| 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 |
|---|---|---|---|
| 636-320 | Saint Charles | Saint Charles | Wireless |
| 636-431 | Valley Park | Saint Louis | Landline |
| 636-665 | Old Monroe | Lincoln | Landline |
| 636-324 | Grover | Saint Louis | Landline |
| 636-492 | Fenton | Saint Louis | Landline |
| 636-256 | Ballwin | Saint Louis | Landline |
| 636-584 | Union | Franklin | Landline |
| 636-536 | Chesterfield | Saint Louis | Landline |
| 636-321 | Arnold | Jefferson | Landline |
| 636-299 | Chesterfield | Saint Louis | Landline |
| 636-944 | Hillsboro | Jefferson | Landline |
| 636-525 | Imperial | Jefferson | Landline |
| 636-723 | Saint Charles | Saint Charles | Landline |
| 636-590 | Bridgeton | Saint Louis | Landline |
| 636-355 | Foley | Lincoln | Landline |
| 636-720 | Saint Louis | Saint Louis | Landline |
| 636-322 | Union | Franklin | Landline |
| 636-753 | Portage Des Sioux | Saint Charles | Landline |
| 636-947 | Saint Charles | Saint Charles | Landline |
| 636-362 | Saint Charles | Saint Charles | Landline |