| Area Code | 618 |
| State | Illinois |
| Current Time in Area Code 618 | 618> CST |
| Timezone | Central Standard Time |
| Regional Market Area | Evansville Area Metro St. Louis Paducah-Cape Girardeau-Harrisburg-Mt Vernon Area Terre Haute Area |
| Metro Area(s) | Carbondale-Marion, IL Centralia, IL Mount Vernon, IL Paducah, KY-IL |
| Population (2020) | 1176206 |
| Adjacent Area Codes | 217,270,314,364,447,573,636,730,812,930 |
| Overlay Area Codes | 730 |