| 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 |
|---|---|---|---|
| 636-481 | Hillsboro | Jefferson | Landline |
| 636-926 | Saint Charles | Saint Charles | Landline |
| 636-375 | High Ridge | Jefferson | Landline |
| 636-736 | Chesterfield | Saint Louis | Landline |
| 636-388 | Union | Franklin | Landline |
| 636-224 | Pevely | Jefferson | Landline |
| 636-294 | Lake Saint Louis | Saint Charles | Landline |
| 636-400 | Portage Des Sioux | Saint Charles | Landline |
| 636-305 | Fenton | Saint Louis | Landline |
| 636-856 | Wentzville | Saint Charles | Landline |
| 636-999 | Pacific | Franklin | Landline |
| 636-464 | Imperial | Jefferson | Landline |
| 636-220 | Ballwin | Saint Louis | Landline |
| 636-717 | Fenton | Saint Louis | Landline |
| 636-551 | Cedar Hill | Jefferson | Wireless |
| 636-582 | Union | Franklin | Landline |
| 636-277 | Saint Charles | Saint Charles | Landline |
| 636-287 | Arnold | Jefferson | Landline |
| 636-209 | Festus | Jefferson | Wireless |
| 636-333 | Arnold | Jefferson | Landline |