| 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 |
|---|---|---|---|
| 636-648 | Bridgeton | Saint Louis | Landline |
| 636-274 | Cedar Hill | Jefferson | Landline |
| 636-448 | Saint Charles | Saint Charles | Wireless |
| 636-948 | Imperial | Jefferson | Landline |
| 636-435 | Valley Park | Saint Louis | Landline |
| 636-221 | Washington | Franklin | Landline |
| 636-538 | Wentzville | Saint Charles | Wireless |
| 636-586 | Valles Mines | Saint Francois | Landline |
| 636-931 | Festus | Jefferson | Landline |
| 636-500 | Imperial | Jefferson | Landline |
| 636-737 | Chesterfield | Saint Louis | Landline |
| 636-681 | Saint Louis | Saint Louis | Landline |
| 636-226 | Valley Park | Saint Louis | Landline |
| 636-412 | Ballwin | Saint Louis | Landline |
| 636-575 | High Ridge | Jefferson | Wireless |
| 636-578 | Saint Louis | Saint Louis | Wireless |
| 636-495 | House Springs | Jefferson | Landline |
| 636-384 | Wright City | Warren | Wireless |
| 636-938 | Eureka | Saint Louis | Landline |
| 636-402 | Gray Summit | Franklin | Landline |