| 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 |
|---|---|---|---|
| 636-336 | Saint Charles | Saint Charles | Landline |
| 636-777 | Saint Louis | Saint Louis | Landline |
| 636-980 | Lake Saint Louis | Saint Charles | Landline |
| 636-390 | Washington | Franklin | Landline |
| 636-561 | O Fallon | Saint Charles | Landline |
| 636-722 | Saint Charles | Saint Charles | Landline |
| 636-203 | Fenton | Saint Louis | Landline |
| 636-383 | Troy | Lincoln | Wireless |
| 636-688 | Saint Louis | Saint Louis | Landline |
| 636-247 | Chesterfield | Saint Louis | Landline |
| 636-332 | Wentzville | Saint Charles | Landline |
| 636-671 | Eureka | Saint Louis | Landline |
| 636-797 | Hillsboro | Jefferson | Landline |
| 636-922 | Saint Charles | Saint Charles | Landline |
| 636-225 | Valley Park | Saint Louis | Landline |
| 636-794 | Saint Charles | Saint Charles | Landline |
| 636-614 | Lake Saint Louis | Saint Charles | Landline |
| 636-207 | Ballwin | Saint Louis | Landline |
| 636-244 | Saint Charles | Saint Charles | Landline |
| 636-275 | Imperial | Jefferson | Wireless |