670 area code — Saipan, CNMI geographic

Data: NANPA public reports, current as of July 28, 2026.

Area code 670 is a geographic code serving Saipan, Northern Mariana Islands in the Chamorro time zone. It has been in service since July 1, 1997. Note that porting and VoIP mean a 670 number can be used from anywhere — the code marks where the number was assigned.

35 central-office prefixes are currently active in this code, spread across 3 code-holding carriers. Its prefixes map to 3 distinct rate centers.

Dialing: 7D locally.

Worth noting: 670 is the only area code serving Northern Mariana Islands.

Practical takeaway: the 670 label narrows geography to Northern Mariana Islands, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.

Largest localities in 670

FAQ

Why am I getting spam calls from 670 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 670 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 670 number from?

670 is assigned to Saipan and surrounding areas of Northern Mariana Islands in the Chamorro time zone. The three digits after the area code (the prefix) narrow it down to a rate center.

Is 670 a toll-free number?

No. 670 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.