List of highways numbered 646
# List of highways numbered 646

The following highways are numbered 646:

## Canada

* Hwy 646

## United States

* LA 646 (former)
* MD 646
* SR 646
* SR 646
* PA 646
* PR-646
* FM 646
* SR 646

| Preceded by 645 | Lists of highways 646 | Succeeded by 647 |
| - | - | - |
