| 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 |
|---|---|---|---|
| 636-493 | Saint Charles | Saint Charles | Landline |
| 636-530 | Chesterfield | Saint Louis | Landline |
| 636-673 | Foristell | Saint Charles | Landline |
| 636-751 | Ballwin | Saint Louis | Wireless |
| 636-281 | Lake Saint Louis | Saint Charles | Landline |
| 636-689 | Saint Louis | Saint Louis | Landline |
| 636-680 | Saint Louis | Saint Louis | Landline |
| 636-686 | Saint Louis | Saint Louis | Landline |
| 636-243 | Blackwell | Saint Francois | Landline |
| 636-775 | Troy | Lincoln | Landline |
| 636-662 | Foley | Lincoln | Landline |
| 636-326 | Fenton | Saint Louis | Landline |
| 636-742 | Gray Summit | Franklin | Landline |
| 636-442 | Saint Charles | Saint Charles | Landline |
| 636-306 | Pevely | Jefferson | Wireless |
| 636-377 | Warrenton | Warren | Landline |
| 636-970 | Saint Peters | Saint Charles | Landline |
| 636-489 | Chesterfield | Saint Louis | Landline |
| 636-434 | Portage Des Sioux | Saint Charles | Landline |
| 636-231 | Washington | Franklin | Landline |