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Total Population in Illinois, by County

Total Population for every county in Illinois, ranked. The highest is Cook County at 5,182,090 and the lowest is Hardin County at 3,605.

Illinois: 12,694,798 · United States: 334,922,499 · median county in Illinois: 23,213

See Total Population on the interactive map →

#County Total Population
1Cook County5,182,090
2DuPage County930,024
3Lake County714,223
4Will County701,462
5Kane County517,255
6McHenry County312,591
7Winnebago County283,292
8Madison County264,238
9St. Clair County253,694
10Champaign County208,741
11Sangamon County194,947
12Peoria County179,645
13McLean County171,556
14Rock Island County142,757
15Kendall County137,675
16Tazewell County130,290
17LaSalle County108,714
18Kankakee County106,635
19Macon County101,849
20DeKalb County100,703
21Vermilion County72,386
22Williamson County66,876
23Adams County64,754
24Whiteside County54,947
25Boone County53,230
26Grundy County53,219
27Jackson County53,064
28Ogle County51,495
29Knox County49,046
30Henry County48,643
31Coles County46,777
32Macoupin County44,350
33Stephenson County43,768
34Woodford County38,312
35Franklin County37,323
36Marion County37,000
37Clinton County36,954
38Jefferson County36,550
39Livingston County35,565
40Monroe County35,036
41Effingham County34,522
42Lee County33,869
43Christian County33,538
44Morgan County33,021
45Fulton County33,020
46Bureau County32,866
47Randolph County30,058
48Montgomery County27,942
49Logan County27,713
50McDonough County26,920
51Iroquois County26,449
52Saline County23,213
53Jo Daviess County21,851
54Fayette County21,315
55Jersey County21,274
56Shelby County20,720
57Perry County20,639
58Douglas County19,751
59Crawford County18,511
60Hancock County17,281
61Union County16,997
62Bond County16,716
63Piatt County16,695
64Edgar County16,535
65Warren County16,447
66Wayne County15,973
67Richland County15,598
68Carroll County15,576
69Mercer County15,495
70De Witt County15,373
71Clark County15,266
72Lawrence County15,031
73Pike County14,469
74Moultrie County14,424
75Massac County13,865
76Washington County13,627
77White County13,619
78Ford County13,406
79Johnson County13,376
80Clay County13,052
81Cass County12,784
82Mason County12,745
83Menard County12,095
84Greene County11,683
85Marshall County11,647
86Wabash County11,119
87Cumberland County10,334
88Jasper County9,180
89Hamilton County7,916
90Schuyler County6,787
91Brown County6,322
92Henderson County6,193
93Edwards County6,075
94Putnam County5,601
95Stark County5,308
96Pulaski County5,015
97Scott County4,937
98Alexander County4,875
99Gallatin County4,819
100Calhoun County4,330
101Pope County3,739
102Hardin County3,605

Everyone living in the area, from the 5-year American Community Survey.

Source: ACS 2020-2024 5-Year Estimates, 2024.

Illinois ranks 6th of 52 states for total population.

Total Population in other states

Other statistics for Illinois by county