Question: Where is the telephone area code 571 located?
Disambiguated questions and answers: question: What counties is the telephone area code 571 located?
What cities is the telephone area code 571 located?
What General area has the area code 571?
answer: Fauquier
Loudoun
Prince William
Stafford
Arlington
Fairfax
Alexandria
Fairfax
Falls Church
Manassas
Manassas Park
Northern Virginia
NOVA
Natural Questions answer: northern Virginia (from the Wikipedia article "Area codes 571 and 703")