Northern Mariana Islands

Area code 670 is the sole area code for the Commonwealth of the Northern Mariana Islands (CNMI). It reuses the territory's former ITU country code, adopted when the CNMI joined the NANP in 1997.

The essentials Numbering data · NumberResearch · as of 2026-09-18

Place

Type

geographic

Status

in service

In service since

1997

Projected exhaust

2110 Q1

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 670 is

The entire Commonwealth of the Northern Mariana Islands (Saipan, Tinian, Rota and other islands)..

Communities served wholly or partly by 670:

SaipanTinianRota

Saipan holds most of the population.

B · Relationships

How it relates to other codes

The codes 670 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

What's changing. No overlay. Single territory-wide code. (The old ITU country code 670 was later reassigned to East Timor.)

C · History

How 670 got here

1997-07-01

Became effective as the CNMI joined the NANP, replacing its former international country code.

Source: Wikipedia

D · Capacity

How full it is

Prefixes assigned

Prefixes available

749

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 670 with another code →

Sources

Wikipedia ↗

Area code 670

NumberResearch.org ↗

Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.