618 Area Code: Cities, Time Zone and Zip Codes
What area code is 618? The area code 618 is located in Illinois and it serves Belleville, Granite City, O’Fallon, Alton, East St. Louis, Carbondale, Collinsville, Edwardsville, Godfrey, Marion, Fairview Heights, and some other surrounding cities. Area code 618 was created on January 1, 1947 and was first put to use on January 1, 1947.