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.
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 31 statistical areas of Iowa, 15 are PSAs comprising seven combined statistical areas, two metropolitan statistical areas and six micropolitan statistical areas.
| 2020 rank | Primary 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 | Waterloo-Cedar Falls, IA MSA | 168,162 | −0.18% | 168,461 | +0.38% | 167,819 |
| 5 | Sioux City-Le Mars, IA-NE-SD CSA (IA) | 131,673 | +0.03% | 131,639 | +3.52% | 127,158 |
| 6 | Omaha-Fremont, NE-IA CSA (IA) | 122,482 | −0.20% | 122,733 | −0.33% | 123,145 |
| 7 | Dubuque, IA MSA | 98,887 | −0.38% | 99,266 | +5.99% | 93,653 |
| 8 | Burlington-Fort Madison, IA-IL CSA (IA) | 70,818 | −2.27% | 72,465 | −4.89% | 76,187 |
| 9 | Mason City, IA μSA | 49,703 | −1.71% | 50,570 | −2.28% | 51,749 |
| 10 | Marshall, IA μSA | 40,014 | −0.23% | 40,105 | −1.34% | 40,648 |
| 11 | Fort Dodge, IA μSA | 36,485 | −1.39% | 36,999 | −2.67% | 38,013 |
| 12 | Ottumwa, IA μSA | 35,166 | −0.76% | 35,437 | −0.53% | 35,625 |
| 13 | Spencer-Spirit Lake, IA CSA | 34,567 | +1.41% | 34,087 | +2.26% | 33,334 |
| 14 | Storm Lake, IA μSA | 20,567 | −1.23% | 20,823 | +2.78% | 20,260 |
| 15 | Carroll, IA μSA | 20,522 | −1.15% | 20,760 | −0.27% | 20,816 |
| Davenport-Moline, IA-IL CSA | 467,817 | −1.31% | 474,019 | +0.74% | 470,527 | |
| Sioux City-Le Mars, IA-NE-SD CSA | 170,124 | +0.05% | 170,032 | +4.59% | 162,563 | |
| Omaha-Fremont, NE-IA CSA | 1,021,156 | +1.63% | 1,004,771 | +11.39% | 902,041 | |
| Burlington-Fort Madison, IA-IL CSA | 76,906 | −2.47% | 78,852 | −5.59% | 83,518 | |
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 Michigan currently has 43 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated eight combined statistical areas, 16 metropolitan statistical areas, and 19 micropolitan statistical areas in Michigan. As of 2023, the largest of these was the Detroit-Warren-Ann Arbor, MI CSA, comprising the area surrounding Michigan's largest city, Detroit.
The United States Commonwealth of Kentucky currently has 32 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 8 combined statistical areas, 9 metropolitan statistical areas, and 15 micropolitan statistical areas in Kentucky. As of 2023, the largest of these is the Louisville-Jefferson County--Elizabethtown, KY-IN CSA, comprising greater Louisville, Kentucky's largest city.
The U.S. State of Mississippi currently has 27 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated six combined statistical areas, four metropolitan statistical areas, and 17 micropolitan statistical areas in Mississippi. As of 2023, the most populous statistical area in the state is Jackson-Vicksburg-Brookhaven, MS CSA, comprising the metro area of its capital and largest city, Jackson.
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 34 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 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 Kansas currently has 25 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, seven metropolitan statistical areas, and 15 micropolitan statistical areas in Kansas. As of 2023, the largest of these is the Kansas City-Overland Park-Kansas City, MO-KS CSA, comprising the area around Kansas City, Missouri.
The United States Commonwealth of Massachusetts currently has 12 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated two combined statistical area, seven metropolitan statistical areas, and three micropolitan statistical area in Massachusetts. As of 2023, the largest of these is the Boston-Worcester-Providence, MA-RI-NH CSA, comprising the area around Massachusetts' capital and largest city of Boston.
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 Nevada currently has ten statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated two combined statistical areas, three metropolitan statistical areas, and five micropolitan statistical areas in Nevada. As of 2023, the largest of these is the Las Vegas-Henderson, NV CSA, comprising the area around Nevada's largest city, Las Vegas.
The U.S. State of Louisiana currently has 25 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated six combined statistical areas, ten metropolitan statistical areas, and nine micropolitan statistical areas in Louisiana. As of 2023, the largest of these is the New Orleans-Metairie-Slidell, LA-MS CSA, comprising the area around New Orleans in the southeast region of the state.
The U.S. State of Minnesota currently has 34 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated six combined statistical areas, nine metropolitan statistical areas, and 19 micropolitan statistical areas in Minnesota. As of 2023, the largest of these is the Minneapolis-St. Paul, MN-WI CSA, comprising the area around the state's twin cities - Minneapolis, its largest city, and St. Paul, its capital.
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 New Hampshire currently has eight statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated two combined statistical areas, two metropolitan statistical areas, and four micropolitan statistical areas in New Hampshire. As of 2023, the largest of these is the Boston-Worcester-Providence, MA-RI-NH CSA, comprising the area around Boston; this area includes Manchester, New Hampshire's largest city, and Concord, its capital.
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