The area code 670 is located in saipan, northern mariana islands.
Area code 670 covers the Commonwealth of the Northern Mariana Islands (CNMI) in the western Pacific, with service centered on Saipan and extending to Tinian and Rota. This U.S. commonwealth sits just north of Guam in the Mariana Islands chain. As part of the North American Numbering Plan (NANP), phone numbers here are dialed like U.S. numbers: 1 + 670 + seven digits. Local time is Chamorro Standard Time (UTC+10).
Major communities and landmarks in area code 670 include:
Introduced to the North American Numbering Plan in 1997. (Source: NANPA)
Area code 670 was introduced in 1997 when CNMI joined the NANP, replacing earlier international dialing. There are no overlays or splits; 670 remains the single area code for the islands. Both landline and mobile phone numbers use the same code. From outside the NANP, dial the +1 country code, then 670 and the local number.
Interesting trivia: the former international country code +670 is now assigned to Timor‑Leste (East Timor), not the Northern Mariana Islands. Most residents live on Saipan, but the area code still covers communities across Tinian, Rota, and the sparsely populated Northern Islands. Notable sights such as American Memorial Park, Mount Tapochau, and Banzai Cliff lie within the 670 calling area.
The 670 area code connects a compact, strategic region of Micronesia where government, tourism, and everyday services rely on simple U.S.-style dialing. Airports like Saipan International, Tinian International, and Rota International serve the islands and use 670 phone numbers for travel and logistics. Because CNMI is in the NANP, 670 numbers route like domestic long-distance from the U.S. and Canada.