Illinois Counties by Population

Below are the 102 Illinois counties sorted by population from largest to smallest. The population data are from the 2022 American Community Survey.

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Rank County Population
1 Cook County 5,225,367
2 DuPage County 930,559
3 Lake County 713,159
4 Will County 696,774
5 Kane County 517,254
6 McHenry County 311,133
7 Winnebago County 284,591
8 Madison County 265,512
9 St. Clair County 256,791
10 Champaign County 206,525
11 Sangamon County 196,122
12 Peoria County 181,186
13 McLean County 171,284
14 Rock Island County 143,819
15 Kendall County 132,795
16 Tazewell County 131,276
17 LaSalle County 109,495
18 Kankakee County 107,421
19 Macon County 103,542
20 DeKalb County 100,686
21 Vermilion County 74,113
22 Williamson County 67,120
23 Adams County 65,583
24 Whiteside County 55,569
25 Boone County 53,459
26 Jackson County 53,176
27 Grundy County 52,624
28 Ogle County 51,672
29 Knox County 49,751
30 Henry County 49,157
31 Coles County 47,076
32 Macoupin County 44,907
33 Stephenson County 44,482
34 Woodford County 38,414
35 Franklin County 37,810
36 Marion County 37,543
37 Jefferson County 37,043
38 Clinton County 36,998
39 Livingston County 35,771
40 Monroe County 34,905
41 Effingham County 34,594
42 Lee County 34,221
43 Christian County 33,893
44 Fulton County 33,691
45 Bureau County 33,203
46 Morgan County 32,882
47 Randolph County 30,413
48 Montgomery County 28,352
49 Logan County 28,027
50 McDonough County 27,370
51 Iroquois County 27,043
52 Saline County 23,662
53 Jo Daviess County 21,942
54 Fayette County 21,464
55 Jersey County 21,462
56 Shelby County 21,042
57 Perry County 20,996
58 Douglas County 19,714
59 Crawford County 18,729
60 Hancock County 17,582
61 Union County 17,122
62 Edgar County 16,852
63 Warren County 16,760
64 Bond County 16,750
65 Piatt County 16,698
66 Wayne County 16,127
67 Richland County 15,716
68 Mercer County 15,692
69 Carroll County 15,594
70 De Witt County 15,535
71 Clark County 15,467
72 Lawrence County 15,302
73 Pike County 14,776
74 Moultrie County 14,531
75 Massac County 14,135
76 White County 13,834
77 Washington County 13,781
78 Ford County 13,484
79 Johnson County 13,313
80 Clay County 13,248
81 Mason County 13,074
82 Cass County 12,955
83 Menard County 12,284
84 Greene County 12,015
85 Marshall County 11,740
86 Wabash County 11,321
87 Cumberland County 10,447
88 Jasper County 9,295
89 Hamilton County 8,008
90 Schuyler County 6,879
91 Henderson County 6,374
92 Brown County 6,334
93 Edwards County 6,182
94 Putnam County 5,628
95 Stark County 5,395
96 Alexander County 5,261
97 Pulaski County 5,177
98 Gallatin County 4,967
99 Scott County 4,899
100 Calhoun County 4,472
101 Pope County 3,799
102 Hardin County 3,665

United States Census Bureau. B01001 SEX BY AGE, 2022 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 7 December 2023. http://www.census.gov/.

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