The 618 area code is located in Belleville, Illinois including Benton, Carbondale, Anna, Mount Vernon and was originally put into service on February 4th 1994. Since 618 was implemented, it has grown to 218 cities. The 618 area code currently has 686 phone number prefixes from carriers like Cellco Partnership DBA Verizon Wireless, New Cingular Wireless PCS, Sprint Spectrum L.p., Windstream Nuvox Illinois and more.