Area code 670 – Northern Mariana Islands
670 has served Northern Mariana Islands since 1997. It is still largely empty: 35 of 786 number blocks allocated. Other CLEC / VoIP holds 100.0% of those blocks, which is unusually concentrated for a US area code.
- State
- Northern Mariana Islands
- In service since
- 1997
- Time zone
- Chamorro
- Shares area with
- No overlay
Who holds 670 number blocks
Share of the 35 assigned NXX blocks (4.5% of the 786 possible), across 3 carriers. This is share of number blocks, not of subscribers.
- Other CLEC / VoIP100%
Rate centers in 670
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names.
Timeline
- 1997 670 goes into service in Northern Mariana Islands.
More about 670
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 670
What state is area code 670?
Northern Mariana Islands.
Which carrier owns 670 numbers?
Other CLEC / VoIP holds the largest share of assigned number blocks at 100.0%. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 670?
No. NANPA records 670 as 7-digit dialing for local calls.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “7D”. Reviewed by the data desk. Spotted an error? Request a correction.