670 Area Code
Northern Mariana Islands · Saipan
The 670 area code serves Northern Mariana Islands. It is part of the North American Numbering Plan, and Northern Mariana Islands is a US territory — calls to and from the mainland dial +1 and stay domestic, with no international rates.
About Northern Mariana Islands
- Country
- 🇲🇵Northern Mariana Islands (MP)
- Capital
- Saipan
- Population
- 47,329 (2020)
- Area
- 464 km²
- Currency
- US dollar (USD)
- Languages
- English, Chamorro, Carolinian
- Timezone
- Pacific/Saipan (UTC+10, no DST)
- Internet TLD
- .mp
- Drives on
- Right
History
Creation: 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.
Mnemonics: Area codes containing 0 or 1 cannot form mnemonics, because those digits have no letters on a standard telephone keypad.
Sources: en.wikipedia.org/wiki/Area_code_670, www.census.gov/newsroom/press-releases/2021/2020-census-cnmi.html.
How to call Northern Mariana Islands
No 011 prefix needed — Northern Mariana Islands is part of the NANP, so calls dial like a domestic North American number. Long-distance and roaming charges still apply.
Use your country's international access code (00 in most of Europe, 0011 in Australia), then 1, the 670 area code, and the local number.
Domestic calls use seven digits — no area code prefix needed.
Major cities in Northern Mariana Islands
Settlements served by the 670 area code, ranked by population. Smaller territories may have a single major settlement plus surrounding villages.
| City | Population | % of country |
|---|---|---|
| Saipan | 43,385 | 91.7% |
| Listed total | 43,385 | 91.7% |
Telecom operators
Numbers in the 670 area code are assigned by Northern Mariana Islands's telecom regulator to the following landline and mobile operators.
- Docomo Pacific
- IT&E
Frequently Asked Questions
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.