Ranking of Iowa Counties By Population in 2017

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2017, the Population for Iowa was 3.14M. Among all Iowa counties, Polk County had the highest population (480.96K), followed by Linn County (224.55K), and Scott County (172.69K).

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 2017
Polk
Linn
Scott
Johnson
Black Hawk
Woodbury
Story
Dubuque
Pottawattamie
Dallas
Ranking of Iowa Counties By Population in 2017
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Rank County Population
1 Polk County 480962
2 Linn County 224553
3 Scott County 172691
4 Johnson County 149703
5 Black Hawk County 132278
6 Woodbury County 102098
7 Story County 97335
8 Dubuque County 97162
9 Pottawattamie County 93563
10 Dallas County 87219
11 Warren County 50087
12 Clinton County 46926
13 Cerro Gordo County 43030
14 Muscatine County 42825
15 Marshall County 40051
16 Des Moines County 39400
17 Jasper County 36997
18 Webster County 36650
19 Wapello County 35043
20 Sioux County 34784
21 Lee County 34239
22 Marion County 33107
23 Boone County 26498
24 Benton County 25651
25 Plymouth County 25053
26 Bremer County 24861
27 Mahaska County 22422
28 Washington County 22236
29 Buchanan County 21133
30 Jones County 20610
31 Carroll County 20256
32 Buena Vista County 20154
33 Winneshiek County 20140
34 Henry County 20056
35 Fayette County 19680
36 Jackson County 19377
37 Cedar County 18488
38 Poweshiek County 18359
39 Jefferson County 18108
40 Clayton County 17647
41 Dickinson County 17167
42 Delaware County 17139
43 Hardin County 17076
44 Crawford County 17065
45 Tama County 17040
46 Clay County 16151
47 Iowa County 16139
48 Madison County 16005
49 Floyd County 15778
50 Page County 15253
51 Mills County 15060
52 Hamilton County 15034
53 Kossuth County 14935
54 Butler County 14593
55 Harrison County 14116
56 Allamakee County 13812
57 O'Brien County 13777
58 Cass County 13155
59 Wright County 12758
60 Union County 12472
61 Appanoose County 12367
62 Grundy County 12296
63 Chickasaw County 12008
64 Lyon County 11791
65 Shelby County 11584
66 Cherokee County 11315
67 Louisa County 11203
68 Hancock County 10762
69 Guthrie County 10652
70 Winnebago County 10582
71 Mitchell County 10544
72 Franklin County 10150
73 Keokuk County 10144
74 Montgomery County 10119
75 Sac County 9797
76 Calhoun County 9730
77 Humboldt County 9568
78 Emmet County 9428
79 Clarke County 9395
80 Howard County 9235
81 Palo Alto County 9045
82 Davis County 8969
83 Greene County 8959
84 Monona County 8721
85 Lucas County 8537
86 Decatur County 7956
87 Monroe County 7782
88 Worth County 7456
89 Van Buren County 7155
90 Adair County 7047
91 Fremont County 6927
92 Ida County 6864
93 Pocahontas County 6830
94 Wayne County 6488
95 Taylor County 6113
96 Osceola County 6024
97 Audubon County 5550
98 Ringgold County 5029
99 Adams County 3655