671 Area Code
Guam · Hagåtña
The 671 area code serves Guam. It is part of the North American Numbering Plan, and Guam is a US territory — calls to and from the mainland dial +1 and stay domestic, with no international rates.
About Guam
- Country
- 🇬🇺Guam (GU)
- Capital
- Hagåtña
- Population
- 153,836 (2020)
- Area
- 549 km²
- Currency
- US dollar (USD)
- Languages
- English, Chamorro
- Timezone
- Pacific/Guam (UTC+10, no DST)
- Internet TLD
- .gu
- Drives on
- Right
History
Creation: Guam joined the North American Numbering Plan on July 1, 1997, taking area code 671 — the same digits as its previous ITU country code, +671. Before the change, a call from the US mainland was dialed as an international call (011 671); joining the plan made it a domestic +1 call.
Mnemonics: Area codes containing 0 or 1 cannot form mnemonics, because those digits have no letters on a standard telephone keypad.
Sources: en.wikipedia.org/wiki/Area_code_671, bsp.guam.gov/census-bureau-releases-guams-2020-housing-unit-and-population-counts.
How to call Guam
No 011 prefix needed — Guam is part of the NANP, so calls dial like a domestic North American number. Long-distance and roaming charges still apply.
Use your country's international access code (00 in most of Europe, 0011 in Australia), then 1, the 671 area code, and the local number.
Domestic calls use seven digits — no area code prefix needed.
Major cities in Guam
Settlements served by the 671 area code, ranked by population. Smaller territories may have a single major settlement plus surrounding villages.
| City | Population | % of country |
|---|---|---|
| Dededo | 44,943 | 29.2% |
| Yigo | 19,339 | 12.6% |
| Tamuning | 18,489 | 12.0% |
| Listed total | 82,771 | 53.8% |
Telecom operators
Numbers in the 671 area code are assigned by Guam's telecom regulator to the following landline and mobile operators.
- GTA
- Docomo Pacific
- IT&E
Frequently Asked Questions
671 is the area code for Guam, a US territory. It is part of the North American Numbering Plan (NANP), sharing the +1 prefix with the rest of the US and Canada — and unlike the Caribbean nations in the plan, it is US soil, so calls to and from the mainland are domestic.