| Combined statistical area[1]
|
2023 population (est.)[2]
|
Core-based statistical area[1]
|
2023 population (est.)[2]
|
County
|
2023 population (est.)[2]
|
Metropolitan division[1]
|
2023 population (est.)[2]
|
| Chicago-Naperville, IL-IN-WI CSA
|
9,794,558
8,791,936 (IL)
|
Chicago-Naperville-Elgin, IL-IN MSA
|
9,262,825
8,539,397 (IL)
|
Cook County, Illinois
|
5,087,072
|
Chicago-Naperville-Schaumburg, IL MD
|
7,075,391
|
| DuPage County, Illinois
|
921,213
|
| Will County, Illinois
|
700,728
|
| McHenry County, Illinois
|
312,800
|
| Grundy County, Illinois
|
53,578
|
| Kane County, Illinois
|
514,982
|
Elgin, IL MD
|
755,246
|
| Kendall County, Illinois
|
139,976
|
| DeKalb County, Illinois
|
100,288
|
| Lake County, Indiana
|
500,598
|
Lake County-Porter County-Jasper County, IN MD
|
723,428
|
| Porter County, Indiana
|
175,335
|
| Jasper County, Indiana
|
33,535
|
| Newton County, Indiana
|
13,960
|
| Lake County, Illinois
|
708,760
|
Lake County, IL MD
|
708,760
|
| Kenosha, WI MSA
|
167,488
|
Kenosha County, Wisconsin
|
167,488
|
none
|
| Ottawa, IL μSA
|
146,599
|
LaSalle County, Illinois
|
108,309
|
| Bureau County, Illinois
|
32,729
|
| Putnam County, Illinois
|
5,561
|
| Michigan City-La Porte, IN MSA
|
111,706
|
LaPorte County, Indiana
|
111,706
|
| Kankakee-Bradley, IL MSA
|
105,940
|
Kankakee County, Illinois
|
105,940
|
| St. Louis-St. Charles-Farmington, MO-IL CSA
|
2,900,730Template:Efn[1]
708,061 (IL)
|
St. Louis, MO-IL MSA
|
2,796,999
671,388 (IL)
|
St. Louis County, Missouri
|
987,059
|
| St. Charles County, Missouri
|
416,659
|
| City of St. Louis, Missouri
|
281,754
|
| Madison County, Illinois
|
262,752
|
| St. Clair County, Illinois
|
251,018
|
| Jefferson County, Missouri
|
231,230
|
| Franklin County, Missouri
|
106,404
|
| Lincoln County, Missouri
|
64,699
|
| Macoupin County, Illinois
|
44,018
|
| Warren County, Missouri
|
37,806
|
| Clinton County, Illinois
|
36,785
|
| Monroe County, Illinois
|
34,957
|
| Jersey County, Illinois
|
21,091
|
| Bond County, Illinois
|
16,450
|
| Calhoun County, Illinois
|
4,317
|
| Farmington, MO μSA
|
67,058
|
Saint Francois County, Missouri
|
67,058
|
| Centralia, IL μSA
|
36,673
|
Marion County, Illinois
|
36,673
|
| Rockford-Freeport-Rochelle, IL CSA
|
428,494
|
Rockford, IL MSA
|
334,124
|
Winnebago County, Illinois
|
280,922
|
| Boone County, Illinois
|
53,202
|
| Rochelle, IL μSA
|
51,265
|
Ogle County, Illinois
|
51,265
|
| Freeport, IL μSA
|
43,105
|
Stephenson County, Illinois
|
43,105
|
| Peoria-Canton, IL CSA
|
394,781
|
Peoria, IL MSA
|
362,240
|
Peoria County, Illinois
|
177,513
|
| Tazewell County, Illinois
|
129,541
|
| Woodford County, Illinois
|
38,285
|
| Marshall County, Illinois
|
11,683
|
| Stark County, Illinois
|
5,218
|
| Canton, IL μSA
|
32,541
|
Fulton County, Illinois
|
32,541
|
| Champaign-Urbana-Danville, IL CSA
|
307,260
|
Champaign-Urbana, IL MSA
|
235,608
|
Champaign County, Illinois
|
205,644
|
| Piatt County, Illinois
|
16,714
|
| Ford County, Illinois
|
13,250
|
| Danville, IL μSA
|
71,652
|
Vermilion County, Illinois
|
71,652
|
| Springfield-Jacksonville-Lincoln, IL CSA
|
303,113
|
Springfield, IL MSA
|
205,445
|
Sangamon County, Illinois
|
193,491
|
| Menard County, Illinois
|
11,954
|
| Jacksonville, IL μSA
|
36,850
|
Morgan County, Illinois
|
32,140
|
| Scott County, Illinois
|
4,710
|
| Taylorville, IL μSA
|
33,228
|
Christian County, Illinois
|
33,228
|
| Lincoln, IL μSA
|
27,590
|
Logan County, Illinois
|
27,590
|
| Bloomington-Pontiac, IL CSA
|
205,761
|
Bloomington, IL MSA
|
170,441
|
McLean County, Illinois
|
170,441
|
| Pontiac, IL μSA
|
35,320
|
Livingston County, Illinois
|
35,320
|
| Davenport-Moline, IA-IL CSA
|
467,817
205,171 (IL)
|
Davenport-Moline-Rock Island, IA-IL MSA
|
379,441
205,171 (IL)
|
Scott County, Iowa
|
174,270
|
| Rock Island County, Illinois
|
141,236
|
| Henry County, Illinois
|
48,448
|
| Mercer County, Illinois
|
15,487
|
| Clinton, IA μSA
|
46,158
|
Clinton County, Iowa
|
46,158
|
| Muscatine, IA μSA
|
42,218
|
Muscatine County, Iowa
|
42,218
|
| Carbondale-Marion-Herrin, IL CSA
|
118,847
|
Marion-Herrin, IL μSA
|
66,706
|
Williamson County, Illinois
|
66,706
|
| Carbondale, IL μSA
|
52,141
|
Jackson County, Illinois
|
52,141
|
| none
|
Decatur, IL MSA
|
100,591
|
Macon County, Illinois
|
100,591
|
| Dixon-Sterling, IL CSA
|
88,152
|
Sterling, IL μSA
|
54,498
|
Whiteside County, Illinois
|
54,498
|
| Dixon, IL μSA
|
33,654
|
Lee County, Illinois
|
33,654
|
| Quincy-Hannibal, IL-MO CSA
|
113,084
64,441 (IL)
|
Quincy, IL-MO μSA
|
74,259
64,441 (IL)
|
Adams County, Illinois
|
64,441
|
| Lewis County, Missouri
|
9,818
|
| Hannibal, MO μSA
|
38,825
|
Marion County, Missouri
|
28,336
|
| Ralls County, Missouri
|
10,489
|
| none
|
Galesburg, IL μSA
|
48,411
|
Knox County, Illinois
|
48,411
|
| Charleston–Mattoon, IL μSA
|
46,060
|
Coles County, Illinois
|
46,060
|
| Effingham, IL μSA
|
44,592
|
Effingham County, Illinois
|
34,331
|
| Cumberland County, Illinois
|
10,261
|
| Mount Vernon, IL μSA
|
36,320
|
Jefferson County, Illinois
|
36,320
|
| Macomb, IL μSA
|
26,839
|
McDonough County, Illinois
|
26,839
|
| Paducah-Mayfield, KY-IL CSA
|
138,728
13,661 (IL)
|
Paducah, KY-IL MSA
|
102,267
13,661 (IL)
|
McCracken County, Kentucky
|
67,428
|
| Massac County, Illinois
|
13,661
|
| Livingston County, Kentucky
|
8,892
|
| Ballard County, Kentucky
|
7,582
|
| Carlisle County, Kentucky
|
4,704
|
| Mayfield, KY μSA
|
36,461
|
Graves County, Kentucky
|
36,461
|
| Burlington-Fort Madison, IA-IL CSA
|
76,906
6,088 (IL)
|
Burlington, IA-IL μSA
|
44,341
6,088 (IL)
|
Des Moines County, Iowa
|
38,253
|
| Henderson County, Illinois
|
6,088
|
| Fort Madison, IA μSA
|
32,565
|
Lee County, Iowa
|
32,565
|
| Cape Girardeau-Sikeston, MO-IL CSA
|
147,934
4,695 (IL)
|
Cape Girardeau, MO-IL MSA
|
98,223
4,695 (IL)
|
Cape Girardeau County, Missouri
|
82,984
|
| Bollinger County, Missouri
|
10,544
|
| Alexander County, Illinois
|
4,695
|
| Sikeston, MO μSA
|
49,711
|
Scott County, Missouri
|
37,889
|
| Mississippi County, Missouri
|
11,822
|
| none
|
Franklin County, Illinois
|
37,138
|
| Randolph County, Illinois
|
29,815
|
| Montgomery County, Illinois
|
27,663
|
| Iroquois County, Illinois
|
26,136
|
| Saline County, Illinois
|
22,873
|
| Jo Daviess County, Illinois
|
21,756
|
| Fayette County, Illinois
|
21,164
|
| Shelby County, Illinois
|
20,568
|
| Perry County, Illinois
|
20,503
|
| Douglas County, Illinois
|
19,629
|
| Crawford County, Illinois
|
18,300
|
| Hancock County, Illinois
|
17,186
|
| Union County, Illinois
|
16,667
|
| Edgar County, Illinois
|
16,334
|
| Warren County, Illinois
|
16,185
|
| Wayne County, Illinois
|
15,761
|
| Carroll County, Illinois
|
15,526
|
| Richland County, Illinois
|
15,488
|
| DeWitt County, Illinois
|
15,365
|
| Clark County, Illinois
|
15,088
|
| Lawrence County, Illinois
|
14,813
|
| Moultrie County, Illinois
|
14,342
|
| Pike County, Illinois
|
14,342
|
| Washington County, Illinois
|
13,536
|
| White County, Illinois
|
13,401
|
| Johnson County, Illinois
|
13,326
|
| Clay County, Illinois
|
12,999
|
| Cass County, Illinois
|
12,596
|
| Mason County, Illinois
|
12,523
|
| Greene County, Illinois
|
11,543
|
| Wabash County, Illinois
|
10,942
|
| Jasper County, Illinois
|
9,144
|
| Hamilton County, Illinois
|
7,911
|
| Schuyler County, Illinois
|
6,733
|
| Brown County, Illinois
|
6,294
|
| Edwards County, Illinois
|
5,968
|
| Pulaski County, Illinois
|
4,911
|
| Gallatin County, Illinois
|
4,670
|
| Pope County, Illinois
|
3,707
|
| Hardin County, Illinois
|
3,569
|
| State of Illinois
|
12,549,689
|