| 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 |
|---|---|---|---|
| 636-444 | Saint Louis | Saint Louis | Landline |
| 636-524 | Festus | Jefferson | Landline |
| 636-343 | Fenton | Saint Louis | Landline |
| 636-735 | Chesterfield | Saint Louis | Landline |
| 636-235 | Warrenton | Warren | Landline |
| 636-669 | Saint Charles | Saint Charles | Landline |
| 636-629 | Saint Clair | Franklin | Landline |
| 636-205 | Winfield | Lincoln | Landline |
| 636-744 | Washington | Franklin | Landline |
| 636-527 | Ballwin | Saint Louis | Landline |
| 636-219 | Saint Charles | Saint Charles | Wireless |
| 636-660 | Fenton | Saint Louis | Landline |
| 636-458 | Grover | Saint Louis | Landline |
| 636-206 | Saint Charles | Saint Charles | Landline |
| 636-356 | Moscow Mills | Lincoln | Landline |
| 636-373 | Saint Charles | Saint Charles | Wireless |
| 636-475 | Herculaneum | Jefferson | Landline |
| 636-250 | Saint Charles | Saint Charles | Landline |
| 636-827 | Valley Park | Saint Louis | Landline |
| 636-485 | Saint Peters | Saint Charles | Wireless |