Area Code 703

703 is the area code for most of Northern Virginia, including the cities of Alexandria, Fairfax, Falls Church, and Manassas, the counties of Arlington and Fairfax, and parts of Fauquier County, eastern Loudon, Prince William and Stafford. 703 used to serve the entire state of Virginia, until 1973 when area code 804 was split from it. 703 is overlaid by area code 571, and all calls must be dialed using 10 digits.