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.
More information Combined statistical area, 2023 population (est.) ...
The 47 United States statistical areas and 102 counties of the State of Illinois[lower-alpha 1]
| 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[lower-alpha 2][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 MSA |
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 |
Close
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. Of the 47 statistical areas of Illinois, 20 are PSAs comprising 14 combined statistical areas, one metropolitan statistical area and five micropolitan statistical areas.
More information 2020 rank, Primary statistical area ...
The 20 primary statistical areas of the State of Illinois[lower-alpha 3]
| 2020 rank |
Primary 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 |
Decatur, IL MSA |
100,591 | −3.28% | 103,998 | −6.11% | 110,768 |
| 11 |
Dixon-Sterling, IL CSA |
88,152 | −1.87% | 89,836 | −4.96% | 94,529 |
| 12 |
Quincy-Hannibal, IL-MO CSA (IL) |
64,441 | −1.97% | 65,737 | −2.04% | 67,103 |
| 13 |
Galesburg, IL μSA |
48,411 | −3.11% | 49,967 | −5.58% | 52,919 |
| 14 |
Charleston-Mattoon, IL μSA |
46,060 | −1.71% | 46,863 | −13.01% | 53,873 |
| 15 |
Effingham, IL μSA |
44,592 | −1.17% | 45,118 | −0.38% | 45,290 |
| 16 |
Mount Vernon, IL μSA |
36,320 | −2.14% | 37,113 | −4.41% | 38,827 |
| 17 |
Macomb, IL μSA |
26,839 | −1.46% | 27,238 | −16.48% | 32,612 |
| 18 |
Paducah-Mayfield, KY-IL CSA (IL) |
13,661 | −3.59% | 14,169 | −8.17% | 15,429 |
| 19 |
Burlington-Fort Madison, IA-IL CSA (IL) |
6,088 | −4.68% | 6,387 | −12.88% | 7,331 |
| 20 |
Cape Girardeau-Sikeston, MO-IL CSA (IL) |
4,695 | −10.40% | 5,240 | −36.39% | 8,238 |
|
Chicago-Naperville, IL-IN-WI CSA |
9,794,558 | −1.93% | 9,986,960 | +1.48% | 9,840,929 |
|
St. Louis-St. Charles-Farmington, MO-IL CSA |
2,900,730 | −0.83% | 2,924,904 | +1.12% | 2,892,497 |
|
Davenport-Moline, IA-IL CSA |
467,817 | −1.31% | 474,019 | +0.74% | 470,527 |
|
Quincy-Hannibal, IL-MO CSA |
113,084 | −1.37% | 114,649 | −1.39% | 116,262 |
|
Paducah-Mayfield, KY-IL CSA |
138,728 | −1.00% | 140,135 | −0.60% | 140,987 |
|
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 |
Close
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 PSAs comprising populations from multiple states, they are listed twice to show both their intrastate population within that PSA as well as the PSA's total population. Only the intrastate population is ranked.
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)
