Rank |
County |
Population Density |
1 |
Cook County, Illinois
|
5,495.1
|
2 |
DuPage County, Illinois
|
2,799.8
|
3 |
Lake County, Illinois
|
1,585.6
|
4 |
Kane County, Illinois
|
990.8
|
5 |
Will County, Illinois
|
809.6
|
6 |
Winnebago County, Illinois
|
575.2
|
7 |
McHenry County, Illinois
|
511.9
|
8 |
St Clair County, Illinois
|
410.6
|
9 |
Madison County, Illinois
|
376.3
|
10 |
Kendall County, Illinois
|
358.2
|
11 |
Rock Island County, Illinois
|
345
|
12 |
Peoria County, Illinois
|
301.2
|
13 |
Sangamon County, Illinois
|
227.4
|
14 |
Tazewell County, Illinois
|
208.6
|
15 |
Champaign County, Illinois
|
201.8
|
16 |
Boone County, Illinois
|
193
|
17 |
Macon County, Illinois
|
190.8
|
18 |
Kankakee County, Illinois
|
167.7
|
19 |
DeKalb County, Illinois
|
166.6
|
20 |
Williamson County, Illinois
|
157.9
|
21 |
McLean County, Illinois
|
143.3
|
22 |
Grundy County, Illinois
|
119.8
|
23 |
Coles County, Illinois
|
106
|
24 |
Jackson County, Illinois
|
103.1
|
25 |
LaSalle County, Illinois
|
100.4
|
26 |
Franklin County, Illinois
|
96.8
|
27 |
Vermilion County, Illinois
|
90.9
|
28 |
Monroe County, Illinois
|
85.6
|
29 |
Whiteside County, Illinois
|
85.5
|
30 |
Stephenson County, Illinois
|
84.5
|
31 |
Clinton County, Illinois
|
79.7
|
32 |
Adams County, Illinois
|
78.5
|
33 |
Knox County, Illinois
|
73.9
|
34 |
Woodford County, Illinois
|
73.3
|
35 |
Effingham County, Illinois
|
71.5
|
36 |
Ogle County, Illinois
|
70.5
|
37 |
Marion County, Illinois
|
68.9
|
38 |
Jefferson County, Illinois
|
68
|
39 |
Saline County, Illinois
|
65.6
|
40 |
Massac County, Illinois
|
65
|
41 |
Morgan County, Illinois
|
62.5
|
42 |
Jersey County, Illinois
|
62.2
|
43 |
Henry County, Illinois
|
61.3
|
44 |
Randolph County, Illinois
|
58.2
|
45 |
Macoupin County, Illinois
|
55.4
|
46 |
McDonough County, Illinois
|
55.3
|
47 |
Wabash County, Illinois
|
53.5
|
48 |
Perry County, Illinois
|
50.6
|
49 |
Lee County, Illinois
|
49.7
|
50 |
Christian County, Illinois
|
49.1
|
51 |
Logan County, Illinois
|
49
|
52 |
Douglas County, Illinois
|
48
|
53 |
Bond County, Illinois
|
46.7
|
54 |
Lawrence County, Illinois
|
45.2
|
55 |
Richland County, Illinois
|
45.1
|
56 |
Crawford County, Illinois
|
44.7
|
57 |
Moultrie County, Illinois
|
44.2
|
58 |
Union County, Illinois
|
43.1
|
59 |
Montgomery County, Illinois
|
42.8
|
60 |
Fulton County, Illinois
|
42.8
|
61 |
De Witt County, Illinois
|
41.7
|
62 |
Menard County, Illinois
|
40.4
|
63 |
Bureau County, Illinois
|
40.2
|
64 |
Piatt County, Illinois
|
38.1
|
65 |
Jo Daviess County, Illinois
|
37.7
|
66 |
Putnam County, Illinois
|
37.5
|
67 |
Livingston County, Illinois
|
37.3
|
68 |
Johnson County, Illinois
|
36.6
|
69 |
Cass County, Illinois
|
36.3
|
70 |
Alexander County, Illinois
|
35
|
71 |
Carroll County, Illinois
|
34.6
|
72 |
Marshall County, Illinois
|
32.7
|
73 |
Clark County, Illinois
|
32.6
|
74 |
Warren County, Illinois
|
32.6
|
75 |
Cumberland County, Illinois
|
31.9
|
76 |
Pulaski County, Illinois
|
30.9
|
77 |
Fayette County, Illinois
|
30.9
|
78 |
Edwards County, Illinois
|
30.2
|
79 |
Edgar County, Illinois
|
29.8
|
80 |
White County, Illinois
|
29.6
|
81 |
Shelby County, Illinois
|
29.5
|
82 |
Clay County, Illinois
|
29.5
|
83 |
Mercer County, Illinois
|
29.3
|
84 |
Ford County, Illinois
|
29
|
85 |
Mason County, Illinois
|
27.2
|
86 |
Iroquois County, Illinois
|
26.6
|
87 |
Washington County, Illinois
|
26.2
|
88 |
Greene County, Illinois
|
25.6
|
89 |
Hardin County, Illinois
|
24.3
|
90 |
Hancock County, Illinois
|
24.1
|
91 |
Wayne County, Illinois
|
23.5
|
92 |
Brown County, Illinois
|
22.7
|
93 |
Scott County, Illinois
|
21.3
|
94 |
Stark County, Illinois
|
20.8
|
95 |
Calhoun County, Illinois
|
20
|
96 |
Pike County, Illinois
|
19.8
|
97 |
Jasper County, Illinois
|
19.6
|
98 |
Hamilton County, Illinois
|
19.5
|
99 |
Henderson County, Illinois
|
19.3
|
100 |
Gallatin County, Illinois
|
17.3
|
101 |
Schuyler County, Illinois
|
17.3
|
102 |
Pope County, Illinois
|
12.1
|