Area Code 670
Area code 670 is in Northern Mariana , spanning 3 counties and serving 17 cities, including Saipan, Garapan or Kagman; it currently uses 35 prefixes, assigned from 670-233-XXXX through 670-989-XXXX.
In service date for area code 670: July 01, 1997.
The current local time is .
For exact NPA boundaries see official 670 area code map
Phone number lookup
Locate any 670-NXX prefix:
| NPANXX | Area Served1 | Date1 |
|---|---|---|
| 670-233 | Saipan | N/A |
| 670-234 | Saipan | N/A |
| 670-235 | Saipan | N/A |
| 670-236 | Saipan | N/A |
| 670-237 | Saipan | 6/1/2005 |
| 670-256 | Saipan | N/A |
| 670-284 | Saipan | 4/20/2018 |
| 670-285 | Saipan | 1/25/2005 |
| 670-286 | Saipan | N/A |
| 670-287 | Saipan | N/A |
| 670-288 | Saipan | N/A |
| 670-321 | Saipan | N/A |
| 670-322 | Saipan | N/A |
| 670-323 | Saipan | N/A |
| 670-328 | Saipan | N/A |
| 670-433 | Tinian | N/A |
| 670-483 | Saipan | N/A |
| 670-484 | Saipan | 5/17/2002 |
| 670-488 | Tinian | 9/20/2004 |
| 670-532 | Rota | N/A |
| 670-588 | Rota | 9/17/2004 |
| 670-664 | Saipan | N/A |
| 670-682 | Saipan | N/A |
| 670-783 | Saipan | 1/31/2013 |
| 670-785 | Saipan | 7/2/2010 |
| 670-788 | Saipan | N/A |
| 670-789 | Saipan | 2/26/2007 |
| 670-838 | Saipan | 8/25/2004 |
| 670-848 | Saipan | 10/10/2008 |
| 670-858 | Saipan | 10/10/2008 |
| 670-868 | Saipan | 3/10/2003 |
| 670-878 | Saipan | 1/13/2005 |
| 670-888 | Saipan | 7/30/2002 |
| 670-898 | Saipan | 8/24/2004 |
| 670-989 | Saipan | 4/5/2005 |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date. N/A - mostly central office codes assigned before 2001.
- NXX prefixes last updated: June 3, 2025
Cities in area code 670
| City1 | County | Time Zone1 |
|---|---|---|
| Capitol Hill | Saipan | ChST |
| Chalan Kanoa | Saipan | ChST |
| Dandan | Saipan | ChST |
| Finasisu | Saipan | ChST |
| Garapan | Saipan | ChST |
| Gualo Rai | Saipan | ChST |
| Kagman | Saipan | ChST |
| Koblerville | Saipan | ChST |
| Rota | ChST | |
| Saipan | ChST | |
| San Antonio | Saipan | ChST |
| San Jose | Tinian | ChST |
| San Jose Village | Saipan | ChST |
| San Vincente | Saipan | ChST |
| Sinapalo | Rota | ChST |
| Susupe | Saipan | ChST |
| Tinian | ChST |
- Listed above are most places served by Northern Mariana area code 670. When multiple places share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- ChST stands for Chamorro Standard Time (currently ).