| 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 |
|---|---|---|---|
| 618-242 | Jefferson | Mount Vernon, IL | Ameritech Illinois |
| 618-243 | Washington | Okawville, IL | Frontier North |
| 618-244 | Jefferson | Mount Vernon, IL | Ameritech Illinois |
| 618-245 | Fayette | Farina, IL | Citizens Telecom Co Illinois-frontier Citizens -il |
| 618-246 | Jefferson | Mount Vernon, IL | Ameritech Illinois |
| 618-247 | Marion | Sandoval, IL | Citizens Telecom Co Illinois-frontier Citizens -il |
| 618-248 | Clinton | Albers, IL | Frontier North |
| 618-249 | Washington | Richview, IL | Citizens Telecom Co Illinois-frontier Citizens -il |
| 618-250 | Madison | Collinsville, IL | Leap Wireless Intl DBA Cricket Comm |
| 618-251 | Madison | Wood River, IL | Ameritech Illinois |
| 618-252 | Saline | Harrisburg, IL | Frontier North |
| 618-253 | Saline | Harrisburg, IL | Frontier North |
| 618-254 | Madison | Wood River, IL | Ameritech Illinois |
| 618-255 | Madison | Wood River, IL | Ameritech Illinois |
| 618-256 | Saint Clair | Belleville, IL | Ameritech Illinois |
| 618-257 | Saint Clair | Belleville, IL | Ameritech Illinois |
| 618-258 | Madison | Wood River, IL | Ameritech Illinois |
| 618-259 | Madison | Wood River, IL | Ameritech Illinois |
| 618-260 | Saline | Raleigh, IL | Aero Communications, Inc |
| 618-261 | Saint Clair | E St Louis, IL | Ameritech Illinois |
There are 692 prefixes, In the code area, the major cities are Alton, IL;Belleville, IL;Carbondale, IL;Collinsvil. The major city is Belleville.