<P> 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 . The main area code, 703, was created as one of the original 86 North American area codes in October 1947, and originally served the entire Commonwealth of Virginia . Area code 571 was created on March 1, 2000 as an overlay to 703 . </P> <P> Because of the overlay of 703 and 571, 10 - digit dialing is mandatory even for local calls; cellphone callers do the same on all direct - dialled calls . Long - distance calls are dialed as eleven digits, using the prefix 1, but for landline - based phones only . </P>

Where is the telephone area code 571 located