670 area code: location, time zone and numbers
Northern Mariana Islands uses 670, a US telephone area code that has served the territory since 1997.
- Location
- Every part of Northern Mariana Islands
- Service began
- 1997
- Local time zone
- Chamorro (UTC+10)
- Overlay
- No overlay: it is the only code for its area
- Calls within the area
- Dialling with 7 digits
- Projected exhaustion
- More than 100 years into the future
- Country calling prefix
- +1 (United States)
Source: NANPA public reports, the area code report and the rate-centre report, file dated 11/01/2026; the exhaust year comes from NANPA projections 2026-1 (April 2026). We are not an official NANPA site.
Get a number with the 670 code
A 670 number comes from two different routes. With its plan, a provider assigns a new number, chosen at sign-up from the numbers it has in the code. Sellers post numbers they already hold, often with a pattern, and charge a one-time price. You then move the selected number to a provider.
Providers ranked by first-year cost
| Provider | Cheapest plan | First year | Link |
|---|---|---|---|
 Free app | Basic (Just for me), free | $0 | Open Google Voice |
 Free app | Free plan, free | $0 | Open TextNow |
 Developer API | Pay-as-you-go local number, $1.15 a month | $13.80 | Open Twilio |
 Second-number app | Standard, $3.99 a month billed yearly | $47.99 | Open Burner |
 Toll-free specialist | Solo, $6.99 a month billed yearly | $84 | Open UniTel Voice |
 Second-number app | Deluxe (local number), $6.99 a month billed yearly | $102.88 | Open GoDaddy Conversations (formerly Smartline) |
Sellers that list local numbers
| Seller | What it sells | Listed price | Monthly fee | Link |
|---|---|---|---|---|
 Marketplace | Local numbers | From $9 one-time | None stated | Search at Exclusive Digits |
 Marketplace | Local and toll-free | From $9.95 one-time | $2.99 a month | Search at NumberBarn |
 Number broker | Local and toll-free | From $99 one-time | None stated | Search at RingBoost |
 Number broker | Local and toll-free | From $100 one-time | None stated | Search at PhoneNumberExpert |
| 212areacode.comNumber broker | Local numbers | From $150 one-time | None stated | Search at 212areacode.com |
Some sellers and providers may pay us a referral fee. It never changes the order, and the order follows first-year cost. How we earn
670 area code questions
What area does 670 cover?
Calls to 670 ring in Northern Mariana Islands.
Which country code does a 670 number use?
+1. The North American Numbering Plan covers 670, so calling from outside the country means +1 670 plus the 7-digit number.
What time is it in the 670 area code?
The time zone for 670 is Chamorro (UTC+10).
Who calls using a 670 number?
The code covers homes, mobiles and local businesses, along with callers who fake a local number. When a 670 number shows on your screen, it tells you where it was assigned, not who is calling.