What is what area code is 571?

Area code 571 is an overlay area code serving Northern Virginia, including the cities of Alexandria, Arlington, Fairfax, Falls Church, and Manassas. It was introduced in 2000 as an overlay to area code 703 to alleviate the exhaustion of available phone numbers in that area due to population growth. This means that both 571 and 703 area codes serve the same geographic region. You can find 571 numbers in both residential and business settings throughout Northern Virginia.