Ranking of Iowa Counties By Population Density from Census 2020
Updated on October 17, 2023.
According to the data from the US 2020 Census, as at April 2020, among all Iowa counties, Polk County had the highest population density per square mile (860.54 people per sqr mile), followed by Scott County (381.29 people per sqr mile), and Linn County (321.17 people per sqr mile).
On the other hand, Ringgold County had the lowest population density (8.71 people per sqr mile), followed by Adams County (8.75 people per sqr mile), and Taylor County (11.09 people per sqr mile).
The chart below shows the top 10 counties with high population density, and the table below shows the ranking of all Iowa counties.
You can also see similar ranking of counties information for other states as well as for all counties in the United States.
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Related Topics: Iowa Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Iowa Counties By Population Density from Census 2020
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| Rank | County | Population Density |
|---|---|---|
| 1 | Polk County | 860.54 |
| 2 | Scott County | 381.29 |
| 3 | Linn County | 321.17 |
| 4 | Johnson County | 249.35 |
| 5 | Black Hawk County | 231.80 |
| 6 | Story County | 172.10 |
| 7 | Dallas County | 169.43 |
| 8 | Dubuque County | 163.19 |
| 9 | Woodbury County | 121.37 |
| 10 | Muscatine County | 98.84 |
| 11 | Pottawattamie County | 98.47 |
| 12 | Des Moines County | 93.51 |
| 13 | Warren County | 91.96 |
| 14 | Wapello County | 82.06 |
| 15 | Cerro Gordo County | 75.89 |
| 16 | Marshall County | 70.05 |
| 17 | Clinton County | 66.85 |
| 18 | Lee County | 64.83 |
| 19 | Marion County | 60.26 |
| 20 | Bremer County | 57.38 |
| 21 | Jasper County | 51.77 |
| 22 | Webster County | 51.70 |
| 23 | Henry County | 47.16 |
| 24 | Boone County | 46.83 |
| 25 | Sioux County | 46.71 |
| 26 | Dickinson County | 46.52 |
| 27 | Washington County | 39.67 |
| 28 | Mahaska County | 38.87 |
| 29 | Carroll County | 36.46 |
| 30 | Buena Vista County | 36.22 |
| 31 | Buchanan County | 36.01 |
| 32 | Jefferson County | 35.96 |
| 33 | Jones County | 35.87 |
| 34 | Benton County | 35.71 |
| 35 | Mills County | 33.11 |
| 36 | Cedar County | 31.94 |
| 37 | Poweshiek County | 31.91 |
| 38 | Floyd County | 31.22 |
| 39 | Jackson County | 30.64 |
| 40 | Delaware County | 30.27 |
| 41 | Plymouth County | 29.78 |
| 42 | Hardin County | 29.65 |
| 43 | Madison County | 29.50 |
| 44 | Winneshiek County | 29.09 |
| 45 | Clay County | 28.88 |
| 46 | Union County | 28.65 |
| 47 | Page County | 28.44 |
| 48 | Iowa County | 28.41 |
| 49 | Louisa County | 26.97 |
| 50 | Fayette County | 26.70 |
| 51 | Winnebago County | 26.67 |
| 52 | Hamilton County | 26.08 |
| 53 | Appanoose County | 24.77 |
| 54 | O'Brien County | 24.75 |
| 55 | Butler County | 24.71 |
| 56 | Grundy County | 24.57 |
| 57 | Montgomery County | 24.36 |
| 58 | Chickasaw County | 23.82 |
| 59 | Tama County | 23.77 |
| 60 | Emmet County | 23.71 |
| 61 | Cass County | 23.26 |
| 62 | Crawford County | 23.14 |
| 63 | Clarke County | 22.61 |
| 64 | Mitchell County | 22.51 |
| 65 | Wright County | 22.30 |
| 66 | Humboldt County | 22.09 |
| 67 | Allamakee County | 22.00 |
| 68 | Clayton County | 21.89 |
| 69 | Harrison County | 20.93 |
| 70 | Lyon County | 20.31 |
| 71 | Cherokee County | 20.21 |
| 72 | Lucas County | 20.05 |
| 73 | Howard County | 20.01 |
| 74 | Shelby County | 19.88 |
| 75 | Hancock County | 18.91 |
| 76 | Worth County | 18.60 |
| 77 | Davis County | 18.14 |
| 78 | Guthrie County | 17.99 |
| 79 | Monroe County | 17.47 |
| 80 | Calhoun County | 17.42 |
| 81 | Keokuk County | 17.32 |
| 82 | Franklin County | 17.22 |
| 83 | Sac County | 17.07 |
| 84 | Ida County | 16.23 |
| 85 | Palo Alto County | 15.95 |
| 86 | Osceola County | 15.53 |
| 87 | Greene County | 15.40 |
| 88 | Kossuth County | 15.24 |
| 89 | Van Buren County | 14.86 |
| 90 | Decatur County | 14.37 |
| 91 | Adair County | 13.17 |
| 92 | Fremont County | 12.92 |
| 93 | Audubon County | 12.81 |
| 94 | Monona County | 12.61 |
| 95 | Wayne County | 12.36 |
| 96 | Pocahontas County | 12.26 |
| 97 | Taylor County | 11.09 |
| 98 | Adams County | 8.75 |
| 99 | Ringgold County | 8.71 |