670 Area Code — Northern Mariana Islands
670 is a North American Numbering Plan area code for Northern Mariana Islands, the United States. It covers about 0 people in 3 towns and 3 ZIP codes, including Saipan, Rota and Tinian.
| Field | Value |
|---|---|
| Area code | 670 |
| Country | United States (+1) |
| State / province | Northern Mariana Islands |
| Type | Standalone (no other NANP code covers the same towns) |
| Time zone | Chamorro |
| Population covered | 0 |
| Towns covered | 3 |
| ZIP codes | 3 |
| Approx. centre | 14.783, 145.529 |
Where area code 670 is used
Area code 670 is assigned to Northern Mariana Islands, the United States, inside the North American Numbering Plan. Numbers in the code are written (670) NXX-XXXX at home and +1 670 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 670
The 3 towns below are the largest in the 670 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 |
|---|---|---|---|
| Saipan | Saipan Municipality | — | 1 |
| Rota | Rota Municipality | — | 1 |
| Tinian | Tinian Municipality | — | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| Saipan Municipality | 1 |
| Rota Municipality | 1 |
| Tinian Municipality | 1 |
Nearby area codes
How to dial area code 670
- Within North America: 670 + 7-digit number (670-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 670, then the 7-digit number — for example 00 1 670 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 670?
670 is a North American Numbering Plan area code assigned to Northern Mariana Islands, the United States. It covers about 0 people in 3 towns.
Is 670 a US or Canadian area code?
670 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 670 in?
Area code 670 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.