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The population of the entire Washington–Baltimore Combined Statistical Area as of the 2020 census was 9,973,383. The area's most-populous city is Washington, D.C. with a population of 689,545, and the area's most populous county is Fairfax County, Virginia, with a population of 1,150,309. [10]
Area codes Numbering plan area 227 240 301: western Maryland, including its suburbs of Washington, D.C. 410 443 667: eastern Maryland including Baltimore and Annapolis
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 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
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The Washington metropolitan area, which includes the district and surrounding suburbs, is the sixth-largest metropolitan area in the U.S., with an estimated six million residents as of 2016. [143] When the Washington area is included with Baltimore and its suburbs, it forms the vast Washington–Baltimore combined statistical area.
The Baltimore–Columbia–Towson Metropolitan Statistical Area, also known as Central Maryland, is a metropolitan statistical area (MSA) in Maryland as defined by the United States Office of Management and Budget (OMB). It is part of the larger Washington–Baltimore combined statistical area. As of 2022, the combined population of the seven ...
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