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QuickFacts

Johnson County, Iowa; Franklin County, Iowa; Mitchell County, Iowa

QuickFacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more.

Chart

Population Estimates, July 1 2021, (V2021)

0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
500,000
Johnson County, Iowa
154,748
Franklin County, Iowa
9,952
Mitchell County, Iowa
10,555
Adair County, Iowa
7,541
Adams County, Iowa
3,641
Allamakee County, Iowa
13,926
Appanoose County, Iowa
12,257
Audubon County, Iowa
5,635
Benton County, Iowa
25,691
Black Hawk County, Iowa
130,368
Boone County, Iowa
26,723
Bremer County, Iowa
25,081
Buchanan County, Iowa
20,657
Buena Vista County, Iowa
20,771
Butler County, Iowa
14,332
Calhoun County, Iowa
9,915
Carroll County, Iowa
20,692
Cass County, Iowa
13,050
Cedar County, Iowa
18,410
Cerro Gordo County, Iowa
42,706
Cherokee County, Iowa
11,503
Chickasaw County, Iowa
11,887
Clarke County, Iowa
9,785
Clay County, Iowa
16,440
Clayton County, Iowa
16,998
Clinton County, Iowa
46,463
Crawford County, Iowa
16,193
Dallas County, Iowa
103,796
Davis County, Iowa
9,138
Decatur County, Iowa
7,659
Delaware County, Iowa
17,510
Des Moines County, Iowa
38,491
Dickinson County, Iowa
17,851
Dubuque County, Iowa
98,718
Emmet County, Iowa
9,321
Fayette County, Iowa
19,258
Floyd County, Iowa
15,413
Fremont County, Iowa
6,567
Greene County, Iowa
8,717
Grundy County, Iowa
12,347
Guthrie County, Iowa
10,567
Hamilton County, Iowa
14,887
Hancock County, Iowa
10,663
Hardin County, Iowa
16,708
Harrison County, Iowa
14,669
Henry County, Iowa
20,387
Howard County, Iowa
9,478
Humboldt County, Iowa
9,634
Ida County, Iowa
6,956
Iowa County, Iowa
16,568
Jackson County, Iowa
19,368
Jasper County, Iowa
37,764
Jefferson County, Iowa
15,647
Jones County, Iowa
20,805
Keokuk County, Iowa
9,914
Kossuth County, Iowa
14,529
Lee County, Iowa
33,215
Linn County, Iowa
228,939
Louisa County, Iowa
10,749
Lucas County, Iowa
8,710
Lyon County, Iowa
12,011
Madison County, Iowa
16,773
Mahaska County, Iowa
21,984
Marion County, Iowa
33,380
Marshall County, Iowa
39,853
Mills County, Iowa
14,465
Monona County, Iowa
8,574
Monroe County, Iowa
7,610
Montgomery County, Iowa
10,322
Muscatine County, Iowa
42,688
O'Brien County, Iowa
14,015
Osceola County, Iowa
6,159
Page County, Iowa
15,197
Palo Alto County, Iowa
8,906
Plymouth County, Iowa
25,650
Pocahontas County, Iowa
7,074
Polk County, Iowa
496,844
Pottawattamie County, Iowa
93,304
Poweshiek County, Iowa
18,586
Ringgold County, Iowa
4,639
Sac County, Iowa
9,752
Scott County, Iowa
174,170
Shelby County, Iowa
11,770
Sioux County, Iowa
35,893
Story County, Iowa
99,472
Tama County, Iowa
16,867
Taylor County, Iowa
5,868
Union County, Iowa
12,018
Van Buren County, Iowa
7,243
Wapello County, Iowa
35,256
Warren County, Iowa
53,402
Washington County, Iowa
22,491
Wayne County, Iowa
6,508
Webster County, Iowa
37,147
Winnebago County, Iowa
10,656
Winneshiek County, Iowa
19,892
Woodbury County, Iowa
105,607
Worth County, Iowa
7,385
Wright County, Iowa
12,785
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
500,000
Value Notes

Estimates are not comparable to other geographic levels due to methodology differences that may exist between different data sources.

Some estimates presented here come from sample data, and thus have sampling errors that may render some apparent differences between geographies statistically indistinguishable. Click the Quick Info icon to the left of each row in TABLE view to learn about sampling error.

The vintage year (e.g., V2021) refers to the final year of the series (2020 thru 2021). Different vintage years of estimates are not comparable.

Users should exercise caution when comparing 2016-2020 ACS 5-year estimates to other ACS estimates. For more information, please visit the 2020 5-year ACS Comparison Guidance page.

Fact Notes Value Flags

QuickFacts data are derived from: Population Estimates, American Community Survey, Census of Population and Housing, Current Population Survey, Small Area Health Insurance Estimates, Small Area Income and Poverty Estimates, State and County Housing Unit Estimates, County Business Patterns, Nonemployer Statistics, Economic Census, Survey of Business Owners, Building Permits.

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