| 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 |
|---|---|---|---|
| 636-445 | Wentzville | Saint Charles | Landline |
| 636-534 | Chesterfield | Saint Louis | Landline |
| 636-544 | Lake Saint Louis | Saint Charles | Wireless |
| 636-272 | Lake Saint Louis | Saint Charles | Landline |
| 636-433 | Marthasville | Warren | Landline |
| 636-725 | Festus | Jefferson | Landline |
| 636-795 | Saint Charles | Saint Charles | Wireless |
| 636-498 | Saint Charles | Saint Charles | Landline |
| 636-208 | Festus | Jefferson | Wireless |
| 636-942 | Imperial | Jefferson | Landline |
| 636-403 | Saint Charles | Saint Charles | Wireless |
| 636-395 | Saint Charles | Saint Charles | Landline |
| 636-249 | Union | Franklin | Wireless |
| 636-216 | Maryland Heights | Saint Louis | Landline |
| 636-230 | Ballwin | Saint Louis | Landline |
| 636-978 | Lake Saint Louis | Saint Charles | Landline |
| 636-535 | Festus | Jefferson | Wireless |
| 636-692 | House Springs | Jefferson | Landline |
| 636-338 | Hawk Point | Lincoln | Landline |
| 636-366 | Moscow Mills | Lincoln | Landline |