List of highways numbered 678
# List of highways numbered 678

The following highways are numbered 678:

## Canada

* Hwy 678

## United States

* I-678
* SR 678
* LA 678
* MD 678 (former)
* SR 678
* PR-678
* FM 678
* SR 678

| Preceded by 677 | Lists of highways 678 | Succeeded by 679 |
| - | - | - |
