Illinois Counties by Population

Below are the 102 Illinois counties sorted by population from largest to smallest. The population data are from the 2022 Population Estimates Program and 2021 American Community Survey.

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Rank County Population
1 Cook County 5,109,292
2 DuPage County 920,901
3 Lake County 709,150
4 Will County 696,757
5 Kane County 514,182
6 McHenry County 311,747
7 Winnebago County 282,188
8 Madison County 263,864
9 St. Clair County 252,671
10 Champaign County 206,542
11 Sangamon County 194,534
12 Peoria County 178,383
13 McLean County 171,141
14 Rock Island County 141,527
15 Kendall County 137,254
16 Tazewell County 129,911
17 LaSalle County 108,078
18 Kankakee County 106,074
19 Macon County 101,483
20 DeKalb County 100,232
21 Vermilion County 72,337
22 Williamson County 66,695
23 Adams County 64,725
24 Whiteside County 54,658
25 Boone County 53,154
26 Grundy County 53,041
27 Jackson County 52,617
28 Ogle County 51,351
29 Knox County 48,640
30 Henry County 48,419
31 Coles County 46,334
32 Macoupin County 44,245
33 Stephenson County 43,627
34 Woodford County 38,128
35 Franklin County 37,242
36 Marion County 36,914
37 Clinton County 36,909
38 Jefferson County 36,400
39 Livingston County 35,521
40 Monroe County 35,033
41 Effingham County 34,325
42 Lee County 33,848
43 Christian County 33,436
44 Fulton County 33,021
45 Bureau County 32,828
46 Morgan County 32,209
47 Randolph County 30,068
48 Montgomery County 28,020
49 Logan County 27,591
50 McDonough County 26,861
51 Iroquois County 26,473
52 Saline County 23,087
53 Jo Daviess County 21,758
54 Fayette County 21,305
55 Jersey County 21,246
56 Shelby County 20,761
57 Perry County 20,588
58 Douglas County 19,755
59 Crawford County 18,536
60 Hancock County 17,244
61 Union County 16,767
62 Piatt County 16,723
63 Bond County 16,566
64 Edgar County 16,433
65 Warren County 16,354
66 Wayne County 15,872
67 Carroll County 15,529
68 Mercer County 15,504
69 Richland County 15,435
70 De Witt County 15,310
71 Clark County 15,229
72 Lawrence County 14,914
73 Pike County 14,484
74 Moultrie County 14,323
75 Massac County 13,896
76 Washington County 13,643
77 White County 13,614
78 Johnson County 13,381
79 Ford County 13,249
80 Clay County 13,047
81 Mason County 12,748
82 Cass County 12,657
83 Menard County 12,121
84 Marshall County 11,678
85 Greene County 11,651
86 Wabash County 11,087
87 Cumberland County 10,324
88 Jasper County 9,212
89 Hamilton County 7,984
90 Schuyler County 6,746
91 Brown County 6,330
92 Henderson County 6,151
93 Edwards County 6,071
94 Putnam County 5,572
95 Stark County 5,345
96 Pulaski County 4,991
97 Alexander County 4,858
98 Gallatin County 4,855
99 Scott County 4,790
100 Calhoun County 4,360
101 Pope County 3,770
102 Hardin County 3,597

United States Census Bureau. B01001 SEX BY AGE, 2021 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 8 December 2022. http://www.census.gov/.

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2022. U.S. Census Bureau, Population Division. Web. May 2023. http://www.census.gov/.

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