How to call Northern Mariana from the USA or from Canada:

Calling Northern Mariana Islands from the United States explained:

• 1 - Country Code for Northern Mariana Islands
• 670 - area code within the NANP
• local phone number - 7 digits
• US to Northern Mariana Islands international dialing format: 1 670 ??? ????
• this US territory is part of the North American Numbering Plan - NANP (calling it works like a US state to state call)

Phone Books:

• The CNMI Phone Book - White and Yellow Pages for Northern Marianas