Ranking of Illinois Counties By Population in 2012

Updated on July 26, 2024.

Based on the US Census Vintage data estimates, in 2012, the Population for Illinois was 12.88M. Among all Illinois counties, Cook County had the highest population (5.24M), followed by DuPage County (928.72K), and Lake County (702.12K).

The chart below shows the top 10 counties, and the table below shows the ranking of all Illinois counties.

You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.

See this for other years:
Ranking of Illinois Counties By Population in 2012
Cook
DuPage
Lake
Will
Kane
McHenry
Winnebago
St. Clair
Madison
Champaign
Ranking of Illinois Counties By Population in 2012
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Rank County Population
1 Cook County 5239105
2 DuPage County 928719
3 Lake County 702117
4 Will County 682459
5 Kane County 520615
6 McHenry County 308248
7 Winnebago County 292128
8 St. Clair County 268748
9 Madison County 268124
10 Champaign County 204697
11 Sangamon County 199431
12 Peoria County 187354
13 McLean County 172762
14 Rock Island County 147699
15 Tazewell County 136149
16 Kendall County 118255
17 Kankakee County 112995
18 LaSalle County 112913
19 Macon County 110162
20 DeKalb County 104385
21 Vermilion County 80881
22 Adams County 67149
23 Williamson County 66793
24 Jackson County 59081
25 Whiteside County 57772
26 Boone County 53729
27 Coles County 53333
28 Ogle County 52788
29 Knox County 52302
30 Henry County 50263
31 Grundy County 50161
32 Macoupin County 47058
33 Stephenson County 46895
34 Franklin County 39872
35 Marion County 39018
36 Woodford County 38846
37 Jefferson County 38672
38 Livingston County 38519
39 Clinton County 37908
40 Fulton County 36585
41 Morgan County 35318
42 Lee County 35218
43 Christian County 34522
44 Bureau County 34350
45 Effingham County 34270
46 Monroe County 33320
47 Randolph County 33023
48 McDonough County 32567
49 Logan County 30359
50 Montgomery County 29620
51 Iroquois County 29270
52 Saline County 24913
53 Jersey County 22717
54 Jo Daviess County 22542
55 Shelby County 22204
56 Fayette County 22167
57 Perry County 21849
58 Douglas County 19881
59 Crawford County 19594
60 Hancock County 18830
61 Edgar County 18170
62 Warren County 17742
63 Union County 17609
64 Bond County 17538
65 Lawrence County 16732
66 Wayne County 16668
67 Piatt County 16505
68 De Witt County 16490
69 Clark County 16265
70 Pike County 16233
71 Mercer County 16165
72 Richland County 16132
73 Carroll County 15121
74 Massac County 15067
75 Moultrie County 14876
76 Washington County 14598
77 White County 14524
78 Mason County 14322
79 Ford County 13877
80 Clay County 13710
81 Greene County 13657
82 Cass County 13427
83 Johnson County 12851
84 Menard County 12692
85 Marshall County 12261
86 Wabash County 11690
87 Cumberland County 10955
88 Jasper County 9674
89 Hamilton County 8387
90 Alexander County 7721
91 Schuyler County 7456
92 Henderson County 7048
93 Brown County 6893
94 Edwards County 6725
95 Pulaski County 5965
96 Putnam County 5911
97 Stark County 5742
98 Gallatin County 5391
99 Scott County 5290
100 Calhoun County 4983
101 Pope County 4464
102 Hardin County 4278