670 Area Code: Northern Mariana Islands (all)
Updated: November 2026. Area code data: NANPA assignments via Simple Wikipedia and areacode.fyi, checked November 2026.
It covers Northern Mariana Islands.
| Area code | 670 |
|---|---|
| Location | Northern Mariana Islands (all) |
| Time zone | Chamorro Time |
| Type | Geographic |
| Region | Northern Mariana Islands |
Where is 670?
Northern Mariana Islands (all).
Time zone
Area code 670 is in the Chamorro Time zone. The best time to call is generally between 9 a.m. and 8 p.m. local time. Use our best time to call tool to compare it with your own time.
History
The North American Numbering Plan was created in 1947 to organise telephone numbers across the United States, Canada and neighbouring regions. When an area runs out of phone numbers, the North American Numbering Plan Administrator (NANPA) either splits the area or adds an overlay code that covers the same area; overlays are now the usual approach, which is why 10-digit dialing is standard in most places. Area code 670 serves Northern Mariana Islands.
How to dial 670
From the United States or Canada, dial 1 + 670 + the 7-digit number. From abroad, dial your international prefix, then 1 + 670 + the number — for example, +1 670 555 0132.
Is a call from 670 a scam?
Scammers can fake any area code, including 670. A number that looks local is not proof of who is calling. Never share passwords, verification codes or payment details with an unexpected caller; hang up and call the company back on a number from its official website. Report scam calls at reportfraud.ftc.gov, and forward spam texts to 7726.
Report scam calls at reportfraud.ftc.gov, forward spam texts to 7726, and register on the National Do Not Call Registry at donotcall.gov.
Nearby area codes
FAQs
What city is area code 670?
Northern Mariana Islands (all).
What time zone is area code 670?
Chamorro Time.
Is 670 a toll-free area code?
No. 670 is a regular geographic area code, so calls to it are charged at your normal rate.
How do I call a 670 number from abroad?
Dial your international prefix, then 1 + 670 + the 7-digit number — for example, +1 670 555 0132.
Should I call back an unknown 670 number?
Only if you are expecting the call. If you do not recognise the number, look the company up independently instead of calling back — scammers often hope a callback will connect you to a premium-rate or phishing line.
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