671 Area Code — Guam
671 is a North American Numbering Plan area code for Guam, the United States. It covers about 0 people in 18 towns and 21 ZIP codes, including Hagatna, Tamuning and Barrigada.
| Field | Value |
|---|---|
| Area code | 671 |
| Country | United States (+1) |
| State / province | Guam |
| Type | Standalone (no other NANP code covers the same towns) |
| Time zone | Chamorro |
| Population covered | 0 |
| Towns covered | 18 |
| ZIP codes | 21 |
| Approx. centre | 13.430, 144.772 |
Where area code 671 is used
Area code 671 is assigned to Guam, the United States, inside the North American Numbering Plan. Numbers in the code are written (671) NXX-XXXX at home and +1 671 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Towns and cities in area code 671
The 18 towns below are the largest in the 671 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Hagatna | Guam | — | 2 |
| Tamuning | — | 2 | |
| Barrigada | Guam | — | 2 |
| Dededo | — | 1 | |
| Yona | — | 1 | |
| Santa Rita | Guam | — | 1 |
| Merizo | Guam | — | 1 |
| Inarajan | Guam | — | 1 |
| Umatac | — | 1 | |
| Agana Heights | — | 1 | |
| Asan | — | 1 | |
| Mangilao | — | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| Guam | 7 |
Nearby area codes
How to dial area code 671
- Within North America: 671 + 7-digit number (671-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 671, then the 7-digit number — for example 00 1 671 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 671?
671 is a North American Numbering Plan area code assigned to Guam, the United States. It covers about 0 people in 18 towns.
Is 671 a US or Canadian area code?
671 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 671 in?
Area code 671 is in the Chamorro time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.