List of highways numbered 638
# List of highways numbered 638

Route 638, or Highway 638, may refer to:

## Canada

* Ontario Highway 638
* Saskatchewan Highway 638

## United Kingdom

* A638 road
* London Buses route 638

## United States

* MD 638
* SR 638
* PR-638
* FM 638
* SR 638

| Preceded by 637 | Lists of highways 638 | Succeeded by 639 |
| - | - | - |
