Iowa / Counties by Population

Iowa Counties by Population

The data is from the US Census. Below are 99 Iowa counties ranked 1 through 99 . 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 490,161
2 Linn County 226,706
3 Scott County 172,943
4 Johnson County 151,140
5 Black Hawk County 131,228
6 Woodbury County 103,107
7 Dubuque County 97,311
8 Story County 97,117
9 Dallas County 93,453
10 Pottawattamie County 93,206
11 Warren County 51,466
12 Clinton County 46,429
13 Muscatine County 42,664
14 Cerro Gordo County 42,450
15 Marshall County 39,369
16 Des Moines County 38,967
17 Jasper County 37,185
18 Webster County 35,904
19 Wapello County 34,969
20 Sioux County 34,855
21 Lee County 33,657
22 Marion County 33,253
23 Boone County 26,234
24 Benton County 25,645
25 Plymouth County 25,177
26 Bremer County 25,062
27 Mahaska County 22,095
28 Washington County 21,965
29 Buchanan County 21,175
30 Jones County 20,681
31 Carroll County 20,165
32 Winneshiek County 19,991
33 Henry County 19,954
34 Fayette County 19,650
35 Buena Vista County 19,620
36 Jackson County 19,439
37 Cedar County 18,627
38 Poweshiek County 18,504
39 Jefferson County 18,295
40 Clayton County 17,549
41 Dickinson County 17,258
42 Delaware County 17,011
43 Tama County 16,854
44 Hardin County 16,846
45 Crawford County 16,820
46 Madison County 16,338
47 Iowa County 16,184
48 Clay County 16,016
49 Floyd County 15,642
50 Mills County 15,109
51 Page County 15,107
52 Kossuth County 14,813
53 Hamilton County 14,773
54 Butler County 14,439
55 Harrison County 14,049
56 O'Brien County 13,753
57 Allamakee County 13,687
58 Cass County 12,836
59 Wright County 12,562
60 Appanoose County 12,426
61 Union County 12,241
62 Grundy County 12,232
63 Chickasaw County 11,933
64 Lyon County 11,755
65 Shelby County 11,454
66 Cherokee County 11,235
67 Louisa County 11,035
68 Guthrie County 10,689
69 Hancock County 10,630
70 Mitchell County 10,586
71 Winnebago County 10,354
72 Keokuk County 10,246
73 Franklin County 10,070
74 Montgomery County 9,917
75 Sac County 9,721
76 Calhoun County 9,668
77 Humboldt County 9,558
78 Clarke County 9,395
79 Emmet County 9,208
80 Howard County 9,158
81 Davis County 9,000
82 Greene County 8,888
83 Palo Alto County 8,886
84 Monona County 8,615
85 Lucas County 8,600
86 Decatur County 7,870
87 Monroe County 7,707
88 Worth County 7,381
89 Adair County 7,152
90 Van Buren County 7,044
91 Fremont County 6,960
92 Ida County 6,860
93 Pocahontas County 6,619
94 Wayne County 6,441
95 Taylor County 6,121
96 Osceola County 5,958
97 Audubon County 5,496
98 Ringgold County 4,894
99 Adams County 3,602

United States Census Bureau. B01001 SEX BY AGE, 2018 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 19 December 2019. http://www.census.gov/.

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2019. U.S. Census Bureau, Population Division. Web. May 2020. http://www.census.gov/.

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