571 Area Code: Arlington, Virginia

Northern Virginia's 571 area code is an overlay sharing geography with the long-running 703 across Arlington, Fairfax, and the surrounding Washington-area suburbs. Arlington anchors the directory's records here. The county sits across the Potomac from Washington, organized around the Pentagon, Arlington National Cemetery, and a substantial concentration of federal employment, contractors, and the corporate headquarters that have grown up around them. The 571 designation, part of the North American Numbering Plan, has been filling with allocations as the broader 703 region's number demand has continued to grow.

In records the directory has compiled for 571 numbers, other Virginia cities — Bristol, Lynchburg, Richmond, and Roanoke — appear regularly. None of those are inside the 571 footprint. The pattern reflects standard public-record dynamics across Virginia. The directory currently documents 367 distinct prefixes within 571 in detail, a working subset of the prefix population the code carries.

Arlington's median household income is the most striking demographic feature: at well above the US figure, the county carries one of the higher city-level income readings in the country, supported by the broader Washington-area concentration of federal, corporate, and professional services employment. Home values come in close to three times the US median, the median age sits close to the US reading, and population places Arlington among the larger Virginia jurisdictions. The 571 footprint shares those demographics with 703 because both codes serve northern Virginia in overlapping form.