Northern Mariana Islands area codes

1 active codes · NANPA NPA database, current as of July 28, 2026.

The table below lists every active Northern Mariana Islands area code with its coverage, service date and prefix count.

Geographically the map reads: 670 (Saipan). Each code page lists its full coverage down to individual rate centers.

Time zone is uniform across the state's codes: Chamorro.

A statewide single code is getting rare in the NANP — most states have long since added overlays. 670 still covers everything from Saipan to Rota on one code.

As a NANP territory, Northern Mariana Islands has used standard ten-digit US numbering since 1997 (670); no country code beyond +1 is needed to call it.

670, in service since 1997, anchors Saipan, carries 35 active prefixes across 3 rate centers, split among 3 carriers. It is the only area code serving Northern Mariana Islands. Local calls can still be dialed with seven digits — increasingly rare in the NANP.

Note that toll-free codes (800, 833, 844, 855, 866, 877, 888) sit outside this list — they have no geographic tie to Northern Mariana Islands or anywhere else, and are assigned individually from the national SMS/800 registry.

As everywhere in the NANP: these codes say where numbers were issued, not where callers are. Per-code pages break coverage down to rate centers and prefixes.

FAQ

How many area codes does Northern Mariana Islands have?

1 geographic area code is currently in service: 670.

Which time zone are Northern Mariana Islands numbers in?

All Northern Mariana Islands area codes are in the Chamorro time zone.