Population in Iowa by County

Total population.

U.S. Census Bureau · ACS 5-year 2020-2024 · Updated November 2026

Iowa

3,210,507

Counties

99

Highest

Polk

503,175

Lowest

Adams

3,622

All Iowa counties, ranked

# Counties Population
1 Polk 503,175
2 Linn 230,004
3 Scott 174,608
4 Johnson 156,639
5 Black Hawk 131,049
6 Dallas 107,968
7 Woodbury 106,247
8 Story 100,466
9 Dubuque 99,030
10 Pottawattamie 93,424
11 Warren 54,409
12 Clinton 46,268
13 Cerro Gordo 42,632
14 Muscatine 42,559
15 Marshall 40,114
16 Des Moines 38,487
17 Jasper 37,954
18 Webster 36,886
19 Sioux 36,212
20 Wapello 35,362
21 Marion 33,642
22 Lee 32,893
23 Boone 26,668
24 Plymouth 25,747
25 Benton 25,724
26 Bremer 25,204
27 Washington 22,561
28 Mahaska 22,021
29 Jones 20,896
30 Buena Vista 20,753
31 Buchanan 20,694
32 Carroll 20,594
33 Henry 20,004
34 Winneshiek 19,873
35 Jackson 19,390
36 Fayette 19,288
37 Poweshiek 18,545
38 Cedar 18,349
39 Dickinson 17,990
40 Delaware 17,558
41 Clayton 17,013
42 Madison 16,926
43 Tama 16,868
44 Hardin 16,639
45 Iowa 16,507
46 Clay 16,461
47 Crawford 16,277
48 Jefferson 15,705
49 Floyd 15,328
50 Page 15,131
51 Hamilton 14,886
52 Harrison 14,632
53 Mills 14,568
54 Kossuth 14,516
55 Butler 14,268
56 O'Brien 14,126
57 Allamakee 14,092
58 Cass 13,096
59 Wright 12,791
60 Grundy 12,384
61 Appanoose 12,184
62 Lyon 12,162
63 Union 11,993
64 Chickasaw 11,807
65 Shelby 11,778
66 Cherokee 11,600
67 Guthrie 10,688
68 Louisa 10,678
69 Hancock 10,671
70 Winnebago 10,583
71 Mitchell 10,575
72 Montgomery 10,214
73 Franklin 9,956
74 Keokuk 9,924
75 Calhoun 9,803
76 Sac 9,689
77 Clarke 9,662
78 Humboldt 9,591
79 Howard 9,445
80 Emmet 9,262
81 Davis 9,157
82 Palo Alto 8,863
83 Lucas 8,716
84 Greene 8,688
85 Monona 8,557
86 Decatur 7,759
87 Monroe 7,513
88 Adair 7,460
89 Worth 7,350
90 Van Buren 7,241
91 Pocahontas 7,046
92 Ida 6,911
93 Wayne 6,532
94 Fremont 6,514
95 Osceola 6,100
96 Taylor 5,868
97 Audubon 5,599
98 Ringgold 4,645
99 Adams 3,622

About this dataset

Total population. Source: ACS 5-year 2020-2024 Data Profile, variable DP05_0001E. Values in people.

Source
U.S. Census Bureau
Citation
U.S. Census Bureau, American Community Survey 5-Year Estimates Data Profiles (2020-2024), DP05_0001E
Vintage
ACS 5-year 2020-2024
License
Public domain (U.S. Census Bureau)
Unit
people
Available at
State · County · ZIP code
Territory roll-up
Summed across each territory
Last loaded
November 2026

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Population by county in other states

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US Population nationwide