List of highways numbered 603
# List of highways numbered 603

The following highways are numbered 603:

## Canada

* Alberta Highway 603
* Ontario Highway 603
* Saskatchewan Highway 603

## Costa Rica

* National Route 603

## United States

* SR 603
* PR-603
* FM 603
* SR 603
* SR 603 (former)

| Preceded by 602 | Lists of highways 603 | Succeeded by 604 |
| - | - | - |
