural 52.8 20,385 1,309
Clinton County Rural 53.0 24,564 1,255
Hamilton County Rural 53.0 7,891 1,255
Iowa County Rural 53.0 8,762 1,255
Louisa County Rural 53.0 5,678 1,255
Winneshiek County Rural 53.0 10,577 1,255
Benton County Urban 53.3 13,701 1,189
Keokuk County Rural 53.3 5,312 1,189
Mills County Urban 53.4 7,781 1,162
Fayette County Rural 53.5 10,367 1,137
Allamakee County Rural 53.6 7,524 1,120
Emmet County Rural 53.8 5,010 1,078
Cedar County Rural 53.9 9,935 1,056
Osceola County Rural 54.1 3,306 1,011
Taylor County Rural 54.1 3,194 1,011
Pocahontas County Rural 54.2 3,818 977
Ringgold County Rural 54.2 2,530 977
Delaware County Rural 54.3 9,524 959
Chickasaw County Rural 54.4 6,451 936
Jefferson County Rural 54.4 8,528 936
Lucas County Rural 54.4 4,721 936
Appanoose County Rural 54.5 6,677 912
Floyd County Rural 54.5 8,450 912
Kossuth County Rural 54.5 7,968 912
Montgomery County Rural 54.6 5,594 889
Butler County Rural 54.7 7,821 870
Cerro Gordo County Rural 54.7 23,388 870
Cass County Rural 54.8 7,192 848
Jackson County Rural 54.8 10,644 848
Lee County Rural 54.8 18,170 848
Monona County Rural 54.8 4,723 848
Shelby County Rural 54.8 6,443 848
Jones County Urban 55.1 11,456 797
Sac County Rural 55.3 5,397 770
Greene County Rural 55.4 4,835 755
Page County Rural 55.7 8,447 696
Worth County Rural 55.8 4,117 685
Hancock County Rural 55.9 5,991 666
Hardin County Rural 56.2 9,406 630
Van Buren County Rural 56.6 4,093 580
Adams County Rural 56.9 2,072 561
Clayton County Rural 57.0 9,723 548
Audubon County Rural 57.1 3,210 535
Cherokee County Rural 57.6 6,669 478
Fremont County Rural 57.6 3,782 478
Guthrie County Urban 57.7 6,138 465
Dickinson County Rural 59.6 10,637 288
Notes:
Created by statecancerprofiles.cancer.gov on 07/03/2025 9:56 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 40 and over, see the dictionary.

Data for United States does not include Puerto Rico.

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