| General Information about Area Code 636 | |
|---|---|
| Country | United States |
| State / Province / Territory | Missouri |
| Major City | St. Charles |
| Time Zone | Central (UTC-06:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 636-600 | Saint Louis | Saint Louis | Landline |
| 636-497 | Wentzville | Saint Charles | Wireless |
| 636-429 | Eureka | Saint Louis | Landline |
| 636-266 | Washington | Franklin | Landline |
| 636-279 | Saint Peters | Saint Charles | Landline |
| 636-573 | Saint Charles | Saint Charles | Landline |
| 636-463 | Foristell | Saint Charles | Landline |
| 636-933 | Festus | Jefferson | Landline |
| 636-633 | Imperial | Jefferson | Wireless |
| 636-939 | Saint Charles | Saint Charles | Landline |
| 636-547 | Imperial | Jefferson | Landline |
| 636-337 | Valles Mines | Saint Francois | Landline |
| 636-764 | Fenton | Saint Louis | Landline |
| 636-517 | Valley Park | Saint Louis | Landline |
| 636-893 | Saint Louis | Saint Louis | Landline |
| 636-566 | Winfield | Lincoln | Landline |
| 636-734 | Saint Louis | Saint Louis | Wireless |
| 636-391 | Ballwin | Saint Louis | Landline |
| 636-937 | Festus | Jefferson | Landline |
| 636-232 | Festus | Jefferson | Landline |