Question: where is the telephone area code 571 located
Answer: 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 .