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 2021 Population Estimates Program and 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 5,173,146
2 DuPage County 924,885
3 Lake County 711,239
4 Will County 697,252
5 Kane County 515,588
6 McHenry County 311,122
7 Winnebago County 283,119
8 Madison County 264,490
9 St. Clair County 254,796
10 Champaign County 205,943
11 Sangamon County 194,734
12 Peoria County 179,432
13 McLean County 170,889
14 Rock Island County 142,909
15 Kendall County 134,867
16 Tazewell County 130,413
17 LaSalle County 108,965
18 Kankakee County 106,601
19 Macon County 102,432
20 DeKalb County 100,414
21 Vermilion County 73,095
22 Williamson County 66,879
23 Adams County 64,954
24 Whiteside County 55,305
25 Boone County 53,159
26 Grundy County 52,989
27 Jackson County 52,565
28 Ogle County 51,449
29 Knox County 49,268
30 Henry County 48,907
31 Coles County 46,765
32 Macoupin County 44,406
33 Stephenson County 44,021
34 Woodford County 38,225
35 Franklin County 37,442
36 Marion County 37,390
37 Jefferson County 36,877
38 Clinton County 36,793
39 Livingston County 35,664
40 Monroe County 34,932
41 Effingham County 34,430
42 Lee County 34,049
43 Christian County 33,662
44 Fulton County 33,197
45 Bureau County 32,883
46 Morgan County 32,606
47 Randolph County 30,142
48 Montgomery County 28,084
49 Logan County 27,992
50 McDonough County 26,828
51 Iroquois County 26,827
52 Saline County 23,320
53 Jo Daviess County 21,939
54 Fayette County 21,384
55 Jersey County 21,333
56 Perry County 20,985
57 Shelby County 20,789
58 Douglas County 19,722
59 Crawford County 18,659
60 Hancock County 17,400
61 Union County 16,923
62 Piatt County 16,753
63 Bond County 16,596
64 Warren County 16,531
65 Edgar County 16,520
66 Wayne County 15,963
67 Richland County 15,796
68 Carroll County 15,698
69 Mercer County 15,582
70 De Witt County 15,341
71 Clark County 15,300
72 Lawrence County 15,152
73 Pike County 14,618
74 Moultrie County 14,510
75 Massac County 13,960
76 White County 13,784
77 Washington County 13,655
78 Ford County 13,511
79 Johnson County 13,463
80 Clay County 13,143
81 Mason County 12,881
82 Cass County 12,773
83 Menard County 12,164
84 Greene County 11,843
85 Marshall County 11,663
86 Wabash County 11,202
87 Cumberland County 10,345
88 Jasper County 9,193
89 Hamilton County 7,911
90 Schuyler County 6,843
91 Brown County 6,421
92 Henderson County 6,312
93 Edwards County 6,075
94 Putnam County 5,566
95 Stark County 5,294
96 Pulaski County 5,065
97 Alexander County 5,030
98 Gallatin County 4,903
99 Scott County 4,836
100 Calhoun County 4,369
101 Pope County 3,779
102 Hardin County 3,650

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/.

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2021. U.S. Census Bureau, Population Division. Web. May 2022. http://www.census.gov/.

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