Iowa counties by population provide a detailed snapshot based on the 2020 census data of the United States. There are 99 counties in Iowa that accommodate 3,190,369 residents, which is 1% of the total population in the United States. With 32.30%, Kansas has the lower education rate than the national average 35.7%. When it comes to employment rate and household income, Iowa offers the best employment rate than the national average, with $69,588 median household income.
To know more about Iowa population by county, choose any county of Iowa tells what is the total population, how dense is the population per square miles, how much population access the education, what percent of population employed, what is the median household income, what percent of population covered by health insurance and how many housing units available, in that specific county compared with Iowa (state level) and United States (nation level) population data. Similarly, the city based population details can be accessed at Iowa Cities by Population.
Which is the most populous county in Iowa?
Polk County in Iowa, USA, is the most populous county, with a resident population of 492,401 according to the 2020 US census data. With a 230,299 resident population Linn County, IA ranks as the second most populated county in the state. Scott County with a population of 174,669 residents claims the third largest county by population in Iowa.
Which is the least populous county in Iowa
Adams County with a population of 3,704 residents, is recognized as the smallest county in Iowa by population.
Iowa Counties by Population
Rank | County | Population |
1 | Polk County | 492,401 |
2 | Linn County | 230,299 |
3 | Scott County | 174,669 |
4 | Johnson County | 152,854 |
5 | Black Hawk County | 131,144 |
6 | Woodbury County | 105,941 |
7 | Dallas County | 99,678 |
8 | Dubuque County | 99,266 |
9 | Story County | 98,537 |
10 | Pottawattamie County | 93,667 |
11 | Warren County | 52,403 |
12 | Clinton County | 46,460 |
13 | Muscatine County | 43,235 |
14 | Cerro Gordo County | 43,127 |
15 | Marshall County | 40,105 |
16 | Des Moines County | 38,910 |
17 | Jasper County | 37,813 |
18 | Webster County | 36,999 |
19 | Sioux County | 35,872 |
20 | Wapello County | 35,437 |
21 | Lee County | 33,555 |
22 | Marion County | 33,414 |
23 | Boone County | 26,715 |
24 | Plymouth County | 25,698 |
25 | Benton County | 25,575 |
26 | Bremer County | 24,988 |
27 | Washington County | 22,565 |
28 | Mahaska County | 22,190 |
29 | Buena Vista County | 20,823 |
30 | Carroll County | 20,760 |
31 | Jones County | 20,646 |
32 | Buchanan County | 20,565 |
33 | Henry County | 20,482 |
34 | Winneshiek County | 20,070 |
35 | Fayette County | 19,509 |
36 | Jackson County | 19,485 |
37 | Poweshiek County | 18,662 |
38 | Cedar County | 18,505 |
39 | Dickinson County | 17,703 |
40 | Delaware County | 17,488 |
41 | Tama County | 17,135 |
42 | Clayton County | 17,043 |
43 | Hardin County | 16,878 |
44 | Iowa County | 16,662 |
45 | Madison County | 16,548 |
46 | Crawford County | 16,525 |
47 | Clay County | 16,384 |
48 | Jefferson County | 15,663 |
49 | Floyd County | 15,627 |
50 | Page County | 15,211 |
51 | Hamilton County | 15,039 |
52 | Kossuth County | 14,828 |
53 | Harrison County | 14,582 |
54 | Mills County | 14,484 |
55 | Butler County | 14,334 |
56 | O'Brien County | 14,182 |
57 | Allamakee County | 14,061 |
58 | Cass County | 13,127 |
59 | Wright County | 12,943 |
60 | Grundy County | 12,329 |
61 | Appanoose County | 12,317 |
62 | Union County | 12,138 |
63 | Chickasaw County | 12,012 |
64 | Lyon County | 11,934 |
65 | Shelby County | 11,746 |
66 | Cherokee County | 11,658 |
67 | Louisa County | 10,837 |
68 | Hancock County | 10,795 |
69 | Winnebago County | 10,679 |
70 | Guthrie County | 10,623 |
71 | Mitchell County | 10,565 |
72 | Montgomery County | 10,330 |
73 | Keokuk County | 10,033 |
74 | Franklin County | 10,019 |
75 | Calhoun County | 9,927 |
76 | Sac County | 9,814 |
77 | Clarke County | 9,748 |
78 | Humboldt County | 9,597 |
79 | Howard County | 9,469 |
80 | Emmet County | 9,388 |
81 | Davis County | 9,110 |
82 | Palo Alto County | 8,996 |
83 | Greene County | 8,771 |
84 | Monona County | 8,751 |
85 | Lucas County | 8,634 |
86 | Decatur County | 7,645 |
87 | Monroe County | 7,577 |
88 | Adair County | 7,496 |
89 | Worth County | 7,443 |
90 | Van Buren County | 7,203 |
91 | Pocahontas County | 7,078 |
92 | Ida County | 7,005 |
93 | Fremont County | 6,605 |
94 | Wayne County | 6,497 |
95 | Osceola County | 6,192 |
96 | Taylor County | 5,896 |
97 | Audubon County | 5,674 |
98 | Ringgold County | 4,663 |
99 | Adams County | 3,704 |