Ranking of Iowa Counties By Population in 2019

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2019, the Population for Iowa was 3.16M. Among all Iowa counties, Polk County had the highest population (491.03K), followed by Linn County (227.24K), and Scott County (173.40K).

The chart below shows the top 10 counties, and the table below shows the ranking of all Iowa counties.

You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.

See this for other years:
Ranking of Iowa Counties By Population in 2019
Polk
Linn
Scott
Johnson
Black Hawk
Woodbury
Story
Dubuque
Dallas
Pottawattamie
Ranking of Iowa Counties By Population in 2019
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Rank County Population
1 Polk County 491031
2 Linn County 227241
3 Scott County 173400
4 Johnson County 152480
5 Black Hawk County 131089
6 Woodbury County 103132
7 Story County 97441
8 Dubuque County 97432
9 Dallas County 93631
10 Pottawattamie County 93405
11 Warren County 51548
12 Clinton County 46559
13 Muscatine County 42571
14 Cerro Gordo County 42477
15 Marshall County 39472
16 Des Moines County 39051
17 Jasper County 37171
18 Webster County 35982
19 Wapello County 35151
20 Sioux County 34950
21 Lee County 33641
22 Marion County 33280
23 Boone County 26338
24 Benton County 25544
25 Plymouth County 25200
26 Bremer County 25170
27 Mahaska County 22429
28 Washington County 22030
29 Buchanan County 21148
30 Jones County 20634
31 Carroll County 20118
32 Winneshiek County 19992
33 Henry County 19835
34 Buena Vista County 19690
35 Fayette County 19575
36 Jackson County 19375
37 Cedar County 18541
38 Poweshiek County 18458
39 Jefferson County 18180
40 Clayton County 17497
41 Dickinson County 17290
42 Delaware County 17057
43 Tama County 16904
44 Crawford County 16903
45 Hardin County 16809
46 Madison County 16273
47 Iowa County 16146
48 Clay County 16094
49 Floyd County 15655
50 Page County 15129
51 Mills County 15124
52 Hamilton County 14797
53 Kossuth County 14769
54 Butler County 14404
55 Harrison County 14034
56 O'Brien County 13796
57 Allamakee County 13671
58 Cass County 12822
59 Wright County 12551
60 Appanoose County 12525
61 Grundy County 12227
62 Union County 12224
63 Chickasaw County 11943
64 Lyon County 11806
65 Shelby County 11479
66 Cherokee County 11231
67 Louisa County 11059
68 Guthrie County 10741
69 Hancock County 10664
70 Mitchell County 10565
71 Winnebago County 10357
72 Keokuk County 10192
73 Franklin County 10082
74 Montgomery County 9917
75 Sac County 9675
76 Calhoun County 9616
77 Humboldt County 9499
78 Clarke County 9382
79 Emmet County 9224
80 Howard County 9146
81 Davis County 9006
82 Greene County 8881
83 Palo Alto County 8873
84 Monona County 8626
85 Lucas County 8561
86 Decatur County 7852
87 Monroe County 7681
88 Worth County 7407
89 Adair County 7102
90 Van Buren County 7044
91 Fremont County 6917
92 Ida County 6822
93 Pocahontas County 6632
94 Wayne County 6413
95 Taylor County 6188
96 Osceola County 5961
97 Audubon County 5491
98 Ringgold County 4866
99 Adams County 3602