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# The 670 Area Code and the North American Numbering Plan

The 670 area code serves the Northern Mariana Islands, a U.S. commonwealth located in the western Pacific Ocean. This area code covers all telephone exchanges throughout the archipelago, including the capital city of Saipan and other populated islands within the territory. Like other U.S. territories and possessions, the Northern Mariana Islands are included in the North American Numbering Plan (NANP), which ensures seamless telecommunications connectivity with the mainland United States and other participating regions. The 670 designation allows residents, businesses, and visitors to the Northern Mariana Islands to maintain integrated phone service with the broader North American telecommunications network.

The North American Numbering Plan is a standardized system that assigns three-digit area codes to geographic regions throughout North America, including the United States, Canada, and various U.S. territories. Each area code is paired with a seven-digit local phone number, creating the familiar ten-digit format used across the continent. The NANP, originally established in 1947, has been managed and maintained to ensure efficient call routing and prevent numbering conflicts. The assignment of 670 to the Northern Mariana Islands reflects the NANP's comprehensive approach to telecommunications infrastructure, enabling reliable long-distance dialing and emergency services coordination across all participating jurisdictions, regardless of their geographic location or population size.