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.

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Rank County Population
1 Polk County 479,612
2 Linn County 223,861
3 Scott County 172,446
4 Johnson County 148,577
5 Black Hawk County 132,393
6 Woodbury County 102,586
7 Dubuque County 96,982
8 Story County 96,941
9 Pottawattamie County 93,393
10 Dallas County 87,099
11 Warren County 50,076
12 Clinton County 46,909
13 Muscatine County 42,889
14 Cerro Gordo County 42,834
15 Marshall County 39,964
16 Des Moines County 39,386
17 Jasper County 36,971
18 Webster County 36,545
19 Wapello County 35,141
20 Sioux County 34,827
21 Lee County 34,227
22 Marion County 33,172
23 Boone County 26,370
24 Benton County 25,636
25 Plymouth County 25,068
26 Bremer County 24,864
27 Mahaska County 22,164
28 Washington County 22,100
29 Buchanan County 21,118
30 Jones County 20,559
31 Carroll County 20,281
32 Winneshiek County 20,262
33 Buena Vista County 20,058
34 Henry County 19,941
35 Fayette County 19,803
36 Jackson County 19,401
37 Cedar County 18,457
38 Poweshiek County 18,388
39 Jefferson County 18,148
40 Clayton County 17,625
41 Delaware County 17,183
42 Dickinson County 17,127
43 Hardin County 17,061
44 Crawford County 17,034
45 Tama County 17,032
46 Clay County 16,211
47 Iowa County 16,189
48 Madison County 16,012
49 Floyd County 15,786
50 Page County 15,268
51 Mills County 15,034
52 Hamilton County 14,997
53 Kossuth County 14,978
54 Butler County 14,628
55 Harrison County 14,089
56 O'Brien County 13,835
57 Allamakee County 13,813
58 Cass County 13,091
59 Wright County 12,739
60 Appanoose County 12,452
61 Union County 12,358
62 Grundy County 12,299
63 Chickasaw County 12,026
64 Lyon County 11,776
65 Shelby County 11,606
66 Cherokee County 11,343
67 Louisa County 11,178
68 Hancock County 10,802
69 Guthrie County 10,669
70 Mitchell County 10,608
71 Winnebago County 10,534
72 Keokuk County 10,188
73 Franklin County 10,162
74 Montgomery County 10,053
75 Sac County 9,802
76 Calhoun County 9,744
77 Humboldt County 9,554
78 Emmet County 9,438
79 Clarke County 9,360
80 Howard County 9,226
81 Palo Alto County 9,003
82 Greene County 8,950
83 Davis County 8,920
84 Monona County 8,730
85 Lucas County 8,583
86 Decatur County 7,979
87 Monroe County 7,807
88 Worth County 7,445
89 Van Buren County 7,150
90 Adair County 7,085
91 Fremont County 6,946
92 Ida County 6,901
93 Pocahontas County 6,797
94 Wayne County 6,429
95 Taylor County 6,167
96 Osceola County 6,052
97 Audubon County 5,571
98 Ringgold County 4,964
99 Adams County 3,670

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/.

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