| 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 |
|---|---|---|---|
| 636-724 | Saint Charles | Saint Charles | Landline |
| 636-477 | Saint Charles | Saint Charles | Landline |
| 636-246 | Saint Charles | Saint Charles | Landline |
| 636-329 | Saint Charles | Saint Charles | Landline |
| 636-828 | Foristell | Saint Charles | Landline |
| 636-925 | Saint Charles | Saint Charles | Landline |
| 636-461 | Imperial | Jefferson | Landline |
| 636-397 | Saint Peters | Saint Charles | Landline |
| 636-529 | Valley Park | Saint Louis | Landline |
| 636-258 | Saint Charles | Saint Charles | Landline |
| 636-696 | Lake Saint Louis | Saint Charles | Landline |
| 636-585 | High Hill | Montgomery | Landline |
| 636-542 | O Fallon | Saint Charles | Landline |
| 636-422 | Grover | Saint Louis | Landline |
| 636-936 | Saint Charles | Saint Charles | Landline |
| 636-227 | Ballwin | Saint Louis | Landline |
| 636-443 | Saint Charles | Saint Charles | Landline |
| 636-264 | Winfield | Lincoln | Landline |
| 636-259 | Gray Summit | Franklin | Wireless |
| 636-755 | O Fallon | Saint Charles | Landline |