In the North American Numbering Plan, Area Code 828 is the telphone area code for the mountain regions of the U.S. state of North Carolina. The North American Numbering Plan (NANP) is a system for three-digit area codes and seven-digit telephone numbers that direct telephone calls to particular regions on a public switched telephone network (PSTN), where they are further routed by the local network. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... A state of the United States (a U.S. state) is any one of the fifty states (four of which officially favor the term commonwealth) which, along with the District of Columbia, form the United States of America. ... Official language(s) English Capital Raleigh Largest city Charlotte Area  Ranked 28th  - Total 53,865 sq mi (139,509 km²)  - Width 560 miles (901 km)  - Length 150 miles (240 km)  - % water 9. ...