| 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 |
|---|---|---|---|
| 636-591 | Ballwin | Saint Louis | Landline |
| 636-685 | Saint Louis | Saint Louis | Landline |
| 636-579 | Chesterfield | Saint Louis | Wireless |
| 636-916 | Saint Charles | Saint Charles | Landline |
| 636-987 | Defiance | Saint Charles | Landline |
| 636-459 | Foristell | Saint Charles | Wireless |
| 636-779 | Saint Louis | Saint Louis | Landline |
| 636-399 | Ballwin | Saint Louis | Wireless |
| 636-488 | Jonesburg | Montgomery | Landline |
| 636-733 | Chesterfield | Saint Louis | Landline |
| 636-344 | Saint Charles | Saint Charles | Landline |
| 636-639 | Wentzville | Saint Charles | Landline |
| 636-587 | Eureka | Saint Louis | Landline |
| 636-359 | Warrenton | Warren | Wireless |
| 636-285 | Cedar Hill | Jefferson | Landline |
| 636-441 | Saint Charles | Saint Charles | Landline |
| 636-233 | Saint Charles | Saint Charles | Landline |
| 636-284 | Saint Charles | Saint Charles | Wireless |
| 636-484 | Ballwin | Saint Louis | Wireless |
| 636-707 | Cedar Hill | Jefferson | Landline |