The U.S. State of Iowa currently has 31 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated seven combined statistical areas, nine metropolitan statistical areas, and 15 micropolitan statistical areas in Iowa. [1] As of 2023, the largest of these is the Des Moines-West Des Moines-Ames, IA CSA, comprising the area around Iowa's capital and largest city, Des Moines.
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 following table provides the in-state population ranking of each CBSA along with its rate of population change over time.
| 2023 rank | Core-based statistical area [1] | Population | ||||
|---|---|---|---|---|---|---|
| 2023 estimate [3] | Change | 2020 Census [4] | Change | 2010 Census [5] | ||
| 1 | Des Moines-West Des Moines, IA MSA | 737,164 | +3.90% | 709,466 | +16.98% | 606,475 |
| 2 | Cedar Rapids, IA MSA | 275,668 | −0.31% | 276,520 | +7.20% | 257,940 |
| 3 | Iowa City, IA MSA | 180,088 | +2.66% | 175,419 | +14.96% | 152,586 |
| 4 | Davenport-Moline-Rock Island, IA-IL MSA (IA) | 174,270 | −0.23% | 174,669 | +5.72% | 165,224 |
| 5 | Waterloo-Cedar Falls, IA MSA | 168,162 | −0.18% | 168,461 | +0.38% | 167,819 |
| 6 | Ames, IA MSA | 125,156 | −0.08% | 125,252 | +8.12% | 115,848 |
| 7 | Omaha, NE-IA MSA (IA) | 122,482 | −0.20% | 122,733 | −0.33% | 123,145 |
| 8 | Sioux City, IA-NE-SD MSA (IA) | 105,951 | +0.01% | 105,941 | +3.69% | 102,172 |
| 9 | Dubuque, IA MSA | 98,887 | −0.38% | 99,266 | +5.99% | 93,653 |
| 10 | Mason City, IA μSA | 49,703 | −1.71% | 50,570 | −2.28% | 51,749 |
| 11 | Clinton, IA μSA | 46,158 | −0.65% | 46,460 | −5.41% | 49,116 |
| 12 | Muscatine, IA μSA | 42,218 | −2.35% | 43,235 | +1.15% | 42,745 |
| 13 | Marshalltown, IA μSA | 40,014 | −0.23% | 40,105 | −1.34% | 40,648 |
| 14 | Burlington, IA-IL μSA (IA) | 38,253 | −1.69% | 38,910 | −3.51% | 40,325 |
| 15 | Fort Dodge, IA μSA | 36,485 | −1.39% | 36,999 | −2.67% | 38,013 |
| 16 | Ottumwa, IA μSA | 35,166 | −0.76% | 35,437 | −0.53% | 35,625 |
| 17 | Pella, IA μSA | 33,770 | +1.07% | 33,414 | +0.32% | 33,309 |
| 18 | Fort Madison, IA μSA | 32,565 | −2.95% | 33,555 | −6.43% | 35,862 |
| 19 | Le Mars, IA μSA | 25,722 | +0.09% | 25,698 | +2.85% | 24,986 |
| 20 | Oskaloosa, IA μSA | 21,874 | −1.42% | 22,190 | −0.85% | 22,381 |
| 21 | Storm Lake, IA μSA | 20,567 | −1.23% | 20,823 | +2.78% | 20,260 |
| 22 | Carroll, IA μSA | 20,522 | −1.15% | 20,760 | −0.27% | 20,816 |
| 23 | Spirit Lake, IA μSA | 18,056 | +1.99% | 17,703 | +6.22% | 16,667 |
| 24 | Spencer, IA μSA | 16,511 | +0.78% | 16,384 | −1.70% | 16,667 |
| Burlington, IA-IL μSA | 44,341 | −2.11% | 45,297 | −4.95% | 47,656 | |
| Davenport-Moline-Rock Island, IA-IL MSA | 379,441 | −1.27% | 384,324 | +1.49% | 378,666 | |
| Omaha, NE-IA MSA | 983,969 | +1.69% | 967,604 | +11.82% | 865,350 | |
| Sioux City, IA-NE-SD MSA | 144,402 | +0.05% | 144,334 | +4.91% | 137,577 | |
The following table provides the in-state population ranking of each CSA along with its rate of population change over time.
| 2023 rank | Combined statistical area [1] | Population | ||||
|---|---|---|---|---|---|---|
| 2023 estimate [3] | Change | 2020 Census [4] | Change | 2010 Census [5] | ||
| 1 | Des Moines-West Des Moines-Ames, IA CSA | 917,964 | +3.10% | 890,322 | +14.44% | 778,013 |
| 2 | Cedar Rapids-Iowa City, IA CSA | 455,756 | +0.84% | 451,939 | +10.09% | 410,526 |
| 3 | Davenport-Moline, IA-IL CSA (IA) | 262,646 | −0.65% | 264,364 | +2.83% | 257,085 |
| 4 | Sioux City-Le Mars, IA-NE-SD CSA (IA) | 131,673 | +0.03% | 131,639 | +3.52% | 127,158 |
| 5 | Omaha-Fremont, NE-IA CSA (IA) | 122,482 | −0.20% | 122,733 | −0.33% | 123,145 |
| 6 | Burlington-Fort Madison, IA-IL CSA (IA) | 70,818 | −2.27% | 72,465 | −4.89% | 76,187 |
| 7 | Spencer-Spirit Lake, IA CSA | 34,567 | +1.41% | 34,087 | +2.26% | 33,334 |
| Burlington-Fort Madison, IA-IL CSA | 76,906 | −2.47% | 78,852 | −5.59% | 83,518 | |
| Davenport-Moline, IA-IL CSA | 467,817 | −1.31% | 474,019 | +0.74% | 470,527 | |
| Omaha-Fremont, NE-IA CSA | 1,021,156 | +1.63% | 1,004,771 | +11.39% | 902,041 | |
| Sioux City-Le Mars, IA-NE-SD CSA | 170,124 | +0.05% | 170,032 | +4.59% | 162,563 | |
The U.S. state of Indiana currently has 50 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated ten combined statistical areas, 15 metropolitan statistical areas, and 25 micropolitan statistical areas in Indiana. As of 2023, the largest of these was the Indianapolis-Carmel-Muncie, IN Combined Statistical Area, consisting of Indianapolis and its surrounding counties.
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.
The U.S. State of Ohio currently has 55 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 11 combined statistical areas, 15 metropolitan statistical areas, and 29 micropolitan statistical areas in Ohio. As of 2023, the largest of these is the Cleveland-Akron-Canton, OH CSA, comprising Cleveland and other cities in the northeast region of the state.
The United States Commonwealth of Pennsylvania currently has 48 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 12 combined statistical areas, 16 metropolitan statistical areas, and 20 micropolitan statistical areas in Pennsylvania. As of 2023, the largest of these is the Philadelphia-Reading-Camden, PA-NJ-DE-MD CSA, comprising the area around the state's largest city of Philadelphia in the southeast region of the state.
The U.S. state of New York currently has 34 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated seven combined statistical areas, 13 metropolitan statistical areas and 14 micropolitan statistical areas in New York. As of 2023, the largest of these is the New York-Newark, NY-NJ-CT-PA CSA, which includes New York City and its surrounding suburbs; with over 21 million people, it is the largest primary statistical area in the United States.
The U.S. State of Wisconsin currently has 40 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 11 combined statistical areas, 15 metropolitan statistical areas, and 14 micropolitan statistical areas in Wisconsin. As of 2023, the largest of these is the Milwaukee-Racine-Waukesha, WI CSA, comprising the area around the Wisconsin's largest city, Milwaukee.
The U.S. State of California currently has 42 statistical areas that have been delineated by the federal Office of Management and Budget (OMB).
The U.S. State of Alabama currently has 35 statistical areas that have been delineated by the Office of Management and Budget (OMB).
The U.S. State of Arkansas currently has 25 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated four combined statistical areas, seven metropolitan statistical areas, and 14 micropolitan statistical areas in Arkansas. As of 2023, the most populous statistical area in the state is Little Rock-North Little Rock, AR CSA, comprising the metro area of its capital and largest city, Little Rock.
The U.S. State of Delaware currently has four statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated one combined statistical area, two metropolitan statistical areas, and one micropolitan statistical area in Delaware. As of 2023, the largest statistical area in the state is the Philadelphia-Reading-Camden, PA-NJ-DE-MD Combined Statistical Area, which includes Delaware's largest city, Wilmington.
The United States District of Columbia(Washington, D.C.) is the primary city of two statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated the Washington-Arlington-Alexandria, DC-VA-MD-WV MSA and the more extensive Washington-Baltimore-Arlington, DC-MD-VA-WV-PA CSA.
The U.S. State of Florida currently has 35 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 7 combined statistical areas, 22 metropolitan statistical areas, and 6 micropolitan statistical areas in Florida. As of 2023, the largest of these is the Miami-Port St. Lucie-Fort Lauderdale, FL CSA, inclusive of the southeastern region of the state centered on Miami.
The U.S. State of Georgia currently has 46 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 7 combined statistical areas, 15 metropolitan statistical areas, and 24 micropolitan statistical areas within Georgia. As of 2023, the largest of these is the Atlanta--Athens-Clarke County--Sandy Springs, GA-AL CSA, encompassing 42 counties in Georgia and one in Alabama, anchored by Georgia's capital and largest city, Atlanta.
The U.S. State of Idaho currently has 22 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated five combined statistical areas, seven metropolitan statistical areas, and 10 micropolitan statistical areas in Idaho. As of 2023, the largest of these is the Boise City-Mountain Home-Ontario, ID-OR CSA, anchored by Idaho's capital and largest city, Boise.
The U.S. State of Virginia currently has 19 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated four combined statistical areas, 11 metropolitan statistical areas, and four micropolitan statistical areas in Virginia. As of 2023, the largest of these is the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA CSA, comprising Washington, D.C. and its suburbs.
The U.S. State of West Virginia currently has 20 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated five combined statistical areas, 10 metropolitan statistical areas, and five micropolitan statistical areas in West Virginia. As of 2023, the largest of these is the Charleston-Huntington-Ashland, WV-OH-KY CSA, which includes West Virginia's capital and largest city, Charleston.
The U.S. State of Missouri currently has 31 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated six combined statistical areas, seven metropolitan statistical areas, and 18 micropolitan statistical areas in Missouri. As of 2023, the largest of these is the St. Louis-St. Charles-Farmington, MO-IL CSA, comprising the area around St. Louis.
The U.S. State of Nebraska currently has 16 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated three combined statistical areas, four metropolitan statistical areas, and nine micropolitan statistical areas in Nebraska. As of 2023, the largest of these is the Omaha-Fremont, NE-IA CSA, comprising the area around Nebraska's largest city, Omaha.
The U.S. State of Oregon currently has 24 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated four combined statistical areas, eight metropolitan statistical areas, and 12 micropolitan statistical areas in Oregon. As of 2023, the largest of these is the Portland-Vancouver-Salem, OR-WA CSA, anchored by Oregon's largest city, Portland and including its capital, Salem.
The U.S. State of South Carolina currently has 20 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated four combined statistical areas, ten metropolitan statistical areas, and six micropolitan statistical areas in South Carolina. As of 2023, the largest of these is the Greenville-Spartanburg-Anderson, SC CSA, comprising the area around Greenville in the state's Upcountry.
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