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 Census Redistricting dataset. If 2020 Census data are not available for a geography, then the population data are from the Census’ 2019 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 5,275,541
2 DuPage County 932,877
3 Lake County 714,342
4 Will County 696,355
5 Kane County 516,522
6 McHenry County 310,229
7 Winnebago County 285,350
8 Madison County 265,859
9 St. Clair County 257,400
10 Champaign County 205,865
11 Sangamon County 196,343
12 Peoria County 181,830
13 McLean County 170,954
14 Rock Island County 144,672
15 Kendall County 131,869
16 Tazewell County 131,343
17 LaSalle County 109,658
18 Kankakee County 107,502
19 Macon County 103,998
20 DeKalb County 100,420
21 Vermilion County 74,188
22 Williamson County 67,153
23 Adams County 65,737
24 Whiteside County 55,691
25 Boone County 53,448
26 Jackson County 52,974
27 Grundy County 52,533
28 Ogle County 51,788
29 Knox County 49,967
30 Henry County 49,284
31 Coles County 46,863
32 Macoupin County 44,967
33 Stephenson County 44,630
34 Woodford County 38,467
35 Franklin County 37,804
36 Marion County 37,729
37 Jefferson County 37,113
38 Clinton County 36,899
39 Livingston County 35,815
40 Monroe County 34,962
41 Effingham County 34,668
42 Lee County 34,145
43 Christian County 34,032
44 Fulton County 33,609
45 Bureau County 33,244
46 Morgan County 32,915
47 Randolph County 30,163
48 Montgomery County 28,288
49 Logan County 27,987
50 McDonough County 27,238
51 Iroquois County 27,077
52 Saline County 23,768
53 Jo Daviess County 22,035
54 Jersey County 21,512
55 Fayette County 21,488
56 Shelby County 20,990
57 Perry County 20,945
58 Douglas County 19,740
59 Crawford County 18,679
60 Hancock County 17,620
61 Union County 17,244
62 Edgar County 16,866
63 Warren County 16,835
64 Bond County 16,725
65 Piatt County 16,673
66 Wayne County 16,179
67 Richland County 15,813
68 Carroll County 15,702
69 Mercer County 15,699
70 De Witt County 15,516
71 Clark County 15,455
72 Lawrence County 15,280
73 Pike County 14,739
74 Moultrie County 14,526
75 Massac County 14,169
76 White County 13,877
77 Washington County 13,761
78 Ford County 13,534
79 Johnson County 13,308
80 Clay County 13,288
81 Mason County 13,086
82 Cass County 13,042
83 Menard County 12,297
84 Greene County 11,985
85 Marshall County 11,742
86 Wabash County 11,361
87 Cumberland County 10,450
88 Jasper County 9,287
89 Hamilton County 7,993
90 Schuyler County 6,902
91 Henderson County 6,387
92 Edwards County 6,245
93 Brown County 6,244
94 Putnam County 5,637
95 Stark County 5,400
96 Alexander County 5,240
97 Pulaski County 5,193
98 Scott County 4,949
99 Gallatin County 4,946
100 Calhoun County 4,437
101 Pope County 3,763
102 Hardin County 3,649

United States Census Bureau. B01001 SEX BY AGE, 2019 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 10 December 2020. http://www.census.gov/.

United States Census Bureau. "P2 Hispanic or Latino, and Not Hispanic or Latino by Race." 2020 Census State Redistricting Data (Public Law 94-171) Summary File. U.S. Census Bureau, 2020 Census. Web. 12 August 2021. https://www.census.gov/.

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