Iowa / Counties by Population

Iowa Counties by Population

Below are the 99 Iowa counties sorted by population from 1 to 99 . The population data are from the 2021 Population Estimates Program and 2020 American Community Survey. You can copy and paste this list directly into your favorite spreadsheet program. Don't you just adore lovely numbers listed nicely in columns & rows? We do!

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Rank County Population
1 Polk County 496,844
2 Linn County 228,939
3 Scott County 174,170
4 Johnson County 154,748
5 Black Hawk County 130,368
6 Woodbury County 105,607
7 Dallas County 103,796
8 Story County 99,472
9 Dubuque County 98,718
10 Pottawattamie County 93,304
11 Warren County 53,402
12 Clinton County 46,463
13 Cerro Gordo County 42,706
14 Muscatine County 42,688
15 Marshall County 39,853
16 Des Moines County 38,491
17 Jasper County 37,764
18 Webster County 37,147
19 Sioux County 35,893
20 Wapello County 35,256
21 Marion County 33,380
22 Lee County 33,215
23 Boone County 26,723
24 Benton County 25,691
25 Plymouth County 25,650
26 Bremer County 25,081
27 Washington County 22,491
28 Mahaska County 21,984
29 Jones County 20,805
30 Buena Vista County 20,771
31 Carroll County 20,692
32 Buchanan County 20,657
33 Henry County 20,387
34 Winneshiek County 19,892
35 Jackson County 19,368
36 Fayette County 19,258
37 Poweshiek County 18,586
38 Cedar County 18,410
39 Dickinson County 17,851
40 Delaware County 17,510
41 Clayton County 16,998
42 Tama County 16,867
43 Madison County 16,773
44 Hardin County 16,708
45 Iowa County 16,568
46 Clay County 16,440
47 Crawford County 16,193
48 Jefferson County 15,647
49 Floyd County 15,413
50 Page County 15,197
51 Hamilton County 14,887
52 Harrison County 14,669
53 Kossuth County 14,529
54 Mills County 14,465
55 Butler County 14,332
56 O'Brien County 14,015
57 Allamakee County 13,926
58 Cass County 13,050
59 Wright County 12,785
60 Grundy County 12,347
61 Appanoose County 12,257
62 Union County 12,018
63 Lyon County 12,011
64 Chickasaw County 11,887
65 Shelby County 11,770
66 Cherokee County 11,503
67 Louisa County 10,749
68 Hancock County 10,663
69 Winnebago County 10,656
70 Guthrie County 10,567
71 Mitchell County 10,555
72 Montgomery County 10,322
73 Franklin County 9,952
74 Calhoun County 9,915
75 Keokuk County 9,914
76 Clarke County 9,785
77 Sac County 9,752
78 Humboldt County 9,634
79 Howard County 9,478
80 Emmet County 9,321
81 Davis County 9,138
82 Palo Alto County 8,906
83 Greene County 8,717
84 Lucas County 8,710
85 Monona County 8,574
86 Decatur County 7,659
87 Monroe County 7,610
88 Adair County 7,541
89 Worth County 7,385
90 Van Buren County 7,243
91 Pocahontas County 7,074
92 Ida County 6,956
93 Fremont County 6,567
94 Wayne County 6,508
95 Osceola County 6,159
96 Taylor County 5,868
97 Audubon County 5,635
98 Ringgold County 4,639
99 Adams County 3,641

United States Census Bureau. B01001 SEX BY AGE, 2020 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 17 March 2022. http://www.census.gov/.

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2021. U.S. Census Bureau, Population Division. Web. May 2022. http://www.census.gov/.

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