# Area code 670 — Northern Mariana Islands

> Area code 670 serves Northern Mariana Islands 🇲🇵, a US territory inside the North American Numbering Plan — American soil outside the 50 states, DC and Puerto Rico. A call from the mainland US dials +1 and stays domestic: normal long-distance or mobile charges apply, not international rates. Capital Saipan; population 47,329 (2020). It is currently the only area code in service for Northern Mariana Islands. In service since July 1, 1997.

- Page: https://getareacode.com/670/
- This document: https://getareacode.com/670.md
- Site index for agents: https://getareacode.com/llms.txt
- Data last updated: August 2026

## Key facts

| Field | Value |
| --- | --- |
| Area code | 670 |
| Kind | US territory — inside the NANP and inside the US, outside the 50 states and DC |
| Territory | Northern Mariana Islands 🇲🇵 |
| ISO 3166-1 alpha-2 | MP |
| Capital | Saipan |
| Population | 47,329 (2020) |
| Area | 464 km² |
| Currency | US dollar (USD) |
| Languages | English, Chamorro, Carolinian |
| Time zone | Pacific/Saipan (UTC+10, no DST) |
| Dialed from the US or Canada | 1 + 670 + 7-digit local number |
| Dialed from outside the NANP | your exit code, then 1 670 and the local number |
| Internet TLD | .mp |
| Driving side | right |
| In service since | July 1, 1997 |
| Overlay complex | None |

## History of area code 670

The Northern Mariana Islands joined the North American Numbering Plan on July 1, 1997, taking area code 670 — the same digits as the territory's previous ITU country code, +670. Before the change, a call from the US mainland was dialed as an international call (011 670); joining the plan made it a domestic +1 call.

## Major cities in Northern Mariana Islands

| City | Population |
| --- | --- |
| Saipan | 43,385 |

## Telecom operators in Northern Mariana Islands

- Docomo Pacific
- IT&E

## How to dial a 670 number

- From the mainland US or Canada: 1 + 670 + 7-digit local number. The call is domestic — no international prefix and no international rates; normal long-distance or mobile charges apply.
- From outside the NANP: your country's exit code, then 1 670 and the local number, or +1 670 from a mobile.
- Inside Northern Mariana Islands: the local number, per the local dialing plan.
- 670 is a US area code, but caller ID is trivially spoofed — the code alone still does not verify who is calling.

## Frequently asked questions about area code 670

### Where is area code 670?

670 is the area code for Northern Mariana Islands, a US territory. It is part of the North American Numbering Plan (NANP), sharing the +1 prefix with the rest of the US and Canada — and unlike the Caribbean nations in the plan, it is US soil, so calls to and from the mainland are domestic.

### How do I call Northern Mariana Islands from the US or Canada?

Dial 1 + 670 + 7-digit local number. The call is domestic — no international prefix and no international rates — though some mobile plans price the island territories separately, so check yours before a long call.

### Is area code 670 a scam?

Not by itself. 670 is a legitimate US area code serving Northern Mariana Islands. Caller ID is trivially spoofed, though, so an unexpected call from 670 deserves the same caution as any unknown number — verify the caller before returning the call.

### Does 670 have an overlay?

No. 670 is currently the only area code in service for Northern Mariana Islands.

### What is the timezone of area code 670?

Northern Mariana Islands observes Pacific/Saipan (UTC+10, no DST) and does not change clocks for daylight saving time, so the offset from the mainland shifts by an hour when the mainland does.

### When did area code 670 go into service?

Area code 670 went into service on July 1, 1997.

### What is the population of Northern Mariana Islands?

Northern Mariana Islands has a population of approximately 47,329 (2020). The capital is Saipan, and the territory covers 464 km².

## Sources

- https://en.wikipedia.org/wiki/Area_code_670
- https://www.census.gov/newsroom/press-releases/2021/2020-census-cnmi.html
- Method in full: https://getareacode.com/methodology/
- Licence: the aggregated data on this site is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) — attribution required.