Area code 670 covers Saipan and surrounding areas in Northern Mariana Islands. It was activated in 1997 as an overlay of area code 671.
| State | Northern Mariana Islands |
|---|---|
| Primary city | Saipan |
| Cities also served | Saipan, Garapan, Tinian, Rota, Capitol Hill, Susupe, Kagman |
| Time zone | Chamorro Standard Time (UTC+10 (no DST observed)) |
| Year established | July 1, 1997 |
| Original 1947 NPA? | No |
| Parent code | 671 |
| Overlay codes | None |
| Currently in use? | Yes, actively assigned |
| Ten-digit dialing required? | Yes |
Cities Served by Area Code 670
Area code 670 serves Commonwealth of the Northern Mariana Islands (CNMI) — all inhabited islands including Saipan, Tinian, and Rota, including the following cities and communities:
- Saipan
- Garapan
- Tinian
- Rota
- Capitol Hill
- Susupe
- Kagman
Nearby area codes covering the same broader region include: 671, 684.
How to Get a 670 Phone Number
There are three ways to get a phone number with the 670 area code, each suited to a different need:
- Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 670 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Contact us about a 670 number.
- Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 670 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
- Port an existing 670 number. If you already have a 670 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of Northern Mariana Islands sometimes can’t accept inbound ports of 670 numbers due to 911 routing rules.
212areacode.com specializes in Manhattan 212 numbers and select premium area codes. We don’t currently maintain a 670 inventory, but we may be able to source a 670 number through our carrier relationships. Contact us with your requirements and we’ll let you know what’s available.
Ready to Get a 212 Number?
One-time fee. No monthly charges. Port to any carrier in 3–5 business days. NYC's most trusted source since 2009.
Browse 212 Numbers →Frequently Asked Questions
Is the 670 area code still in use?
Yes. 670 is actively assigned to new phone lines in Commonwealth of the Northern Mariana Islands (CNMI) — all inhabited islands including Saipan, Tinian, and Rota.
What is the parent area code of 670?
Area code 670 is an overlay of 671. Both codes serve the same region of Northern Mariana Islands.
Can I get a 670 number if I don't live in Northern Mariana Islands?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 670 number from anywhere in the world. The number routes to whatever device or carrier you specify.
Is 670 a scam area code?
No. 670 is a legitimate, active area code for Commonwealth of the Northern Mariana Islands (CNMI) — all inhabited islands including Saipan, Tinian, and Rota. Like any area code, scammers occasionally spoof 670 caller IDs, but the code itself is heavily used by real Northern Mariana Islands businesses, government offices, and residents.
What territory does area code 670 serve?
Area code 670 is the sole NANP area code for the U.S. Commonwealth of the Northern Mariana Islands (CNMI), covering all inhabited islands including Saipan, Tinian, and Rota.
When did area code 670 go into service?
Area code 670 became effective on July 1, 1997, when the CNMI joined the North American Numbering Plan. A permissive dialing period ran through July 1, 1998, after which the old ITU country code +670 was retired and later reassigned to East Timor.
What time zone is area code 670 in?
Area code 670 operates on Chamorro Standard Time (ChST), which is UTC+10. The Northern Mariana Islands do not observe Daylight Saving Time, so the offset is fixed year-round.
Does area code 670 have an overlay or require ten-digit dialing?
Area code 670 has no overlay; it is the only area code for the CNMI. Local calls within the islands are dialed using only the seven-digit number, without the area code prefix.
