| District of Missouri area codes: 636 | |
|---|---|
| Country | United States |
| State/Province | Missouri |
| Major City | Saint Louis |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 636-282 | Jefferson | Maxville, MO | Southwestern Bell |
| 636-283 | Franklin | Washington, MO | Teleport Communications Group - St. Louis |
| 636-284 | Saint Charles | Harvester, MO | New Cingular Wireless PCS - IL |
| 636-285 | Jefferson | Cedar Hill, MO | Southwestern Bell |
| 636-287 | Jefferson | Maxville, MO | Southwestern Bell |
| 636-288 | Saint Charles | Saint Charles, MO | New Cingular Wireless PCS - IL |
| 636-290 | Lincoln | Troy, MO | T-mobile Usa |
| 636-293 | Saint Charles | O Fallon, MO | T-mobile Usa |
| 636-294 | Saint Charles | O Fallon, MO | Charter Fiberlink |
| 636-295 | Lincoln | Troy, MO | Cellco Partnership DBA Verizon Wireless |
| 636-296 | Jefferson | Maxville, MO | Southwestern Bell |
| 636-297 | Warren | Warrenton, MO | Cellco Partnership DBA Verizon Wireless |
| 636-299 | Saint Louis | Chesterfield, MO | AT&T Local |
| 636-300 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-305 | Saint Louis | Fenton, MO | Southwestern Bell |
| 636-306 | Metro PCS | ||
| 636-320 | Saint Charles | Harvester, MO | Usa Mobility Wireless |
| 636-321 | Jefferson | Maxville, MO | Windstream Nuvox Missouri Inc. |
| 636-322 | Franklin | Saint Clair, MO | Southwestern Bell |
| 636-323 | Jefferson | House Springs, MO | Level 3 Communications |
There are 353 prefixes, In the code area, the major cities are Ballwin, MO;Chesterfield, MO;O'fallon, MO;St. Char. The major city is Saint Louis.