# Illinois statistical areas

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. As of 2023, the largest of these is the Chicago-Naperville, IL-IN-WI CSA, comprising the area around Illinois' largest city, Chicago.

## Background

The Office of Management and Budget (OMB) has designated more than 1,000 statistical areas for the United States and Puerto Rico. 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, "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". 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.
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%. 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.

## Table

The 47 United States statistical areas and 102 counties of the State of Illinois :
| Combined statistical area | 2023 population (est.) | Core-based statistical area | 2023 population (est.) | County | 2023 population (est.) | Metropolitan division | 2023 population (est.) |
| 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 |
| 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) | DuPage County, Illinois | 921,213 | Chicago-Naperville-Schaumburg, IL MD | 7,075,391 |
| 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) | Will County, Illinois | 700,728 | Chicago-Naperville-Schaumburg, IL MD | 7,075,391 |
| 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) | McHenry County, Illinois | 312,800 | Chicago-Naperville-Schaumburg, IL MD | 7,075,391 |
| 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) | Grundy County, Illinois | 53,578 | Chicago-Naperville-Schaumburg, IL MD | 7,075,391 |
| 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) | Kane County, Illinois | 514,982 | Elgin, IL MD | 755,246 |
| 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) | Kendall County, Illinois | 139,976 | Elgin, IL MD | 755,246 |
| 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) | DeKalb County, Illinois | 100,288 | Elgin, IL MD | 755,246 |
| 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) | Lake County, Indiana | 500,598 | Lake County-Porter County-Jasper County, IN MD | 723,428 |
| 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) | Porter County, Indiana | 175,335 | Lake County-Porter County-Jasper County, IN MD | 723,428 |
| 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) | Jasper County, Indiana | 33,535 | Lake County-Porter County-Jasper County, IN MD | 723,428 |
| 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) | Newton County, Indiana | 13,960 | Lake County-Porter County-Jasper County, IN MD | 723,428 |
| 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) | Lake County, Illinois | 708,760 | Lake County, IL MD | 708,760 |
| Chicago-Naperville, IL-IN-WI CSA | 9,794,558 8,791,936 (IL) | Kenosha, WI MSA | 167,488 | Kenosha County, Wisconsin | 167,488 | none | none |
| Chicago-Naperville, IL-IN-WI CSA | 9,794,558 8,791,936 (IL) | Ottawa, IL μSA | 146,599 | LaSalle County, Illinois | 108,309 | none | none |
| Chicago-Naperville, IL-IN-WI CSA | 9,794,558 8,791,936 (IL) | Ottawa, IL μSA | 146,599 | Bureau County, Illinois | 32,729 | none | none |
| Chicago-Naperville, IL-IN-WI CSA | 9,794,558 8,791,936 (IL) | Ottawa, IL μSA | 146,599 | Putnam County, Illinois | 5,561 | none | none |
| Chicago-Naperville, IL-IN-WI CSA | 9,794,558 8,791,936 (IL) | Michigan City-La Porte, IN MSA | 111,706 | LaPorte County, Indiana | 111,706 | none | none |
| Chicago-Naperville, IL-IN-WI CSA | 9,794,558 8,791,936 (IL) | Kankakee-Bradley, IL MSA | 105,940 | Kankakee County, Illinois | 105,940 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | St. Louis County, Missouri | 987,059 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | St. Charles County, Missouri | 416,659 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | City of St. Louis, Missouri | 281,754 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Madison County, Illinois | 262,752 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | St. Clair County, Illinois | 251,018 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Jefferson County, Missouri | 231,230 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Franklin County, Missouri | 106,404 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Lincoln County, Missouri | 64,699 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Macoupin County, Illinois | 44,018 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Warren County, Missouri | 37,806 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Clinton County, Illinois | 36,785 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Monroe County, Illinois | 34,957 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Jersey County, Illinois | 21,091 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Bond County, Illinois | 16,450 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | St. Louis, MO-IL MSA | 2,796,999 671,388 (IL) | Calhoun County, Illinois | 4,317 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | Farmington, MO μSA | 67,058 | Saint Francois County, Missouri | 67,058 | none | none |
| St. Louis-St. Charles-Farmington, MO-IL CSA | 2,900,730 708,061 (IL) | Centralia, IL μSA | 36,673 | Marion County, Illinois | 36,673 | none | none |
| Rockford-Freeport-Rochelle, IL CSA | 428,494 | Rockford, IL MSA | 334,124 | Winnebago County, Illinois | 280,922 | none | none |
| Rockford-Freeport-Rochelle, IL CSA | 428,494 | Rockford, IL MSA | 334,124 | Boone County, Illinois | 53,202 | none | none |
| Rockford-Freeport-Rochelle, IL CSA | 428,494 | Rochelle, IL μSA | 51,265 | Ogle County, Illinois | 51,265 | none | none |
| Rockford-Freeport-Rochelle, IL CSA | 428,494 | Freeport, IL μSA | 43,105 | Stephenson County, Illinois | 43,105 | none | none |
| Peoria-Canton, IL CSA | 394,781 | Peoria, IL MSA | 362,240 | Peoria County, Illinois | 177,513 | none | none |
| Peoria-Canton, IL CSA | 394,781 | Peoria, IL MSA | 362,240 | Tazewell County, Illinois | 129,541 | none | none |
| Peoria-Canton, IL CSA | 394,781 | Peoria, IL MSA | 362,240 | Woodford County, Illinois | 38,285 | none | none |
| Peoria-Canton, IL CSA | 394,781 | Peoria, IL MSA | 362,240 | Marshall County, Illinois | 11,683 | none | none |
| Peoria-Canton, IL CSA | 394,781 | Peoria, IL MSA | 362,240 | Stark County, Illinois | 5,218 | none | none |
| Peoria-Canton, IL CSA | 394,781 | Canton, IL μSA | 32,541 | Fulton County, Illinois | 32,541 | none | none |
| Champaign-Urbana-Danville, IL CSA | 307,260 | Champaign-Urbana, IL MSA | 235,608 | Champaign County, Illinois | 205,644 | none | none |
| Champaign-Urbana-Danville, IL CSA | 307,260 | Champaign-Urbana, IL MSA | 235,608 | Piatt County, Illinois | 16,714 | none | none |
| Champaign-Urbana-Danville, IL CSA | 307,260 | Champaign-Urbana, IL MSA | 235,608 | Ford County, Illinois | 13,250 | none | none |
| Champaign-Urbana-Danville, IL CSA | 307,260 | Danville, IL μSA | 71,652 | Vermilion County, Illinois | 71,652 | none | none |
| Springfield-Jacksonville-Lincoln, IL CSA | 303,113 | Springfield, IL MSA | 205,445 | Sangamon County, Illinois | 193,491 | none | none |
| Springfield-Jacksonville-Lincoln, IL CSA | 303,113 | Springfield, IL MSA | 205,445 | Menard County, Illinois | 11,954 | none | none |
| Springfield-Jacksonville-Lincoln, IL CSA | 303,113 | Jacksonville, IL μSA | 36,850 | Morgan County, Illinois | 32,140 | none | none |
| Springfield-Jacksonville-Lincoln, IL CSA | 303,113 | Jacksonville, IL μSA | 36,850 | Scott County, Illinois | 4,710 | none | none |
| Springfield-Jacksonville-Lincoln, IL CSA | 303,113 | Taylorville, IL μSA | 33,228 | Christian County, Illinois | 33,228 | none | none |
| Springfield-Jacksonville-Lincoln, IL CSA | 303,113 | Lincoln, IL μSA | 27,590 | Logan County, Illinois | 27,590 | none | none |
| Bloomington-Pontiac, IL CSA | 205,761 | Bloomington, IL MSA | 170,441 | McLean County, Illinois | 170,441 | none | none |
| Bloomington-Pontiac, IL CSA | 205,761 | Pontiac, IL μSA | 35,320 | Livingston County, Illinois | 35,320 | none | none |
| 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 | none | none |
| Davenport-Moline, IA-IL CSA | 467,817 205,171 (IL) | Davenport-Moline-Rock Island, IA-IL MSA | 379,441 205,171 (IL) | Rock Island County, Illinois | 141,236 | none | none |
| Davenport-Moline, IA-IL CSA | 467,817 205,171 (IL) | Davenport-Moline-Rock Island, IA-IL MSA | 379,441 205,171 (IL) | Henry County, Illinois | 48,448 | none | none |
| Davenport-Moline, IA-IL CSA | 467,817 205,171 (IL) | Davenport-Moline-Rock Island, IA-IL MSA | 379,441 205,171 (IL) | Mercer County, Illinois | 15,487 | none | none |
| Davenport-Moline, IA-IL CSA | 467,817 205,171 (IL) | Clinton, IA μSA | 46,158 | Clinton County, Iowa | 46,158 | none | none |
| Davenport-Moline, IA-IL CSA | 467,817 205,171 (IL) | Muscatine, IA μSA | 42,218 | Muscatine County, Iowa | 42,218 | none | none |
| Carbondale-Marion-Herrin, IL CSA | 118,847 | Marion-Herrin, IL μSA | 66,706 | Williamson County, Illinois | 66,706 | none | none |
| Carbondale-Marion-Herrin, IL CSA | 118,847 | Carbondale, IL μSA | 52,141 | Jackson County, Illinois | 52,141 | none | none |
| none | none | Decatur, IL MSA | 100,591 | Macon County, Illinois | 100,591 | none | none |
| Dixon-Sterling, IL CSA | 88,152 | Sterling, IL μSA | 54,498 | Whiteside County, Illinois | 54,498 | none | none |
| Dixon-Sterling, IL CSA | 88,152 | Dixon, IL μSA | 33,654 | Lee County, Illinois | 33,654 | none | none |
| Quincy-Hannibal, IL-MO CSA | 113,084 64,441 (IL) | Quincy, IL-MO μSA | 74,259 64,441 (IL) | Adams County, Illinois | 64,441 | none | none |
| Quincy-Hannibal, IL-MO CSA | 113,084 64,441 (IL) | Quincy, IL-MO μSA | 74,259 64,441 (IL) | Lewis County, Missouri | 9,818 | none | none |
| Quincy-Hannibal, IL-MO CSA | 113,084 64,441 (IL) | Hannibal, MO μSA | 38,825 | Marion County, Missouri | 28,336 | none | none |
| Quincy-Hannibal, IL-MO CSA | 113,084 64,441 (IL) | Hannibal, MO μSA | 38,825 | Ralls County, Missouri | 10,489 | none | none |
| none | none | Galesburg, IL μSA | 48,411 | Knox County, Illinois | 48,411 | none | none |
| none | none | Charleston–Mattoon, IL μSA | 46,060 | Coles County, Illinois | 46,060 | none | none |
| none | none | Effingham, IL μSA | 44,592 | Effingham County, Illinois | 34,331 | none | none |
| none | none | Effingham, IL μSA | 44,592 | Cumberland County, Illinois | 10,261 | none | none |
| none | none | Mount Vernon, IL μSA | 36,320 | Jefferson County, Illinois | 36,320 | none | none |
| none | none | Macomb, IL μSA | 26,839 | McDonough County, Illinois | 26,839 | none | none |
| Paducah-Mayfield, KY-IL CSA | 138,728 13,661 (IL) | Paducah, KY-IL MSA | 102,267 13,661 (IL) | McCracken County, Kentucky | 67,428 | none | none |
| Paducah-Mayfield, KY-IL CSA | 138,728 13,661 (IL) | Paducah, KY-IL MSA | 102,267 13,661 (IL) | Massac County, Illinois | 13,661 | none | none |
| Paducah-Mayfield, KY-IL CSA | 138,728 13,661 (IL) | Paducah, KY-IL MSA | 102,267 13,661 (IL) | Livingston County, Kentucky | 8,892 | none | none |
| Paducah-Mayfield, KY-IL CSA | 138,728 13,661 (IL) | Paducah, KY-IL MSA | 102,267 13,661 (IL) | Ballard County, Kentucky | 7,582 | none | none |
| Paducah-Mayfield, KY-IL CSA | 138,728 13,661 (IL) | Paducah, KY-IL MSA | 102,267 13,661 (IL) | Carlisle County, Kentucky | 4,704 | none | none |
| Paducah-Mayfield, KY-IL CSA | 138,728 13,661 (IL) | Mayfield, KY μSA | 36,461 | Graves County, Kentucky | 36,461 | none | none |
| 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 | none | none |
| Burlington-Fort Madison, IA-IL CSA | 76,906 6,088 (IL) | Burlington, IA-IL μSA | 44,341 6,088 (IL) | Henderson County, Illinois | 6,088 | none | none |
| Burlington-Fort Madison, IA-IL CSA | 76,906 6,088 (IL) | Fort Madison, IA μSA | 32,565 | Lee County, Iowa | 32,565 | none | none |
| 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 | none | none |
| Cape Girardeau-Sikeston, MO-IL CSA | 147,934 4,695 (IL) | Cape Girardeau, MO-IL MSA | 98,223 4,695 (IL) | Bollinger County, Missouri | 10,544 | none | none |
| Cape Girardeau-Sikeston, MO-IL CSA | 147,934 4,695 (IL) | Cape Girardeau, MO-IL MSA | 98,223 4,695 (IL) | Alexander County, Illinois | 4,695 | none | none |
| Cape Girardeau-Sikeston, MO-IL CSA | 147,934 4,695 (IL) | Sikeston, MO μSA | 49,711 | Scott County, Missouri | 37,889 | none | none |
| Cape Girardeau-Sikeston, MO-IL CSA | 147,934 4,695 (IL) | Sikeston, MO μSA | 49,711 | Mississippi County, Missouri | 11,822 | none | none |
| none | none | none | none | Franklin County, Illinois | 37,138 | none | none |
| none | none | none | none | Randolph County, Illinois | 29,815 | none | none |
| none | none | none | none | Montgomery County, Illinois | 27,663 | none | none |
| none | none | none | none | Iroquois County, Illinois | 26,136 | none | none |
| none | none | none | none | Saline County, Illinois | 22,873 | none | none |
| none | none | none | none | Jo Daviess County, Illinois | 21,756 | none | none |
| none | none | none | none | Fayette County, Illinois | 21,164 | none | none |
| none | none | none | none | Shelby County, Illinois | 20,568 | none | none |
| none | none | none | none | Perry County, Illinois | 20,503 | none | none |
| none | none | none | none | Douglas County, Illinois | 19,629 | none | none |
| none | none | none | none | Crawford County, Illinois | 18,300 | none | none |
| none | none | none | none | Hancock County, Illinois | 17,186 | none | none |
| none | none | none | none | Union County, Illinois | 16,667 | none | none |
| none | none | none | none | Edgar County, Illinois | 16,334 | none | none |
| none | none | none | none | Warren County, Illinois | 16,185 | none | none |
| none | none | none | none | Wayne County, Illinois | 15,761 | none | none |
| none | none | none | none | Carroll County, Illinois | 15,526 | none | none |
| none | none | none | none | Richland County, Illinois | 15,488 | none | none |
| none | none | none | none | DeWitt County, Illinois | 15,365 | none | none |
| none | none | none | none | Clark County, Illinois | 15,088 | none | none |
| none | none | none | none | Lawrence County, Illinois | 14,813 | none | none |
| none | none | none | none | Moultrie County, Illinois | 14,342 | none | none |
| none | none | none | none | Pike County, Illinois | 14,342 | none | none |
| none | none | none | none | Washington County, Illinois | 13,536 | none | none |
| none | none | none | none | White County, Illinois | 13,401 | none | none |
| none | none | none | none | Johnson County, Illinois | 13,326 | none | none |
| none | none | none | none | Clay County, Illinois | 12,999 | none | none |
| none | none | none | none | Cass County, Illinois | 12,596 | none | none |
| none | none | none | none | Mason County, Illinois | 12,523 | none | none |
| none | none | none | none | Greene County, Illinois | 11,543 | none | none |
| none | none | none | none | Wabash County, Illinois | 10,942 | none | none |
| none | none | none | none | Jasper County, Illinois | 9,144 | none | none |
| none | none | none | none | Hamilton County, Illinois | 7,911 | none | none |
| none | none | none | none | Schuyler County, Illinois | 6,733 | none | none |
| none | none | none | none | Brown County, Illinois | 6,294 | none | none |
| none | none | none | none | Edwards County, Illinois | 5,968 | none | none |
| none | none | none | none | Pulaski County, Illinois | 4,911 | none | none |
| none | none | none | none | Gallatin County, Illinois | 4,670 | none | none |
| none | none | none | none | Pope County, Illinois | 3,707 | none | none |
| none | none | none | none | Hardin County, Illinois | 3,569 | none | none |
| State of Illinois | State of Illinois | State of Illinois | State of Illinois | State of Illinois | 12,549,689 | none | none |

## Core-based statistical areas

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 :
| 2023 rank | Core-based statistical area | Population | Population | Population | Population | Population |
| 2023 rank | Core-based statistical area | 2023 estimate | Change | 2020 Census | Change | 2010 Census |
| 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

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 :
| 2023 rank | Combined statistical area | Population | Population | Population | Population | Population |
| 2023 rank | Combined statistical area | 2023 estimate | Change | 2020 Census | Change | 2010 Census |
| 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 |