Illinois / Counties by Population

Illinois Counties by Population

Below are the 102 Illinois counties sorted by population from 1 to 102 . The population data are from the 2020 American Community Survey. You can copy and paste this list directly into your favorite spreadsheet program. Don't you just adore lovely numbers listed nicely in columns & rows? We do!

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Rank County Population
1 Cook County 5,169,517
2 DuPage County 926,005
3 Lake County 699,682
4 Will County 689,704
5 Kane County 531,756
6 McHenry County 307,291
7 Winnebago County 283,635
8 Madison County 264,403
9 St. Clair County 261,186
10 Champaign County 210,006
11 Sangamon County 195,963
12 Peoria County 181,111
13 McLean County 172,164
14 Rock Island County 142,801
15 Tazewell County 132,524
16 Kendall County 127,583
17 Kankakee County 109,924
18 LaSalle County 108,998
19 Macon County 104,688
20 DeKalb County 104,588
21 Vermilion County 76,704
22 Williamson County 66,929
23 Adams County 65,670
24 Jackson County 57,517
25 Whiteside County 55,583
26 Boone County 53,293
27 Coles County 51,065
28 Grundy County 50,798
29 Ogle County 50,793
30 Knox County 50,052
31 Henry County 49,032
32 Macoupin County 45,243
33 Stephenson County 44,683
34 Franklin County 38,688
35 Woodford County 38,503
36 Jefferson County 37,774
37 Clinton County 37,549
38 Marion County 37,524
39 Livingston County 35,757
40 Fulton County 34,654
41 Monroe County 34,444
42 Lee County 34,204
43 Effingham County 34,151
44 Morgan County 34,012
45 Bureau County 32,878
46 Christian County 32,705
47 Randolph County 31,973
48 McDonough County 30,107
49 Logan County 28,818
50 Montgomery County 28,598
51 Iroquois County 27,437
52 Saline County 23,735
53 Jersey County 21,776
54 Shelby County 21,623
55 Jo Daviess County 21,429
56 Fayette County 21,418
57 Perry County 21,092
58 Douglas County 19,551
59 Crawford County 18,833
60 Hancock County 17,820
61 Edgar County 17,272
62 Warren County 16,981
63 Union County 16,829
64 Bond County 16,520
65 Piatt County 16,412
66 Wayne County 16,309
67 Lawrence County 15,830
68 De Witt County 15,764
69 Richland County 15,677
70 Clark County 15,602
71 Pike County 15,571
72 Mercer County 15,503
73 Moultrie County 14,557
74 Carroll County 14,398
75 Massac County 14,041
76 Washington County 13,967
77 White County 13,712
78 Mason County 13,486
79 Clay County 13,217
80 Ford County 13,155
81 Greene County 12,988
82 Johnson County 12,391
83 Cass County 12,324
84 Menard County 12,261
85 Marshall County 11,562
86 Wabash County 11,390
87 Cumberland County 10,787
88 Jasper County 9,547
89 Hamilton County 8,151
90 Schuyler County 6,897
91 Henderson County 6,737
92 Brown County 6,599
93 Edwards County 6,431
94 Alexander County 6,011
95 Putnam County 5,720
96 Pulaski County 5,414
97 Stark County 5,393
98 Gallatin County 4,983
99 Scott County 4,982
100 Calhoun County 4,782
101 Pope County 4,177
102 Hardin County 3,890

United States Census Bureau. B01001 SEX BY AGE, 2020 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 17 March 2022. http://www.census.gov/.

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