| 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 |
|---|---|---|---|
| 618-262 | Wabash | Mt Carmell, IL | Frontier North |
| 618-263 | Wabash | Mt Carmell, IL | Frontier North |
| 618-264 | Saline | Herod, IL | Shawnee Telephone Co. |
| 618-265 | Gallatin | New Haven, IL | Frontier North |
| 618-266 | Marion | Kell, IL | Ameritech Illinois |
| 618-267 | Marion | Centralia, IL | Cellco Partnership DBA Verizon Wireless |
| 618-268 | Saline | Raleigh, IL | Frontier North |
| 618-269 | Gallatin | Shawneetown, IL | Frontier North |
| 618-271 | Saint Clair | E St Louis, IL | Ameritech Illinois |
| 618-272 | Gallatin | Ridgway, IL | Frontier North |
| 618-273 | Saline | Eldorado, IL | Frontier North |
| 618-274 | Saint Clair | E St Louis, IL | Ameritech Illinois |
| 618-275 | Gallatin | Junction, IL | Shawnee Telephone Co. |
| 618-276 | Gallatin | Equality, IL | Shawnee Telephone Co. |
| 618-277 | Saint Clair | Belleville, IL | Ameritech Illinois |
| 618-278 | Macoupin | Woodburn, IL | Frontier Communications Of Midland |
| 618-279 | Jefferson | Waltonville, IL | Citizens Telecom Co Illinois-frontier Citizens -il |
| 618-280 | Gallatin | Shawneetown, IL | Aero Communications, Inc |
| 618-281 | Monroe | Columbia, IL | Harrisonville Telephone Co. |
| 618-282 | Randolph | Red Bud, IL | Harrisonville Telephone Co. |
There are 692 prefixes, In the code area, the major cities are Alton, IL;Belleville, IL;Carbondale, IL;Collinsvil. The major city is Belleville.