| 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 |
|---|---|---|---|
| 636-496 | Saint Louis | Fenton, MO | Southwestern Bell |
| 636-497 | Saint Charles | Wentzville, MO | T-mobile Usa |
| 636-498 | Saint Charles | Harvester, MO | Southwestern Bell |
| 636-500 | Jefferson | Imperial, MO | Birch Telecom Of Missouri |
| 636-515 | Saint Charles | O Fallon, MO | New Cingular Wireless PCS - IL |
| 636-517 | Saint Louis | Valley Park, MO | Southwestern Bell |
| 636-519 | Saint Louis | Chesterfield, MO | Southwestern Bell |
| 636-524 | Jefferson | Crystal City, MO | Level 3 Communications |
| 636-525 | Jefferson | Imperial, MO | Southwestern Bell |
| 636-527 | Saint Louis | Manchester, MO | Southwestern Bell |
| 636-528 | Lincoln | Troy, MO | Centurytel Missouri LLC (southwest)dba Centurylink |
| 636-529 | Saint Louis | Valley Park, MO | Southwestern Bell |
| 636-530 | Saint Louis | Chesterfield, MO | Southwestern Bell |
| 636-532 | Saint Louis | Chesterfield, MO | Southwestern Bell |
| 636-533 | Saint Louis | Fenton, MO | Xo Missouri |
| 636-534 | Saint Louis | Chesterfield, MO | Mci Worldcom Communications, Inc |
| 636-536 | Saint Louis | Chesterfield, MO | Southwestern Bell |
| 636-537 | Saint Louis | Chesterfield, MO | Southwestern Bell |
| 636-538 | Saint Charles | Wentzville, MO | T-mobile Usa |
| 636-541 | Saint Charles | Saint Charles, MO | New Cingular Wireless PCS - IL |
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.