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. [1]
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.
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 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.
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 March 6, 2020, the OMB delineated seven combined statistical areas, 14 metropolitan statistical areas, and 13 micropolitan statistical areas in New York.
The U.S. State of Connecticut currently has nine 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, five metropolitan statistical areas, and two micropolitan statistical areas in Connecticut. As of 2023, the largest of these in the state is the New Haven-Hartford-Waterbury, CT CSA, encompassing the entire state outside of the Bridgeport-Stamford-Danbury, CT MSA in the southwest.
The U.S. State of Arizona currently has 13 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, seven metropolitan statistical areas, and four micropolitan statistical areas in Arizona. As of 2023, the most populous of these is the Phoenix-Mesa, AZ Combined Statistical Area, encompassing the area around Arizona's capital and largest city, Phoenix.
The U.S. State of Hawaiʻi currently has four statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated two metropolitan statistical areas and two micropolitan statistical areas in Hawaiʻi. As of 2023, the most populous of these is the Urban Honolulu, HI MSA, anchored by Hawaiʻi's capital and largest city, Honolulu, on the island of Oahu.
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 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 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 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 four combined statistical areas, 12 metropolitan statistical areas, and four micropolitan statistical areas in Virginia.
The U.S. State of Maryland currently has 13 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, six metropolitan statistical areas, and four micropolitan statistical areas in Maryland. 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 as well as Maryland's largest city of Baltimore.
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. As of 2023, the largest of these is the Portland-Lewiston-South Portland, ME CSA, comprising the region around Maine's largest city of Portland.
The U.S. State of Oklahoma currently has 26 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated four combined statistical areas, five metropolitan statistical areas, and 17 micropolitan statistical areas in Oklahoma.
The U.S. State of Oregon currently has 24 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated four combined statistical areas, eight metropolitan statistical areas, and 12 micropolitan statistical areas in Oregon.
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.
The United States federal government defines and delineates the nation's metropolitan areas for statistical purposes, using a set of standard statistical area definitions. As of 2023, the U.S. Office of Management and Budget (OMB) defined and delineated 393 metropolitan statistical areas (MSAs) and 542 micropolitan statistical areas (μSAs) in the United States and Puerto Rico. Many of these 935 MSAs and μSAs are, in turn, components of larger combined statistical areas (CSAs) consisting of adjacent MSAs and μSAs that are linked by commuting ties; as of 2023, 582 metropolitan and micropolitan areas are components of the 184 defined CSAs. A collective term for MSAs, μSAs, and CSAs is primary statistical areas (PSAs), though that term is not used by OMB.
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