Area codes::Washington metropolitan area
- 202 – Washington, D.C.
- 571/703 – Northern Virginia including the cities of Alexandria, Fairfax, and Falls Church as well as Arlington, Fairfax, and Loudoun counties (571 created 1 March 2000; 703 in October 1947).
- 240/301 – portions of Maryland in the Greater Washington, D.C. metro area, southern Maryland, and western Maryland
- 540 – Fredericksburg/Spotsylvania/Warrenton
- 304 – Jefferson County, West Virginia
Washington metropolitan area sections
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