Locations for Area Code - 618

Area code 618 covers southern Illinois, including cities like Belleville, Carbondale, and East St. Louis. Established in 1947, it serves a mostly rural and suburban region known for agriculture, education, and historical river towns along the Mississippi. The code is closely linked with Southern Illinois University and the region’s unique cultural blend of Midwest and Southern influences. It stands alone without overlays, so local calls typically require only seven digits. 618 remains a stable identifier for a large, diverse part of Illinois.