703 Area Code: Northern Virginia Since 1947

The 703 area code serves inner Northern Virginia — Arlington, Fairfax, and Prince William counties and most of Loudoun, with Alexandria, Falls Church, Herndon, Leesburg, and Manassas — and has shared that territory with the 571 overlay since March 1, 2000. NANPA’s database dates the code to January 1, 1947, and for its first twenty-six years those three digits reached every telephone in Virginia.

A 703 number popping up unexpectedly signals Northern Virginia — the region’s oldest caller-ID marker, dating to 1947 — but the display is the easiest part of a call to fake, so those three digits vouch for no one.

703 at a glance

Quick fact	Answer
In service since	January 1, 1947
Split from	Original 1947 code — once all of Virginia
Overlay	571, in effect since March 1, 2000
Territory anchors	Arlington, Alexandria, Herndon, Leesburg, Manassas
Dialing	Ten digits on every local call since March 1, 2000
Exhaust projection	Q1 2031 for the combined 571/703 inventory, per NANPA’s April 2026 study

The contraction from a whole state to a handful of counties pressed against the Potomac is the story of Northern Virginia itself. Each time the code shrank, the region it kept had outgrown everything it gave away.

One code for the whole Commonwealth

Virginia entered the numbering plan with a single assignment. NANPA’s records list no second Virginia code until 804 went into service on June 24, 1973, splitting Richmond and the east away and ending 703’s twenty-six-year statewide run. Across the river, Washington itself has carried 202 since the same January 1947 start date — the District and its Virginia suburbs have never shared an area code.

The second cut came a generation later. NANPA assigned 540 on August 9, 1994, and the new code entered service on July 15, 1995, taking the rest of 703’s territory west and south of the metro — the Fredericksburg corridor included, per the relief map NANPA later attached to its overlay letter. What stayed behind was compact and dense: the inner counties and the independent cities among them, where number demand was about to explode.

Ten digits before most of America

Four years after the 540 split, the trimmed-down code was already running short. PL-NANP-177 — dated June 1, 1999, and the only planning letter NANPA’s database lists against 703 — opens bluntly: “as a result of substantial number growth in Northern Virginia, the 703 NPA is nearing exhaust.” The Virginia State Corporation Commission had approved the remedy in 1998, and it picked a tool no Virginian had seen before: an overlay, the first in the state.

The mechanics moved fast. NANPA assigned 571 on June 1, 1999 — the same day the letter went out — and permissive ten-digit dialing began immediately. Carriers connecting to Bell Atlantic’s network had until August 31, 1999 to convert their trunk translations, a test number at 571-594-TEST (571-594-8378) began answering on February 1, 2000, and the overlay took effect March 1, 2000. From that morning on, every local call in Northern Virginia has used all ten digits.

That early switch spared the region the biggest dialing change of the last decade. When the 988 crisis line pushed 82 seven-digit area codes onto ten-digit dialing, NANPA’s PL-556 (January 8, 2021) carried exactly two Virginia entries — 276 and 804. Northern Virginia had nothing to convert; it had been dialing this way for two decades.

The experiment also stayed a local one for a remarkably long time. NANPA’s database shows no second Virginia overlay in service until 948 arrived over 757 in May 2022, with 826 following atop 540 in June and 686 atop 804 in early 2024. The rest of the state took twenty-two years to join the arrangement Northern Virginia started.

A 7.2-year forecast, twenty-six years in

PL-177 closed its case for relief with a prediction: “The overlay of 703 with 571 is forecasted to exhaust in 7.2 years.” That math pointed at roughly 2007. The pair is still assigning numbers in 2026, and NANPA’s April 2026 exhaust study now sets the combined prefix inventory’s horizon at the first quarter of 2031 — two quarters later than the forecast before it, on reduced demand. If the date holds, an overlay given seven years will have run thirty-one.

The recent record is unusually steady for an exhaust forecast: every NANPA projection since late 2023 has landed the pair between 2029 and 2031, and the July 6, 2026 revision cycle amounted to four Texas adjustments, with Virginia absent. The database keeps 571/703 off both the jeopardy and relief-planning lists.

Still, the runway is the shortest in the state — eleven years nearer than 434, Virginia’s next code in line — so the Commonwealth’s next relief conversation starts here. Its shape is not hard to guess: the State Corporation Commission resolved its three most recent exhaust cases, in 757, 540, and 804, with all-services overlays, and a third code layered onto Northern Virginia would change no existing number in a region that already dials ten digits.

What a 703 display proves — and what it doesn’t

Lead lists in the Washington metro split three ways — the District’s 202, Maryland’s suburban codes, and the Virginia side’s 703/571 — and which one shows on the screen is the first thing a prospect reads. Showing the prospect’s side of the river on the display is the heart of local presence dialing; a 703 in particular has read as Northern Virginia since 1947, the oldest signal in the region.

The display is also the easiest thing on a call to fake. Caller ID spoofing will print any ten digits on any call, which is why terminating networks increasingly trust the cryptographic signature behind a call rather than the code in front of it.

That is where the carrier matters. SIPNEX holds a direct FCC authorization rather than reselling one, and sources local DID numbers down to the specific rate center across US markets, Northern Virginia included as stock permits. The trunk side is SIP trunking into whichever PBX or dialer you run, toll-free service comes through SIPNEX’s own RespOrg registration, and outbound calls are signed at the A level under a STIR/SHAKEN certificate issued in SIPNEX’s name — the half of local credibility a borrowed display cannot supply.

What to know about the 703 area code

Which cities and counties use the 703 area code?

Arlington, Fairfax, and Prince William counties plus most of Loudoun, with the cities and towns inside that footprint — Alexandria, Falls Church, Herndon, Leesburg, and Manassas — down to the Quantico Marine Reservation at the southern edge, per the boundary map filed with planning letter PL-177. Western Loudoun towns such as Purcellville and Middleburg fall on the 540 side of that boundary. The whole territory sits in Eastern Time, and every address in it can also hold a 571 number.

Are 703 and 571 numbers the same thing?

Functionally, yes. 571 is an all-services overlay that has covered 703’s exact footprint since March 1, 2000, so both codes reach the same rate centers and cost the same to call. No 703 number changed when the overlay launched — new assignments simply draw from two pools instead of one. The 571 area code guide tells the younger code’s side of the story.

When did the 703 area code switch to ten-digit dialing?

Permissive ten-digit dialing began June 1, 1999, and it became mandatory on March 1, 2000, when the 571 overlay took effect — NANPA planning letter PL-177 also required carriers on Bell Atlantic’s network to convert trunk translations by August 31, 1999. That put Northern Virginia more than two decades ahead of the 988-driven conversions of 2021, whose only Virginia entries under PL-556 were 276 and 804.

How long will the 703 area code last?

NANPA’s April 2026 exhaust study gives the combined 571/703 inventory until the first quarter of 2031 — two quarters later than the prior forecast, on reduced demand — with the July 6, 2026 revisions leaving Virginia untouched. No jeopardy flag is set and no relief project is open. Exhaust would not retire the code either: Virginia’s recent relief cases have all ended in overlays, which add a code and change no existing 703 number.

Can I get a 703 area code number without a Virginia office?

Yes. A number lives in its rate center, not at a street address, and SIP delivery will ring a 703 DID wherever your team works. Availability shifts with inventory day to day — the 571/703 pool is the tightest in Virginia — so specific rate centers can vary. SIPNEX provisions local DID numbers and routes them into the phone system already on your desks.

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Seventy-nine years in, 703 is still the number Northern Virginia expects to see on an incoming call. SIPNEX provisions DIDs in the region’s rate centers, delivers them over SIP, and signs everything it originates — reach the team at (833) 665-2220, through the contact page, or start with current pricing.