Guam is served by a single area code as of 2026. This guide walks through which code it is, when it was assigned, how it has held up against population growth, and what the prospects look like for additional codes in the future.
The Short Answer
Guam currently has one active area code in service. The code has held its territory without needing relief since it was assigned, which reflects Guam’s population size and the rate at which new phone lines are being activated in the state.
Guam has roughly 168,399 residents as of the most recent estimates. That population, combined with the spread of mobile and VoIP lines per household, determines how often new area codes are needed.
The Guam Area Code
The active area codes serving Guam are listed below, in numerical order. Where a code is an overlay or a split-off from an earlier code, that relationship is noted.
- 671 — All of Guam (Hagu00e5tu00f1a, Dededo, Tamuning, and every village territory-wide)
How Guam’s Area Codes Grew Over Time
Guam received its first area code after the original 1947 NANP launch. The full sequence of code activations and splits is laid out below.
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Browse Guam Area Codes →- 1997 — 671 was added to the North American Numbering Plan on July 1, 1997, the 205th area code placed in service. Before then, Guam used International Telecommunication Union country code 671 and callers from the U.S. mainland had to dial 011-671 plus the local number, as for an international call.
- 1998 — Permissive dialing ended on July 1, 1998, completing Guam's transition into the NANP. Calls between Guam and other NANP locations were thereafter treated as domestic, dialed as 1-671 plus the seven-digit number, which sharply lowered long-distance costs and opened toll-free numbers to callers on Guam.
What’s Next for Guam Area Codes
Guam is served by a single area code, 671, and has been since it joined the North American Numbering Plan in 1997. With a population under 200,000 and no overlay or split ever assigned, 671 has ample numbering capacity. NANPA’s NPA exhaust projections do not list 671 on any near-term relief schedule, and a second Guam area code is not anticipated in the foreseeable future.
Frequently Asked Questions
How many area codes does Guam have?
Guam has one area code, 671, which covers the entire territory. It has never been split or overlaid, so every Guam phone number uses 671.
What is the oldest area code in Guam?
671 is the oldest active area code in Guam, assigned in 1997. It remains in service today.
What is the newest area code in Guam?
The most recent area code addition to Guam was 671, activated in 1998. New phone lines provisioned in its service area are increasingly drawn from this code as older overlays approach exhaustion.
Is 671 a real area code?
Yes. 671 is the area code for Guam, added to the North American Numbering Plan on July 1, 1997. Before that date, Guam was reached using the international dialing prefix 011 followed by 671.
How do I call Guam from the U.S. mainland?
Because Guam is part of the North American Numbering Plan, you dial 1-671 followed by the seven-digit local number, the same way you would dial any U.S. state. Most carriers treat these as domestic long-distance calls rather than international ones, though some mobile plans bill calls to Guam differently.
Why was Guam added to the North American Numbering Plan?
Falling long-distance rates in the 1990s made the old 011-671 international dialing expensive for families and the many U.S. military personnel stationed on Guam. Joining the NANP in 1997 let the FCC regulate calls to and from Guam as domestic, cutting costs and giving the territory access to U.S. toll-free numbers.
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We carry available Guam numbers right now. Order a 671 number directly — a one-time fee, no monthly charges, with pricing From $150 depending on the digit pattern and memorability of the number. Prefer help choosing? Call us at (212) 580-2000.
