U.S. Territories region · Chamorro Time
Northern Mariana Islands Area Codes
All 1 area code serving Northern Mariana Islands, the cities each one covers, and which are overlays. Northern Mariana Islands is served by 1 area code in the Chamorro Time zone.
Last updated October 1, 2026
Full list
Every Northern Mariana Islands area code
Northern Mariana Islands is served by 1 area code in the Chamorro Time zone. It is a single-code state, so seven-digit local dialing may still work in many places.
| Code | Area served | Type | In service |
|---|---|---|---|
| 670 | All of the Northern Mariana Islands, including Saipan, Tinian and Rota | Geographic | Since 1997 |
Area codes and dialing in Northern Mariana Islands
Northern Mariana Islands is one of the few US states still covered by a single area code, 670. Because there's no overlap, many local calls can still be completed with seven digits, although dialing the full 10-digit number always works and is the safer habit. 670 serves Saipan and the rest of the state, all in the Chamorro Time zone.
If Northern Mariana Islands ever exhausts its supply of numbers, regulators would almost certainly add an overlay rather than split the state — the modern approach that lets everyone keep their existing number. For now, every Northern Mariana Islands number shares the 670 code. Learn the background in how area codes work.
Browse Northern Mariana Islands another way
Explore by U.S. Territories region, by time zone, or jump to the city index. You can also see the complete numeric list of every US area code.
Quick answers
Northern Mariana Islands area code FAQ
How many area codes does Northern Mariana Islands have?
Northern Mariana Islands currently has 1 area code: 670.
What is the main area code for Northern Mariana Islands?
The busiest metro in Northern Mariana Islands is served by the 670 code. Major cities include Saipan.
Does Northern Mariana Islands require 10-digit dialing?
Much of the state still permits 7-digit local calls, though 10-digit dialing always works. Ten-digit dialing is the national standard.