Northern Mariana Islands 市外局番: 670
Note：670 市外局番は Northern Mariana Islands, アメリカ合衆国. 国際番号は 001670 or 001-670、0010670、+1-670、+1+670、+1670、00-1-670、00 1 670.
More About Area Code 670
Area code 670 was first put in service July 1, 1997. Currently, it covers the entire state of Northern Mariana Islands, and it overlaps coverage areas with area code .
Active Phone Number Prefixes
| Prefix | Usage | Primary City | Carrier |
| (670) 233- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 234- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 235- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 236- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 237- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 256- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 285- | Unknown | Pti Pacifica Inc. | |
| (670) 286- | Unknown | Pti Pacifica Inc. | |
| (670) 287- | Unknown | Pti Pacifica Inc. | |
| (670) 288- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 321- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 322- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 323- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 328- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 433- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 483- | Unknown | Guam Cell & Paging DBA Saipan Cellular & Paging | |
| (670) 484- | Unknown | Guam Cell & Paging DBA Saipan Cellular & Paging | |
| (670) 488- | Unknown | Guam Cell & Paging DBA Saipan Cellular & Paging | |
| (670) 532- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 588- | Unknown | Guam Cell & Paging DBA Saipan Cellular & Paging | |
| (670) 664- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 682- | Unknown | Micronesian Telecommunications Corp. | |
| (670) 783- | Unknown | Pti Pacifica Inc. | |
| (670) 785- | Unknown | Pti Pacifica Inc. | |
| (670) 788- | Unknown | Pti Pacifica Inc. | |
| (670) 789- | Unknown | Pti Pacifica Inc. | |
| (670) 838- | Unknown | Wave Runner | |
| (670) 848- | Unknown | Wave Runner | |
| (670) 858- | Unknown | Wave Runner | |
| (670) 868- | Unknown | Choice Phone LLC DBA Iconn | |
| (670) 878- | Unknown | Choice Phone LLC DBA Iconn | |
| (670) 888- | Unknown | Choice Phone LLC DBA Iconn | |
| (670) 898- | Unknown | Choice Phone LLC DBA Iconn | |
| (670) 989- | Unknown | Guam Cell & Paging DBA Saipan Cellular & Paging |
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