The U.S. State of Illinois currently has 47 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 14 combined statistical areas , 12 metropolitan statistical areas , and 21 micropolitan statistical areas in Illinois.[ 1] As of 2023, the largest of these is the Chicago-Naperville, IL-IN-WI CSA , comprising the area around Illinois' largest city, Chicago .
The Office of Management and Budget (OMB) has designated more than 1,000 statistical areas for the United States and Puerto Rico .[ 2] These statistical areas are important geographic delineations of population clusters used by the OMB, the United States Census Bureau , planning organizations, and federal, state, and local government entities.
The OMB defines a core-based statistical area (commonly referred to as a CBSA ) as the county or counties (or county-equivalents ) surrounding at least one densely-settled core of at least 10,000 population,[ 2] "plus adjacent counties having a high degree of social and economic integration with the core as measured through commuting ties with the counties containing the core".[ 2] The OMB further divides core-based statistical areas based on population into metropolitan statistical areas (MSAs) for those with at least 50,000 and micropolitan statistical areas (μSAs) for those with 10,000 to 49,999 people.[ 2]
The OMB defines a combined statistical area (CSA) as two or more adjacent core-based statistical areas where the employment interchange rate (% commuting from A to B plus % commuting from B to A) is at least 15%.[ 2] The primary statistical areas (PSAs) include all combined statistical areas and any core-based statistical area that is not a constituent of a combined statistical area.
The 47 United States statistical areas and 102 counties of the State of Illinois [ a]
Combined statistical area[ 1]
2023 population (est.)[ 3]
Core-based statistical area[ 1]
2023 population (est.)[ 3]
County
2023 population (est.)[ 3]
Metropolitan division[ 1]
2023 population (est.)[ 3]
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
2,900,730 [ b] [ 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
Core-based statistical areas [ edit ]
The following table provides the in-state population ranking of each CBSA along with its rate of population change over time.
The 32 core-based statistical areas of the State of Illinois[ c]
2023 rank
Core-based statistical area [ 1]
Population
2023 estimate[ 3]
Change
2020 Census [ 4]
Change
2010 Census [ 5]
1
Chicago-Naperville-Elgin, IL-IN MSA (IL)
8,539,397
−2.19 %
8,730,688
+1.68 %
8,586,609
2
St. Louis, MO-IL MSA (IL)
671,388
−1.67 %
682,761
−2.97 %
703,664
3
Peoria, IL MSA
362,240
−1.77 %
368,782
−2.74 %
379,186
4
Rockford, IL MSA
334,124
−1.38 %
338,798
−3.04 %
349,431
5
Champaign-Urbana, IL MSA
235,608
−0.20 %
236,072
+1.80 %
231,891
6
Springfield, IL MSA
205,445
−1.53 %
208,640
−0.73 %
210,170
7
Davenport-Moline-Rock Island, IA-IL MSA (IL)
205,171
−2.14 %
209,655
−1.77 %
213,442
8
Bloomington, IL MSA
170,441
−0.30 %
170,954
+0.81 %
169,572
9
Ottawa, IL μSA
146,599
−1.31 %
148,539
−4.11 %
154,908
10
Kankakee, IL MSA
105,940
−1.45 %
107,502
−5.24 %
113,449
11
Decatur, IL MSA
100,591
−3.28 %
103,998
−6.11 %
110,768
12
Danville, IL μSA
71,652
−3.42 %
74,188
−9.11 %
81,625
13
Marion-Herrin, IL μSA
66,706
−0.67 %
67,153
+1.20 %
66,357
14
Quincy, IL-MO μSA (IL)
64,441
−1.97 %
65,737
−2.04 %
67,103
15
Sterling, IL μSA
54,498
−2.14 %
55,691
−4.80 %
58,498
16
Carbondale, IL μSA
52,141
−1.57 %
52,974
−12.03 %
60,218
17
Rochelle, IL μSA
51,265
−1.01 %
51,788
−3.19 %
53,497
18
Galesburg, IL μSA
48,411
−3.11 %
49,967
−5.58 %
52,919
19
Charleston-Mattoon, IL μSA
46,060
−1.71 %
46,863
−13.01 %
53,873
20
Effingham, IL μSA
44,592
−1.17 %
45,118
−0.38 %
45,290
21
Freeport, IL μSA
43,105
−3.42 %
44,630
−6.46 %
47,711
22
Jacksonville, IL μSA
36,850
−2.68 %
37,864
−7.43 %
40,902
23
Centralia, IL μSA
36,673
−2.80 %
37,729
−4.33 %
39,437
24
Mount Vernon, IL μSA
36,320
−2.14 %
37,113
−4.41 %
38,827
25
Pontiac, IL μSA
35,320
−1.38 %
35,815
−8.05 %
38,950
26
Taylorville, IL μSA
33,228
−2.36 %
34,032
−2.21 %
34,800
27
Canton, IL μSA
32,541
−3.18 %
33,609
−9.33 %
37,069
28
Lincoln, IL μSA
27,590
−1.42 %
27,987
−7.65 %
30,305
29
Macomb, IL μSA
26,839
−1.46 %
27,238
−16.48 %
32,612
30
Paducah, KY-IL μSA (IL)
13,661
−3.59 %
14,169
−8.17 %
15,429
31
Burlington, IA-IL μSA (IL)
6,088
−4.68 %
6,387
−12.88 %
7,331
32
Cape Girardeau, MO-IL μSA (IL)
4,695
−10.40 %
5,240
−36.39 %
8,238
Burlington, IA-IL μSA
44,341
−2.11 %
45,297
−4.95 %
47,656
Cape Girardeau, MO-IL μSA
98,223
+0.72 %
97,517
+1.29 %
96,275
Chicago-Naperville-Elgin, IL-IN MSA
9,262,825
−1.97 %
9,449,351
+1.66 %
9,294,679
Davenport-Moline-Rock Island, IA-IL MSA
379,441
−1.27 %
384,324
+1.49 %
378,666
Paducah, KY-IL μSA
102,267
−1.18 %
103,486
−0.37 %
103,866
Quincy, IL-MO μSA
74,259
−1.99 %
75,769
−2.00 %
77,314
St. Louis, MO-IL MSA
2,796,999
−0.82 %
2,820,253
+1.17 %
2,787,701
Combined statistical areas [ edit ]
The following table provides the in-state population ranking of each CSA along with its rate of population change over time.
The 14 combined statistical areas of the State of Illinois[ d]
2023 rank
Combined statistical area [ 1]
Population
2023 estimate[ 3]
Change
2020 Census [ 4]
Change
2010 Census [ 5]
1
Chicago-Naperville, IL-IN-WI CSA (IL)
8,791,936
−2.17 %
8,986,729
+1.49 %
8,854,966
2
St. Louis-St. Charles-Farmington, MO-IL CSA (IL)
708,061
−1.73 %
720,490
−3.04 %
743,101
3
Rockford-Freeport-Rochelle, IL CSA
428,494
−1.54 %
435,216
−3.42 %
450,639
4
Peoria-Canton, IL CSA
394,781
−1.89 %
402,391
−3.33 %
416,255
5
Champaign-Urbana-Danville, IL CSA
307,260
−0.97 %
310,260
−1.04 %
313,516
6
Springfield-Jacksonville-Lincoln, IL CSA
303,113
−1.75 %
308,523
−2.42 %
316,177
7
Davenport-Moline, IA-IL CSA (IL)
205,171
−2.14 %
209,655
−1.77 %
213,442
8
Bloomington-Pontiac, IL CSA
205,761
−0.49 %
206,769
−0.84 %
208,522
9
Carbondale-Marion-Herrin, IL CSA
118,847
−1.07 %
120,127
−5.09 %
126,575
10
Dixon-Sterling, IL CSA
88,152
−1.87 %
89,836
−4.96 %
94,529
11
Quincy-Hannibal, IL-MO CSA (IL)
64,441
−1.97 %
65,737
−2.04 %
67,103
12
Paducah-Mayfield, KY-IL CSA (IL)
13,661
−3.59 %
14,169
−8.17 %
15,429
13
Burlington-Fort Madison, IA-IL CSA (IL)
6,088
−4.68 %
6,387
−12.88 %
7,331
14
Cape Girardeau-Sikeston, MO-IL CSA (IL)
4,695
−10.40 %
5,240
−36.39 %
8,238
Burlington-Fort Madison, IA-IL CSA
76,906
−2.47 %
78,852
−5.59 %
83,518
Cape Girardeau-Sikeston, MO-IL CSA
147,934
−0.15 %
148,153
−1.12 %
149,824
Chicago-Naperville, IL-IN-WI CSA
9,794,558
−1.93 %
9,986,960
+1.48 %
9,840,929
Davenport-Moline, IA-IL CSA
467,817
−1.31 %
474,019
+0.74 %
470,527
Paducah-Mayfield, KY-IL CSA
138,728
−1.00 %
140,135
−0.60 %
140,987
Quincy-Hannibal, IL-MO CSA
113,084
−1.37 %
114,649
−1.39 %
116,262
St. Louis-St. Charles-Farmington, MO-IL CSA
2,900,730
−0.83 %
2,924,904
+1.12 %
2,892,497
^ An out-of-state area and its population are displayed in green. An area that extends into more than one state is displayed in purple. A purple population number over a black population number show the total population versus the in-state population. The state's abbreviation is also shown next to the in-state total.
^ Per the most recent OMB bulletin, the portion of Sullivan, Missouri within Crawford County, Missouri is included in St. Louis' statistical areas. Population data for this portion of Sullivan is not readily available and is not included in this table.
^ For CBSAs comprising populations from multiple states, they are listed twice to show both their intrastate population within that CBSA as well as the CBSA's total population. Only the intrastate population is ranked.
^ For CSAs comprising populations from multiple states, they are listed twice to show both their intrastate population within that CSA as well as the CSA's total population. Only the intrastate population is ranked.
^ a b c d e f g Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas (July 21, 2023). "0MB BULLETIN NO. 23-01" (PDF) . Office of Management and Budget . Retrieved October 23, 2023 . {{cite web }}: CS1 maint: multiple names: authors list (link )
^ a b c d e "2020 Standards for Delineating Core Based Statistical Areas" . Office of Management and Budget . July 16, 2021. Retrieved December 13, 2021 .
^ a b c d e f "County Population Totals and Components of Change: 2020-2023" . United States Census Bureau , Population Division. March 2023. Retrieved May 21, 2024 .
^ a b "PROFILE OF GENERAL POPULATION AND HOUSING CHARACTERISTICS" . U.S. Census Bureau . 2020. Retrieved May 21, 2024 .
^ a b "Annual Estimates of the Resident Population for Counties: April 1, 2010 to July 1, 2019" . U.S. Census Bureau . 2019. Retrieved May 21, 2024 .
40°02′30″N 89°11′47″W / 40.0417°N 89.1965°W / 40.0417; -89.1965 (State of Illinois )