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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 blue area is assigned area codes 301, 240, and 227; the red area is area codes 410, 443 and 667 ... including its suburbs of Washington, D.C. 410 443 667: eastern ...
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 ...
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 and its capital, Annapolis.
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
Map of racial distribution in the Washington metropolitan area, according to the 2010 U.S. census; each dot represents 25 people: White, Black, Asian, Hispanic or Other (yellow) 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 ...
The region's continued growth in the 1990s ultimately led to both suburban area codes being overlaid, with area code 240 overlaying 301 in 1997, and area code 571 overlaying 703 in 2000. Years after the introduction of mobile number portability, many cell phone customers on the Virginia and Maryland sides of the metro have 202 numbers.
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 ]