671 Area Code

Where is the 671 area code?

671 is a Guam area code covering the entire U.S. territory of Guam. In the wider directory it sits in the U.S. Territories region.

Cities in the 671 area code

• Hagåtña
• Dededo
• Yigo
• Tamuning
• Mangilao
• Barrigada
• Santa Rita
• Sinajana
• Yona
• Agana Heights
• Talofofo
• Inarajan

See 671 on the area code map →

Dialing 671

Hagåtña, GU is currently served by the single area code 671, with no overlay. Ten-digit dialing (area code + seven-digit number) always works and is increasingly the norm nationwide; some local calls may still connect with seven digits. If a future overlay is added, 10-digit dialing would become mandatory.

From outside the US, dial +1 671 followed by the seven-digit number.

History of the 671 area code

671 went into service on July 1, 1997. It serves Hagåtña and the surrounding part of Guam. For how codes are created, split, and overlaid, see how area codes work.

Is 671 a scam or spam risk?

671 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 671 number on your screen is no guarantee the caller is in Hagåtña, GU or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.

Explore more

See every code in Guam, compare codes across the U.S. Territories region, or view all Chamorro Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.

New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.