Carterville, IL is currently served by one area code which is area code 618. Area code 618 was one of the original area codes assigned to Illinois when it was established in 1947. Area code 618 covers the southern portion of Illinois
In addition to Carterville, IL area code 618 serves a large area of southern Illinois including the larger cities and communities of Belleville, Carbondale, Collinsville, East St. Louis, Edwardsville, Granite City and O'Fallon in addition to many smaller communities within the area code 618 service area.
Carterville, IL is located in Williamson County and observes the Central Time Zone.
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