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 2020 Census Redistricting dataset. If 2020 Census data are not available for a geography, then the population data are from the Census’ 2019 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 492,401
2 Linn County 230,299
3 Scott County 174,669
4 Johnson County 152,854
5 Black Hawk County 131,144
6 Woodbury County 105,941
7 Dallas County 99,678
8 Dubuque County 99,266
9 Story County 98,537
10 Pottawattamie County 93,667
11 Warren County 52,403
12 Clinton County 46,460
13 Muscatine County 43,235
14 Cerro Gordo County 43,127
15 Marshall County 40,105
16 Des Moines County 38,910
17 Jasper County 37,813
18 Webster County 36,999
19 Sioux County 35,872
20 Wapello County 35,437
21 Lee County 33,555
22 Marion County 33,414
23 Boone County 26,715
24 Plymouth County 25,698
25 Benton County 25,575
26 Bremer County 24,988
27 Washington County 22,565
28 Mahaska County 22,190
29 Buena Vista County 20,823
30 Carroll County 20,760
31 Jones County 20,646
32 Buchanan County 20,565
33 Henry County 20,482
34 Winneshiek County 20,070
35 Fayette County 19,509
36 Jackson County 19,485
37 Poweshiek County 18,662
38 Cedar County 18,505
39 Dickinson County 17,703
40 Delaware County 17,488
41 Tama County 17,135
42 Clayton County 17,043
43 Hardin County 16,878
44 Iowa County 16,662
45 Madison County 16,548
46 Crawford County 16,525
47 Clay County 16,384
48 Jefferson County 15,663
49 Floyd County 15,627
50 Page County 15,211
51 Hamilton County 15,039
52 Kossuth County 14,828
53 Harrison County 14,582
54 Mills County 14,484
55 Butler County 14,334
56 O'Brien County 14,182
57 Allamakee County 14,061
58 Cass County 13,127
59 Wright County 12,943
60 Grundy County 12,329
61 Appanoose County 12,317
62 Union County 12,138
63 Chickasaw County 12,012
64 Lyon County 11,934
65 Shelby County 11,746
66 Cherokee County 11,658
67 Louisa County 10,837
68 Hancock County 10,795
69 Winnebago County 10,679
70 Guthrie County 10,623
71 Mitchell County 10,565
72 Montgomery County 10,330
73 Keokuk County 10,033
74 Franklin County 10,019
75 Calhoun County 9,927
76 Sac County 9,814
77 Clarke County 9,748
78 Humboldt County 9,597
79 Howard County 9,469
80 Emmet County 9,388
81 Davis County 9,110
82 Palo Alto County 8,996
83 Greene County 8,771
84 Monona County 8,751
85 Lucas County 8,634
86 Decatur County 7,645
87 Monroe County 7,577
88 Adair County 7,496
89 Worth County 7,443
90 Van Buren County 7,203
91 Pocahontas County 7,078
92 Ida County 7,005
93 Fremont County 6,605
94 Wayne County 6,497
95 Osceola County 6,192
96 Taylor County 5,896
97 Audubon County 5,674
98 Ringgold County 4,663
99 Adams County 3,704

United States Census Bureau. B01001 SEX BY AGE, 2019 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 10 December 2020. http://www.census.gov/.

United States Census Bureau. "P2 Hispanic or Latino, and Not Hispanic or Latino by Race." 2020 Census State Redistricting Data (Public Law 94-171) Summary File. U.S. Census Bureau, 2020 Census. Web. 12 August 2021. https://www.census.gov/.

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