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 425 and exchange code 320 is assigned to Everett. The latitude and longitude corresponding to 47.92 and -122.22 can be used to find an area on the map. Level 3 Communications, Llc - Waoperates most of the land lines in United States.