Illinois / Counties by Population

Illinois Counties by Population

Below are the 102 Illinois counties sorted by population from largest to smallest. The population data are from the 2021 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!

Rank County Population
1 Cook County 5,265,398
2 DuPage County 934,094
3 Lake County 714,484
4 Will County 696,403
5 Kane County 518,648
6 McHenry County 310,749
7 Winnebago County 285,471
8 Madison County 266,112
9 St. Clair County 258,597
10 Champaign County 206,583
11 Sangamon County 196,759
12 Peoria County 182,439
13 McLean County 171,455
14 Rock Island County 144,694
15 Tazewell County 131,977
16 Kendall County 130,757
17 LaSalle County 109,986
18 Kankakee County 108,104
19 Macon County 104,331
20 DeKalb County 100,922
21 Vermilion County 74,953
22 Williamson County 67,271
23 Adams County 65,878
24 Whiteside County 55,932
25 Jackson County 53,676
26 Boone County 53,592
27 Grundy County 52,364
28 Ogle County 51,787
29 Knox County 50,193
30 Henry County 49,412
31 Coles County 47,542
32 Macoupin County 45,152
33 Stephenson County 44,817
34 Woodford County 38,571
35 Franklin County 38,068
36 Marion County 37,781
37 Jefferson County 37,362
38 Clinton County 37,048
39 Livingston County 35,902
40 Monroe County 34,732
41 Effingham County 34,576
42 Lee County 34,373
43 Christian County 34,038
44 Fulton County 34,022
45 Bureau County 33,338
46 Morgan County 33,189
47 Randolph County 30,632
48 Montgomery County 28,482
49 Logan County 28,238
50 McDonough County 27,743
51 Iroquois County 27,362
52 Saline County 23,869
53 Jo Daviess County 21,995
54 Jersey County 21,533
55 Fayette County 21,514
56 Shelby County 21,160
57 Perry County 21,158
58 Douglas County 19,708
59 Crawford County 18,825
60 Hancock County 17,750
61 Union County 17,259
62 Edgar County 16,998
63 Warren County 16,887
64 Bond County 16,804
65 Piatt County 16,664
66 Wayne County 16,250
67 Richland County 15,876
68 Mercer County 15,779
69 De Witt County 15,653
70 Clark County 15,587
71 Carroll County 15,586
72 Lawrence County 15,465
73 Pike County 14,923
74 Moultrie County 14,634
75 Massac County 14,280
76 White County 13,959
77 Washington County 13,827
78 Ford County 13,589
79 Clay County 13,313
80 Johnson County 13,238
81 Mason County 13,225
82 Cass County 13,058
83 Menard County 12,343
84 Greene County 12,187
85 Marshall County 11,781
86 Wabash County 11,414
87 Cumberland County 10,528
88 Jasper County 9,324
89 Hamilton County 8,021
90 Schuyler County 6,953
91 Henderson County 6,485
92 Brown County 6,330
93 Edwards County 6,233
94 Putnam County 5,638
95 Alexander County 5,488
96 Stark County 5,436
97 Pulaski County 5,279
98 Gallatin County 5,038
99 Scott County 4,923
100 Calhoun County 4,537
101 Pope County 3,820
102 Hardin County 3,700

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/.

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