670 area code
Where the 670 area code is, its overlay and how to dial a +1 670 number from anywhere.
The 670 area code is in Northern Mariana Islands, United States ((UTC+10)). To call from abroad: +1 670 555-0123.
The 670 area code is a geographic North American Numbering Plan (NANP) code covering Northern Mariana Islands. It has been in service since 04-Sep-1996 and sits in the (UTC+10) time zone.
How to dial a 670 number
+1 670 555-01231 670 555-0123Frequently asked questions
Where is the 670 area code?
The 670 area code is in Northern Mariana Islands, United States ((UTC+10)).
Do I have to dial 10 digits for 670?
Local calls within 670 may use seven digits; ten-digit dialling always works.
How do I call a 670 number from another country?
Dial your exit code (or +), then 1, then 670, then the number: +1 670 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 670 number does not pinpoint a street or ZIP code.
Number holders in area code 670
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 51 prefixes are in use in 670, shared by 5 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| Micronesian Telecommunications Corporation | 15 | 29% |
| Pti Pacifica Inc. | 15 | 29% |
| Multiple Ocn Listing | 9 | 18% |
| 7 | 14% | |
| Guam Wireless Telephone Company, LLC | 5 | 10% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
All US area codes United States +1 Map of area code 670 — cities & rate centres