Illinois 2020 Census Population Density By County Map
The population density of Illinois from the 2020 Census was 230.8 people per square mile, based on data from the US Census Bureau.
Cook County had the highest population density (5,583.01 people per square mile), followed by DuPage County (2,845.88 people per square mile), and then Lake County (1,610.28 people per square mile). On the other hand, the 3 counties with the lowest population density were: Pope County (10.2 people per square mile), Gallatin County (15.32 people per square mile), and Schuyler County (15.78 people per square mile).
You can also see this information for other states and also for the US by state.
Hover over or click on the counties to see the population density for each county. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.
| County | Population Density |
|---|---|
| Adams | 76.87 |
| Alexander | 22.26 |
| Bond | 43.97 |
| Boone | 190.38 |
| Brown | 20.42 |
| Bureau | 38.25 |
| Calhoun | 17.48 |
| Carroll | 35.25 |
| Cass | 34.71 |
| Champaign | 206.67 |
| Christian | 47.97 |
| Clark | 30.83 |
| Clay | 28.37 |
| Clinton | 77.86 |
| Coles | 92.20 |
| Cook | 5583.01 |
| Crawford | 42.10 |
| Cumberland | 30.21 |
| DeKalb | 159.06 |
| De Witt | 39.03 |
| Douglas | 47.38 |
| DuPage | 2845.88 |
| Edgar | 27.06 |
| Edwards | 28.08 |
| Effingham | 72.41 |
| Fayette | 29.99 |
| Ford | 27.87 |
| Franklin | 92.45 |
| Fulton | 38.82 |
| Gallatin | 15.32 |
| Greene | 22.07 |
| Grundy | 125.64 |
| Hamilton | 18.39 |
| Hancock | 22.20 |
| Hardin | 20.57 |
| Henderson | 16.86 |
| Henry | 59.88 |
| Iroquois | 24.23 |
| Jackson | 90.78 |
| Jasper | 18.78 |
| Jefferson | 64.97 |
| Jersey | 58.19 |
| Jo Daviess | 36.67 |
| Johnson | 38.72 |
| Kane | 994.53 |
| Kankakee | 158.91 |
| Kendall | 411.78 |
| Knox | 69.75 |
| Lake | 1610.28 |
| LaSalle | 96.60 |
| Lawrence | 41.06 |
| Lee | 47.11 |
| Livingston | 34.32 |
| Logan | 45.28 |
| McDonough | 46.22 |
| McHenry | 514.14 |
| McLean | 144.48 |
| Macon | 179.13 |
| Macoupin | 52.11 |
| Madison | 371.57 |
| Marion | 65.90 |
| Marshall | 30.36 |
| Mason | 24.26 |
| Massac | 59.75 |
| Menard | 39.11 |
| Mercer | 27.97 |
| Monroe | 90.73 |
| Montgomery | 40.20 |
| Morgan | 57.85 |
| Moultrie | 43.24 |
| Ogle | 68.26 |
| Peoria | 293.88 |
| Perry | 47.40 |
| Piatt | 37.96 |
| Pike | 17.73 |
| Pope | 10.20 |
| Pulaski | 26.06 |
| Putnam | 35.21 |
| Randolph | 52.42 |
| Richland | 43.92 |
| Rock Island | 338.42 |
| St. Clair | 391.36 |
| Saline | 62.55 |
| Sangamon | 226.14 |
| Schuyler | 15.78 |
| Scott | 19.73 |
| Shelby | 27.67 |
| Stark | 18.74 |
| Stephenson | 79.10 |
| Tazewell | 203.17 |
| Union | 41.71 |
| Vermilion | 82.59 |
| Wabash | 50.87 |
| Warren | 31.04 |
| Washington | 24.46 |
| Wayne | 22.67 |
| White | 28.04 |
| Whiteside | 81.41 |
| Will | 833.08 |
| Williamson | 159.81 |
| Winnebago | 556.18 |
| Woodford | 72.92 |
