Below are the 102 Illinois counties sorted by population from largest to smallest. The population data are from the 2022 American Community Survey.
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Rank | County | Population |
---|---|---|
1 | Cook County | 5,225,367 |
2 | DuPage County | 930,559 |
3 | Lake County | 713,159 |
4 | Will County | 696,774 |
5 | Kane County | 517,254 |
6 | McHenry County | 311,133 |
7 | Winnebago County | 284,591 |
8 | Madison County | 265,512 |
9 | St. Clair County | 256,791 |
10 | Champaign County | 206,525 |
11 | Sangamon County | 196,122 |
12 | Peoria County | 181,186 |
13 | McLean County | 171,284 |
14 | Rock Island County | 143,819 |
15 | Kendall County | 132,795 |
16 | Tazewell County | 131,276 |
17 | LaSalle County | 109,495 |
18 | Kankakee County | 107,421 |
19 | Macon County | 103,542 |
20 | DeKalb County | 100,686 |
21 | Vermilion County | 74,113 |
22 | Williamson County | 67,120 |
23 | Adams County | 65,583 |
24 | Whiteside County | 55,569 |
25 | Boone County | 53,459 |
26 | Jackson County | 53,176 |
27 | Grundy County | 52,624 |
28 | Ogle County | 51,672 |
29 | Knox County | 49,751 |
30 | Henry County | 49,157 |
31 | Coles County | 47,076 |
32 | Macoupin County | 44,907 |
33 | Stephenson County | 44,482 |
34 | Woodford County | 38,414 |
35 | Franklin County | 37,810 |
36 | Marion County | 37,543 |
37 | Jefferson County | 37,043 |
38 | Clinton County | 36,998 |
39 | Livingston County | 35,771 |
40 | Monroe County | 34,905 |
41 | Effingham County | 34,594 |
42 | Lee County | 34,221 |
43 | Christian County | 33,893 |
44 | Fulton County | 33,691 |
45 | Bureau County | 33,203 |
46 | Morgan County | 32,882 |
47 | Randolph County | 30,413 |
48 | Montgomery County | 28,352 |
49 | Logan County | 28,027 |
50 | McDonough County | 27,370 |
51 | Iroquois County | 27,043 |
52 | Saline County | 23,662 |
53 | Jo Daviess County | 21,942 |
54 | Fayette County | 21,464 |
55 | Jersey County | 21,462 |
56 | Shelby County | 21,042 |
57 | Perry County | 20,996 |
58 | Douglas County | 19,714 |
59 | Crawford County | 18,729 |
60 | Hancock County | 17,582 |
61 | Union County | 17,122 |
62 | Edgar County | 16,852 |
63 | Warren County | 16,760 |
64 | Bond County | 16,750 |
65 | Piatt County | 16,698 |
66 | Wayne County | 16,127 |
67 | Richland County | 15,716 |
68 | Mercer County | 15,692 |
69 | Carroll County | 15,594 |
70 | De Witt County | 15,535 |
71 | Clark County | 15,467 |
72 | Lawrence County | 15,302 |
73 | Pike County | 14,776 |
74 | Moultrie County | 14,531 |
75 | Massac County | 14,135 |
76 | White County | 13,834 |
77 | Washington County | 13,781 |
78 | Ford County | 13,484 |
79 | Johnson County | 13,313 |
80 | Clay County | 13,248 |
81 | Mason County | 13,074 |
82 | Cass County | 12,955 |
83 | Menard County | 12,284 |
84 | Greene County | 12,015 |
85 | Marshall County | 11,740 |
86 | Wabash County | 11,321 |
87 | Cumberland County | 10,447 |
88 | Jasper County | 9,295 |
89 | Hamilton County | 8,008 |
90 | Schuyler County | 6,879 |
91 | Henderson County | 6,374 |
92 | Brown County | 6,334 |
93 | Edwards County | 6,182 |
94 | Putnam County | 5,628 |
95 | Stark County | 5,395 |
96 | Alexander County | 5,261 |
97 | Pulaski County | 5,177 |
98 | Gallatin County | 4,967 |
99 | Scott County | 4,899 |
100 | Calhoun County | 4,472 |
101 | Pope County | 3,799 |
102 | Hardin County | 3,665 |
United States Census Bureau. B01001 SEX BY AGE, 2022 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 7 December 2023. http://www.census.gov/. |
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