Geographic Regions and Area Codes

Area code 618 is located in the southern part of Illinois, covering a wide range of cities and towns. Some of the major cities include Belleville, Carbondale, Alton, Edwardsville, Marion, and East St. Louis. The area code spans approximately 15,458 square miles, encompassing parts of the Shawnee National Forest and the Mississippi River Valley. This region is also served by an overlay area code, 730, which ensures sufficient telephone number availability for the future. Nearby area codes include 217, 270/364, 314, 573, 636, 765, and 812/930.