671 area code
Area code 671 is in Guam. It covers Agana Heights, Barrigada, Hagatna and 15 other places: 21 ZIP codes in Guam. Local time there is , Chamorro Time. In service since 1997, with no overlay.
- State
- Guam
- Time zone
- Chamorro
- Largest city
- Agana Heights
- Overlays
- none
- In service since
- 1997
- Rate centres
- 1
- Prefixes assigned
- 95 (950,000 numbers)
Who calls from a 671 number
NANPA records the carrier each block of 671 numbers is assigned to. Of the 950,000 671 numbers assigned, 56% are with local phone companies (Teleguam Holdings); 29% with cable, internet-calling, business and other carriers (PTI Pacifica, IT&E and Docomo Pacific); 15% with mobile carriers (Guam Wireless Telephone Company).
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| Teleguam Holdings | Landline | 56% |
| PTI Pacifica | Cable, VoIP, other | 20% |
| Guam Wireless Telephone Company | Mobile | 15% |
| IT&E | Cable, VoIP, other | 3% |
| Docomo Pacific | Cable, VoIP, other | 2% |
| Iconn | Cable, VoIP, other | 2% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 671
The 1 place with a telephone rate centre of its own using 671, largest first. Each links to its ZIP codes.
| Place | ZIP codes | Population |
|---|---|---|
| Agana Heights, GU | 1 | — |
Nearby places using 671
These places have no rate centre of their own in NANPA's records; the nearest one uses 671. Near an area-code boundary that can be wrong for part of a town.
- Barrigada
- Hagatna
- Tamuning
- Agat
- Asan
- Dededo
- Inarajan
- Mangilao
- Merizo
- Mongmong
- Piti
- Santa Rita
- Sinajana
- Talofofo
- Umatac
- Yigo
- Yona
ZIP codes in area code 671
21 ZIP codes in 18 towns, by the town each is mailed to, largest first. Each links to its own page.
Where 671 numbers are issued
NANPA's rate centres with the most 671 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
AGANA | Agana Heights | 95 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 671
Where is area code 671?
Area code 671 is in Guam. It covers Agana Heights, Barrigada, Hagatna and 15 other places: 21 ZIP codes in Guam.
What ZIP codes are in area code 671?
21 ZIP codes, by the town each is mailed to: Agana Heights (96919), Barrigada (2, 96913 to 96921), Hagatna (2, 96910 to 96932), Tamuning (2, 96911 to 96931) and 14 more towns. The full list is on this page.
What time zone is area code 671 in?
Chamorro time.
Is a 671 number a mobile or a landline?
It can be either. 15% of 671 numbers are assigned to mobile carriers and 56% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
Does a 671 number mean the caller is in Guam?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 671 call can come from anywhere.
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 671.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/671
Underlying data is public domain or openly licensed — sources, vintages and licences.