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!

Rank County Population
1 Polk County 487,204
2 Linn County 225,909
3 Scott County 173,283
4 Johnson County 151,260
5 Black Hawk County 132,408
6 Woodbury County 102,539
7 Story County 98,105
8 Dubuque County 96,854
9 Pottawattamie County 93,533
10 Dallas County 90,180
11 Warren County 51,056
12 Clinton County 46,518
13 Muscatine County 42,929
14 Cerro Gordo County 42,647
15 Marshall County 39,981
16 Des Moines County 39,138
17 Jasper County 37,147
18 Webster County 36,277
19 Wapello County 35,205
20 Sioux County 34,909
21 Lee County 34,055
22 Marion County 33,407
23 Boone County 26,346
24 Benton County 25,642
25 Plymouth County 25,095
26 Bremer County 24,947
27 Washington County 22,141
28 Mahaska County 22,000
29 Buchanan County 21,199
30 Jones County 20,744
31 Carroll County 20,154
32 Henry County 20,067
33 Winneshiek County 20,029
34 Buena Vista County 19,874
35 Fayette County 19,660
36 Jackson County 19,432
37 Poweshiek County 18,699
38 Cedar County 18,627
39 Jefferson County 18,381
40 Clayton County 17,556
41 Crawford County 17,158
42 Dickinson County 17,153
43 Delaware County 17,069
44 Tama County 16,904
45 Hardin County 16,868
46 Madison County 16,249
47 Iowa County 16,141
48 Clay County 16,134
49 Floyd County 15,761
50 Page County 15,249
51 Mills County 15,063
52 Hamilton County 14,952
53 Kossuth County 14,908
54 Butler County 14,539
55 Harrison County 14,134
56 O'Brien County 13,840
57 Allamakee County 13,832
58 Cass County 12,930
59 Wright County 12,690
60 Appanoose County 12,437
61 Union County 12,359
62 Grundy County 12,304
63 Chickasaw County 11,964
64 Lyon County 11,811
65 Shelby County 11,578
66 Cherokee County 11,321
67 Louisa County 11,169
68 Guthrie County 10,720
69 Hancock County 10,712
70 Mitchell County 10,569
71 Winnebago County 10,518
72 Keokuk County 10,225
73 Franklin County 10,124
74 Montgomery County 10,003
75 Sac County 9,719
76 Calhoun County 9,699
77 Humboldt County 9,547
78 Clarke County 9,423
79 Emmet County 9,253
80 Howard County 9,187
81 Davis County 9,017
82 Greene County 8,981
83 Palo Alto County 8,929
84 Monona County 8,679
85 Lucas County 8,645
86 Decatur County 7,890
87 Monroe County 7,790
88 Worth County 7,453
89 Adair County 7,063
90 Van Buren County 7,020
91 Fremont County 6,993
92 Ida County 6,841
93 Pocahontas County 6,740
94 Wayne County 6,401
95 Taylor County 6,191
96 Osceola County 6,040
97 Audubon County 5,506
98 Ringgold County 4,968
99 Adams County 3,645

United States Census Bureau. B01001 SEX BY AGE, 2017 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 6 December 2018. http://www.census.gov/.

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/.

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