US Census Data

Largest by population in Illinois

Illinois counties and cities ranked by population.

This page ranks the counties and cities of Illinois by population — which have the most people, according to the US Census Bureau's American Community Survey 5-year estimates.

Among counties, Cook County leads at 5,185,812.

Among cities & places, Chicago leads at 2,707,648.

Counties

Top 100.
#NamePopulation
1Cook County5,185,812
2DuPage County927,263
3Lake County711,885
4Will County698,450
5Kane County516,097
6McHenry County311,366
7Winnebago County283,289
8Madison County264,631
9St. Clair County254,777
10Champaign County206,098
11Sangamon County195,217
12Peoria County179,831
13McLean County170,882
14Rock Island County142,995
15Kendall County135,053
16Tazewell County130,555
17LaSalle County109,049
18Kankakee County106,833
19Macon County102,591
20DeKalb County100,512
21Vermilion County73,179
22Williamson County66,902
23Adams County65,166
24Whiteside County55,192
25Boone County53,316
26Grundy County52,920
27Jackson County52,706
28Ogle County51,536
29Knox County49,294
30Henry County48,948
31Coles County46,689
32Macoupin County44,566
33Stephenson County44,042
34Woodford County38,348
35Franklin County37,541
36Marion County37,294
37Clinton County36,899
38Jefferson County36,808
39Livingston County35,659
40Monroe County34,969
41Effingham County34,505
42Lee County34,058
43Christian County33,684
44Fulton County33,259
45Bureau County33,027
46Morgan County32,621
47Randolph County30,142
48Montgomery County28,078
49Logan County27,870
50McDonough County27,102
51Iroquois County26,746
52Saline County23,387
53Jo Daviess County21,918
54Fayette County21,380
55Jersey County21,336
56Shelby County20,867
57Perry County20,810
58Douglas County19,686
59Crawford County18,588
60Hancock County17,434
61Union County16,972
62Piatt County16,702
63Edgar County16,637
64Bond County16,627
65Warren County16,576
66Wayne County15,994
67Richland County15,675
68Carroll County15,621
69Mercer County15,619
70De Witt County15,461
71Clark County15,328
72Lawrence County15,137
73Pike County14,625
74Moultrie County14,469
75Massac County13,958
76White County13,708
77Washington County13,682
78Ford County13,396
79Johnson County13,350
80Clay County13,173
81Mason County12,878
82Cass County12,826
83Menard County12,169
84Greene County11,837
85Marshall County11,715
86Wabash County11,199
87Cumberland County10,378
88Jasper County9,233
89Hamilton County7,972
90Schuyler County6,826
91Brown County6,320
92Henderson County6,284
93Edwards County6,118
94Putnam County5,600
95Stark County5,324
96Pulaski County5,074
97Alexander County5,042
98Gallatin County4,857
99Scott County4,847
100Calhoun County4,406

Cities & places

Top 100.
#NamePopulation
1Chicago2,707,648
2Aurora179,867
3Joliet149,785
4Naperville149,424
5Rockford147,649
6Elgin114,106
7Springfield113,714
8Peoria112,126
9Waukegan88,919
10Champaign88,822
11Cicero83,223
12Bloomington78,703
13Schaumburg76,780
14Evanston76,552
15Arlington Heights76,220
16Bolingbrook73,813
17Decatur70,368
18Palatine66,548
19Skokie66,427
20Des Plaines59,408
21Orland Park57,961
22Oak Lawn57,098
23Berwyn55,888
24Mount Prospect55,648
25Tinley Park55,007
26Wheaton53,453
27Oak Park53,315
28Normal52,908
29Hoffman Estates51,186
30Downers Grove49,867
31Glenview47,682
32Plainfield45,705
33Elmhurst45,538
34Lombard43,722
35Buffalo Grove42,824
36Moline42,235
37Belleville41,722
38Romeoville40,996
39Bartlett40,531
40DeKalb40,464
41Crystal Lake40,436
42Carol Stream39,427
43Park Ridge39,241
44Quincy39,188
45Streamwood39,055
46Wheeling38,495
47Urbana38,447
48Carpentersville37,544
49Hanover Park36,850
50Rock Island36,758
51Addison35,470
52Oswego35,463
53Calumet City35,253
54Northbrook34,642
55Woodridge33,889
56Glendale Heights32,864
57St. Charles32,733
58O'Fallon32,139
59Elk Grove Village32,132
60Pekin31,812
61Mundelein31,632
62North Chicago30,772
63Gurnee30,486
64Niles30,262
65Highland Park30,229
66Algonquin29,904
67Galesburg29,653
68Lake in the Hills28,853
69Burbank28,822
70Danville28,663
71Lansing28,415
72Glen Ellyn28,270
73Huntley27,859
74McHenry27,774
75Wilmette27,550
76New Lenox27,456
77Round Lake Beach27,081
78Chicago Heights26,938
79Oak Forest26,888
80Vernon Hills26,772
81Batavia26,730
82Granite City26,670
83Edwardsville26,543
84Woodstock26,316
85Lockport26,228
86West Chicago25,434
87Alton25,430
88Morton Grove24,687
89Homer Glen24,516
90Melrose Park24,513
91Belvidere24,510
92Zion24,466
93Kankakee24,384
94Westmont24,201
95Collinsville24,126
96South Elgin23,984
97Elmwood Park23,982
98Rolling Meadows23,981
99Freeport23,636
100Blue Island23,416

Nationwide

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Other rankings in Illinois

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