Area code and exchange code is assigned to every constituent of city in the United States. The area and exchange codes of the telephone can be used to find information about a region. Area code 919 and exchange code 355 is assigned to Apex. The latitude and longitude corresponding to 35.72 and -78.84 can be used to find an area on the map. Newsouth Communications Corp. - Ncoperates most of the land lines in United States.