Guam area codes

1 active codes · NANPA NPA database, current as of July 28, 2026.

One area code — 671 — covers all of Guam. Most recent addition: 671, in service since 1997.

Coverage runs through 671 (Agana); prefix counts in the table approximate each code's numbering footprint.

Every Guam code keeps Chamorro time.

Guam dials like any US state: it joined the North American Numbering Plan when 671 entered service in 1997, replacing the old international dialing route. Calls between the mainland and Guam are domestic long-distance, not international.

671, in service since 1997, anchors Agana, carries 95 active prefixes across 1 rate centers, split among 8 carriers. It is the only area code serving Guam. Local dialing is ten digits.

Toll-free callers are a separate story: 800-family numbers carry no Guam geography at all, so an 833 or 877 number is never "from" the state — it belongs to whichever business rents it, anywhere in the NANP.

A number in any of these codes was issued in Guam, but portability means its owner may be anywhere today — the codes locate numbers, not people. To dig further, open a code's prefix or cities pages.

FAQ

How many area codes does Guam have?

1 geographic area code is currently in service: 671.

Which time zone are Guam numbers in?

All Guam area codes are in the Chamorro time zone.