Area codes 703 and 571

703571571 & 703571, 703area code 703703, 571571 and 703571/703area code
Area codes 703 and 571 are the North American Numbering Plan telephone area codes for northern Virginia, including the independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park, as well as all of Arlington and Fairfax counties and parts of Fauquier, Loudoun, Prince William, and Stafford counties.wikipedia
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Overlay plan

overlayoverlaidoverlay area code
Area code 571 was created on March 1, 2000 as an overlay to 703.
Every number in Maryland's area code 301 and northern Virginia's 703 was given a "hidden" phone number consisting of the same number in the D.C.'s area code 202, essentially making area code 202 an overlay for the entire region.

Alexandria, Virginia

AlexandriaAlexandria, VAAlexandria City
Area codes 703 and 571 are the North American Numbering Plan telephone area codes for northern Virginia, including the independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park, as well as all of Arlington and Fairfax counties and parts of Fauquier, Loudoun, Prince William, and Stafford counties.

Fairfax, Virginia

FairfaxFairfax, VAFairfax City
Area codes 703 and 571 are the North American Numbering Plan telephone area codes for northern Virginia, including the independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park, as well as all of Arlington and Fairfax counties and parts of Fauquier, Loudoun, Prince William, and Stafford counties.

Falls Church, Virginia

Falls ChurchFalls Church CityCity of Falls Church
Area codes 703 and 571 are the North American Numbering Plan telephone area codes for northern Virginia, including the independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park, as well as all of Arlington and Fairfax counties and parts of Fauquier, Loudoun, Prince William, and Stafford counties.

Manassas, Virginia

ManassasManassas JunctionManassas, VA
Area codes 703 and 571 are the North American Numbering Plan telephone area codes for northern Virginia, including the independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park, as well as all of Arlington and Fairfax counties and parts of Fauquier, Loudoun, Prince William, and Stafford counties.

Area codes 410, 443, and 667

410, 443, and 667410410 & 443
A similar decision was made almost two decades later when Maryland's area code 301 was split; Baltimore and points east were assigned to area code 410 in order to allow federal agencies on the Maryland side of the metro to keep their current numbers.
Every number assigned on the Maryland side of the metro, as well as in northern Virginia's area code 703, was given a "hidden" number in 202, making it possible to complete a call within the metro area with only seven digits.

Area codes 301 and 240

301240 & 301240
A similar decision was made almost two decades later when Maryland's area code 301 was split; Baltimore and points east were assigned to area code 410 in order to allow federal agencies on the Maryland side of the metro to keep their current numbers.
From 1947 to 1990, the telephone numbering plan of the entire Washington metropolitan area, including Washington, D.C. (area code 202), and the large suburban areas in Maryland and Virginia (area code 703), operated in a system of central office code protection, meaning that no central office code in Washington D.C., and in the Maryland and Virginia suburbs could exist in more than a single central office.

Area code 804

804804 area codeits telephone area code
On June 24, 1973, area code 703 underwent its first split, when the eastern portion of the state became area code 804.
Area code 804 was split from Virginia's original area code, area code 703, on Sunday, June 24, 1973, with an official permissive dialing period ending January 1, 1974.