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 620 and exchange code 835 is assigned to Dodge City. The latitude and longitude corresponding to 37.78167 and -100.02322 can be used to find an area on the map. United Wireless Communications, Incoperates most of the land lines in United States.