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 681 and exchange code 404 is assigned to Clarksburg. The latitude and longitude corresponding to 39.27944 and -80.34447 can be used to find an area on the map. New Cingular Wireless Pcsoperates most of the land lines in United States.