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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]
The eastern part of Washington is not as densely populated as the west side of the Cascades. As a result, 509 remained unchanged while the west side of the Cascades went from one area code to four from 1995 to 1997. However, the NANP Administrator has projected that 509's central office codes will exhaust by 2026. This is primarily due to the ...
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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Further splits in 1995 to create area code 360 for most of Western Washington, and 1997 to form area codes 253 and 425. 564 will be added to the 206 area in 2025. 509: January 1, 1957 [1] Eastern Washington, including Spokane, the Tri-Cities, Yakima, Walla Walla, and Wenatchee: Created in a split from area code 206. [2] 360: January 15, 1995 [3]
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 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.
Arlington (Major airport: Ronald Reagan Washington National Airport, Recognized as a "central city" by the U.S. Census Bureau) Suburbs with 10,000 to 100,000 inhabitants [ edit ]