Northern Mariana Islands area code: 670 explained
The only area code for the Northern Mariana Islands is 670, and it has been in service since 1997.
- The area code
- 670
- Service start year
- 1997
- Local time zone
- Chamorro (UTC+10)
- Expected exhaustion
- More than 100 years from now
- From outside the country
- The 7-digit number with the +1 670 prefix
Source: NANPA exhaust projections, area code report and rate-centre report, file of 11/01/2026. This is not an official NANPA site.
The way Northern Mariana Islands got its area code
Since 1997, the code 670 has covered Northern Mariana Islands, and NANPA shows no area code split away from 670.
Is a new area code coming to Northern Mariana Islands?
Not in this century. NANPA forecasts that 670 will last more than 100 years.
| NANPA forecast | Forecast exhaust |
|---|---|
| 2026.1 | More than 100 years from now |
| 2025.2 | 2110 1Q |
| 2025.1 | 2110 1Q |
| 2024.2 | 2110 1Q |
| 2024.1 | 2110 1Q |
| 2023.2 | 2110 1Q |
Questions about the Northern Mariana Islands area code
Which area code does Northern Mariana Islands use?
The whole territory uses 670.
How can I get a number in Northern Mariana Islands?
For a 670 number, turn to any provider that assigns local numbers. Compare first-year cost across providers.
When calling locally in Northern Mariana Islands, do I need the area code?
No. Within area code 670, local calls need 7 digits, while long-distance calls need 1 + 10-digit dialling. Among the 378 US area codes that are in service, only 54 still allow 7-digit local calls. When calling from abroad, start with +1 670.