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The United States Office of Management and Budget (OMB) has defined 925 core-based statistical areas (CBSAs) for the United States and 10 for Puerto Rico. [1] The OMB defines a core-based statistical area as one or more adjacent counties or county equivalents that have at least one urban core area of at least 10,000 population, plus adjacent territory that has a high degree of social and economic integration with the core as measured by commuting ties. The 935 core-based statistical areas currently defined by the OMB include the 393 metropolitan statistical areas (MSAs), [2] which have an urban core population of at least 50,000, and the 542 micropolitan statistical areas (μSAs), [3] which have an urban core population of at least 10,000 but less than 50,000.
The following sortable table lists the 925 core-based statistical areas (CBSAs) of the United States with the following information:
See the distribution of statistical areas for the number of core-based statistical areas by state.
The following sortable table lists the 10 core-based statistical areas (CBSAs) of Puerto Rico with the following information:
Rank | Core-based statistical area | 2023 estimate | 2020 census | Change | Encompassing combined statistical area |
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1 | San Juan-Bayamón-Caguas, PR MSA | 2,035,733 | 2,081,265 | −2.19% | San Juan-Bayamón, PR |
2 | Ponce, PR MSA | 266,237 | 278,477 | −4.40% | Ponce-Coamo, PR |
3 | Aguadilla, PR MSA | 250,435 | 253,768 | −1.31% | Mayagüez-Aguadilla, PR |
4 | Mayagüez, PR MSA | 207,877 | 213,831 | −2.78% | Mayagüez-Aguadilla, PR |
5 | Arecibo, PR MSA | 179,470 | 182,705 | −1.77% | San Juan-Bayamón, PR |
6 | Guayama, PR MSA | 65,190 | 68,442 | −4.75% | San Juan-Bayamón, PR |
7 | Coamo, PR μSA | 53,355 | 54,949 | −2.90% | Ponce-Coamo, PR |
8 | Lares, PR μSA | 27,729 | 28,105 | −1.34% | San Juan-Bayamón, PR |
9 | Utuado, PR μSA | 27,242 | 28,287 | −3.69% | San Juan-Bayamón, PR |
10 | Coco, PR μSA | 24,718 | 25,789 | −4.15% | San Juan-Bayamón, PR |
In the United States, a metropolitan statistical area (MSA) is a geographical region with a relatively high population density at its core and close economic ties throughout the region. Such regions are not legally incorporated as a city or town would be and are not legal administrative divisions like counties or separate entities such as states. As a result, sometimes the precise definition of a given metropolitan area will vary between sources. The statistical criteria for a standard metropolitan area were defined in 1949 and redefined as a metropolitan statistical area in 1983.
Combined statistical area (CSA) is a United States Office of Management and Budget (OMB) term for a combination of adjacent metropolitan (MSA) and micropolitan statistical areas (μSA) across the 50 U.S. states and the territory of Puerto Rico that can demonstrate economic or social linkage. CSAs were first designated in 2003. OMB defines a CSA by various combinations of adjacent metropolitan and micropolitan areas with economic ties measured by commuting patterns. CSAs retain their own designations as metropolitan or micropolitan statistical areas in their respective larger combined statistical areas.
The U.S. State of Illinois currently has 43 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated 11 combined statistical areas, 13 metropolitan statistical areas, and 19 micropolitan statistical areas in Illinois.
The U.S. State of Montana currently has seven statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated five metropolitan statistical areas and two micropolitan statistical areas in Montana.
The U.S. State of Alabama currently has 37 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 9 combined statistical areas, 15 metropolitan statistical areas, and 13 micropolitan statistical areas in Alabama.
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.
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 ten micropolitan statistical areas in Idaho.
The U.S. State of Iowa currently has 30 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, nine metropolitan statistical areas, and 15 micropolitan statistical areas in Iowa.
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.
The United States Commonwealth of Massachusetts 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 area, seven metropolitan statistical areas, and three micropolitan statistical area in Massachusetts.
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.
The U.S. State of Maine currently has five 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, three metropolitan statistical areas, and one micropolitan statistical area in Maine.
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.
The U.S. State of New Mexico currently has 19 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, four metropolitan statistical areas, and 13 micropolitan statistical areas in New Mexico.
The U.S. State of North Carolina currently has 44 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, 16 metropolitan statistical areas, and 21 micropolitan statistical areas in North Carolina.
The U.S. State of North Dakota currently has nine 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, four metropolitan statistical areas, and four micropolitan statistical areas in North Dakota.
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.
The U.S. State of South Dakota currently has 14 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 nine micropolitan statistical areas in South Dakota.
The U.S. State of Vermont currently has six 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, one metropolitan statistical area, and five micropolitan statistical areas in Vermont.
The Commonwealth of Puerto Rico currently has 15 statistical areas that have been delineated by the United States Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated three combined statistical areas, eight metropolitan statistical areas, and four micropolitan statistical areas in Puerto Rico.