670
Area code
CNMI
United States geographic area code, in service since 1997-07-01.
Statusin service
Introduced1997-07-01
JurisdictionCNMI, US
Local dialing7D
Last verified2026-09-17
Utilization 6.4% of assignable prefixes assigned
As of 09/17/2026
0%51 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2002-05-17, most recent 2018-04-20.
Area codes serve rate-center geographies, not municipal boundaries. “CNMI” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | PTI PACIFICA INC. | 15 | 29.4% |
| 02 | MICRONESIAN TELECOMMUNICATIONS CORPORATION | 15 | 29.4% |
| 03 | MULTIPLE OCN LISTING | 9 | 17.6% |
| 04 | 7 | 13.7% | |
| 05 | GUAM WIRELESS TELEPHONE COMPANY, LLC | 5 | 9.8% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 1997-07-01Area code 670 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 1996-09-04 | PL-010 ↗ | NANP-Introduction of New 670 (CNMI) Numbering Plan Area (NPA) |