North American Numbers Source-cited · ownership disclosed
Area code
571
In service
United States · since 2000

Northern Virginia (overlay)

Introduced in 2000 as an all-services overlay of 703, area code 571 serves the same Northern Virginia territory as its parent and was Virginia's first overlay.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Northern Virginia (overlay)
Type
geographic
Status
in service
In service since
2000
Projected exhaust
2031 Q1

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 571 is

Arlington and Fairfax counties plus parts of Fauquier, Loudoun, and Prince William counties in Northern Virginia..

Communities served wholly or partly by 571:

AlexandriaArlingtonFairfaxFalls ChurchManassasManassas Park

Coextensive with 703; the two codes serve the identical geography.

B · Relationships

How it relates to other codes

The codes 571 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2000 703 Northern Virginia 571 is the overlay added over the existing 703 territory; both serve identical geography.
What's changing. Overlay of 703 (same geography). 10-digit dialing mandatory.
C · History

How 571 got here

2000-03-01
Introduced as an overlay of 703, making 10-digit dialing mandatory across Northern Virginia.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
649
Prefixes available
151
Thousands-blocks assigned
5,648

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 571 with another code →
Sources
Wikipedia ↗
Area codes 703 and 571
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.