| District of Illinois area codes: 618 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Belleville |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 618-304 | Saint Clair | East Saint Louis, IL | Cellco Partnership DBA Verizon Wireless |
| 618-305 | Jackson | Carbondale, IL | AT&T Local |
| 618-306 | Alexander | Cairo, IL | Cellco Partnership DBA Verizon Wireless |
| 618-307 | Madison | Collinsville, IL | Windstream Nuvox Illinois |
| 618-308 | Hamilton | Mc Leansboro, IL | Cellco Partnership DBA Verizon Wireless |
| 618-309 | Massac | Metropolis, IL | AT&T Local |
| 618-310 | Saint Clair | Belleville, IL | Level 3 Communications |
| 618-313 | Gallatin | Ridgway, IL | Cellco Partnership DBA Verizon Wireless |
| 618-314 | Washington | Nashville, IL | Cellco Partnership DBA Verizon Wireless |
| 618-315 | Jefferson | Mount Vernon, IL | New Cingular Wireless PCS |
| 618-316 | Jefferson | Mount Vernon, IL | Sprint Spectrum L.p. |
| 618-317 | Randolph | Sparta, IL | Cellco Partnership DBA Verizon Wireless |
| 618-318 | Perry | Pinckneyville, IL | Cellco Partnership DBA Verizon Wireless |
| 618-319 | Jackson | Carbondale, IL | Level 3 Communications |
| 618-320 | Richland | Olney, IL | New Cingular Wireless PCS |
| 618-321 | Madison | Collinsville, IL | American Messaging (am) |
| 618-322 | Marion | Centralia, IL | Cellco Partnership DBA Verizon Wireless |
| 618-323 | Marion | Iuka, IL | Ameritech Illinois |
| 618-324 | Madison | Collinsville, IL | American Messaging (am) |
| 618-325 | Madison | Collinsville, IL | American Messaging (am) |
There are 692 prefixes, In the code area, the major cities are Alton, IL;Belleville, IL;Carbondale, IL;Collinsvil. The major city is Belleville.