Ranking of Illinois Counties By Population Density from Census 2020
According to the data from the US 2020 Census, as at April 2020, among all Illinois counties, Cook County had the highest population density per square mile (5.58K people per sqr mile), followed by DuPage County (2.85K people per sqr mile), and Lake County (1.61K people per sqr mile).
On the other hand, Pope County had the lowest population density (10.20 people per sqr mile), followed by Gallatin County (15.32 people per sqr mile), and Schuyler County (15.78 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 Illinois counties.
You can also see similar ranking of counties information for other states as well as for all counties in the United States.
| Rank | County | Population Density |
|---|---|---|
| 1 | Cook County | 5583.01 |
| 2 | DuPage County | 2845.88 |
| 3 | Lake County | 1610.28 |
| 4 | Kane County | 994.53 |
| 5 | Will County | 833.08 |
| 6 | Winnebago County | 556.18 |
| 7 | McHenry County | 514.14 |
| 8 | Kendall County | 411.78 |
| 9 | St. Clair County | 391.36 |
| 10 | Madison County | 371.57 |
| 11 | Rock Island County | 338.42 |
| 12 | Peoria County | 293.88 |
| 13 | Sangamon County | 226.14 |
| 14 | Champaign County | 206.67 |
| 15 | Tazewell County | 203.17 |
| 16 | Boone County | 190.38 |
| 17 | Macon County | 179.13 |
| 18 | Williamson County | 159.81 |
| 19 | DeKalb County | 159.06 |
| 20 | Kankakee County | 158.91 |
| 21 | McLean County | 144.48 |
| 22 | Grundy County | 125.64 |
| 23 | LaSalle County | 96.60 |
| 24 | Franklin County | 92.45 |
| 25 | Coles County | 92.20 |
| 26 | Jackson County | 90.78 |
| 27 | Monroe County | 90.73 |
| 28 | Vermilion County | 82.59 |
| 29 | Whiteside County | 81.41 |
| 30 | Stephenson County | 79.10 |
| 31 | Clinton County | 77.86 |
| 32 | Adams County | 76.87 |
| 33 | Woodford County | 72.92 |
| 34 | Effingham County | 72.41 |
| 35 | Knox County | 69.75 |
| 36 | Ogle County | 68.26 |
| 37 | Marion County | 65.90 |
| 38 | Jefferson County | 64.97 |
| 39 | Saline County | 62.55 |
| 40 | Henry County | 59.88 |
| 41 | Massac County | 59.75 |
| 42 | Jersey County | 58.19 |
| 43 | Morgan County | 57.85 |
| 44 | Randolph County | 52.42 |
| 45 | Macoupin County | 52.11 |
| 46 | Wabash County | 50.87 |
| 47 | Christian County | 47.97 |
| 48 | Perry County | 47.40 |
| 49 | Douglas County | 47.38 |
| 50 | Lee County | 47.11 |
| 51 | McDonough County | 46.22 |
| 52 | Logan County | 45.28 |
| 53 | Bond County | 43.97 |
| 54 | Richland County | 43.92 |
| 55 | Moultrie County | 43.24 |
| 56 | Crawford County | 42.10 |
| 57 | Union County | 41.71 |
| 58 | Lawrence County | 41.06 |
| 59 | Montgomery County | 40.20 |
| 60 | Menard County | 39.11 |
| 61 | De Witt County | 39.03 |
| 62 | Fulton County | 38.82 |
| 63 | Johnson County | 38.72 |
| 64 | Bureau County | 38.25 |
| 65 | Piatt County | 37.96 |
| 66 | Jo Daviess County | 36.67 |
| 67 | Carroll County | 35.25 |
| 68 | Putnam County | 35.21 |
| 69 | Cass County | 34.71 |
| 70 | Livingston County | 34.32 |
| 71 | Warren County | 31.04 |
| 72 | Clark County | 30.83 |
| 73 | Marshall County | 30.36 |
| 74 | Cumberland County | 30.21 |
| 75 | Fayette County | 29.99 |
| 76 | Clay County | 28.37 |
| 77 | Edwards County | 28.08 |
| 78 | White County | 28.04 |
| 79 | Mercer County | 27.97 |
| 80 | Ford County | 27.87 |
| 81 | Shelby County | 27.67 |
| 82 | Edgar County | 27.06 |
| 83 | Pulaski County | 26.06 |
| 84 | Washington County | 24.46 |
| 85 | Mason County | 24.26 |
| 86 | Iroquois County | 24.23 |
| 87 | Wayne County | 22.67 |
| 88 | Alexander County | 22.26 |
| 89 | Hancock County | 22.20 |
| 90 | Greene County | 22.07 |
| 91 | Hardin County | 20.57 |
| 92 | Brown County | 20.42 |
| 93 | Scott County | 19.73 |
| 94 | Jasper County | 18.78 |
| 95 | Stark County | 18.74 |
| 96 | Hamilton County | 18.39 |
| 97 | Pike County | 17.73 |
| 98 | Calhoun County | 17.48 |
| 99 | Henderson County | 16.86 |
| 100 | Schuyler County | 15.78 |
| 101 | Gallatin County | 15.32 |
| 102 | Pope County | 10.20 |