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 474,274
2 Linn County 222,121
3 Scott County 172,288
4 Johnson County 147,001
5 Black Hawk County 133,009
6 Woodbury County 102,398
7 Story County 96,922
8 Dubuque County 96,802
9 Pottawattamie County 93,503
10 Dallas County 84,002
11 Warren County 49,361
12 Clinton County 47,218
13 Cerro Gordo County 42,984
14 Muscatine County 42,950
15 Marshall County 40,271
16 Des Moines County 39,600
17 Jasper County 36,891
18 Webster County 36,757
19 Wapello County 35,315
20 Sioux County 34,825
21 Lee County 34,541
22 Marion County 33,207
23 Boone County 26,399
24 Benton County 25,626
25 Plymouth County 25,039
26 Bremer County 24,782
27 Mahaska County 22,208
28 Washington County 22,143
29 Buchanan County 21,125
30 Jones County 20,568
31 Winneshiek County 20,401
32 Carroll County 20,344
33 Buena Vista County 20,260
34 Fayette County 19,929
35 Henry County 19,926
36 Jackson County 19,395
37 Poweshiek County 18,605
38 Cedar County 18,445
39 Jefferson County 18,077
40 Clayton County 17,672
41 Delaware County 17,258
42 Tama County 17,136
43 Crawford County 17,132
44 Hardin County 17,127
45 Dickinson County 17,056
46 Clay County 16,313
47 Iowa County 16,207
48 Madison County 15,890
49 Floyd County 15,858
50 Page County 15,363
51 Hamilton County 15,110
52 Kossuth County 15,075
53 Mills County 14,957
54 Butler County 14,735
55 Harrison County 14,143
56 O'Brien County 13,911
57 Allamakee County 13,880
58 Cass County 13,191
59 Wright County 12,804
60 Appanoose County 12,510
61 Union County 12,453
62 Grundy County 12,341
63 Chickasaw County 12,099
64 Lyon County 11,769
65 Shelby County 11,694
66 Cherokee County 11,468
67 Louisa County 11,223
68 Hancock County 10,888
69 Guthrie County 10,674
70 Mitchell County 10,631
71 Winnebago County 10,571
72 Franklin County 10,245
73 Keokuk County 10,200
74 Montgomery County 10,155
75 Sac County 9,868
76 Calhoun County 9,780
77 Humboldt County 9,566
78 Emmet County 9,551
79 Clarke County 9,282
80 Howard County 9,264
81 Palo Alto County 9,055
82 Greene County 9,003
83 Davis County 8,885
84 Monona County 8,796
85 Lucas County 8,597
86 Decatur County 8,044
87 Monroe County 7,863
88 Worth County 7,489
89 Van Buren County 7,223
90 Adair County 7,124
91 Fremont County 6,968
92 Ida County 6,916
93 Pocahontas County 6,898
94 Wayne County 6,413
95 Taylor County 6,201
96 Osceola County 6,115
97 Audubon County 5,637
98 Ringgold County 4,984
99 Adams County 3,726

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2018. U.S. Census Bureau, Population Division. Web. May 2019. http://www.census.gov/.

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/.

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