U.S. Territories region · Chamorro Time
Guam Area Codes
All 1 area code serving Guam, the cities each one covers, and which are overlays. Guam is served by 1 area code in the Chamorro Time zone.
Last updated October 1, 2026
Full list
Every Guam area code
Guam is served by 1 area code in the Chamorro Time zone. It is a single-code state, so seven-digit local dialing may still work in many places.
| Code | Area served | Type | In service |
|---|---|---|---|
| 671 | The entire U.S. territory of Guam | Geographic | Since 1997 |
Area codes and dialing in Guam
Guam is one of the few US states still covered by a single area code, 671. Because there's no overlap, many local calls can still be completed with seven digits, although dialing the full 10-digit number always works and is the safer habit. 671 serves Hagåtña and the rest of the state, all in the Chamorro Time zone.
If Guam ever exhausts its supply of numbers, regulators would almost certainly add an overlay rather than split the state — the modern approach that lets everyone keep their existing number. For now, every Guam number shares the 671 code. Learn the background in how area codes work.
Browse Guam another way
Explore by U.S. Territories region, by time zone, or jump to the city index. You can also see the complete numeric list of every US area code.
Quick answers
Guam area code FAQ
How many area codes does Guam have?
Guam currently has 1 area code: 671.
What is the main area code for Guam?
The busiest metro in Guam is served by the 671 code. Major cities include Hagåtña.
Does Guam require 10-digit dialing?
Much of the state still permits 7-digit local calls, though 10-digit dialing always works. Ten-digit dialing is the national standard.