List of highways numbered 603
The following highways are numbered 603:
Canada
Costa Rica
United States
County Route 603 (Atlantic County, New Jersey)- County Route 603 (Burlington County, New Jersey)
- County Route 603 (Camden County, New Jersey)
- County Route 603 (Cape May County, New Jersey)
- County Route 603 (Cumberland County, New Jersey)
- County Route 603 (Essex County, New Jersey)
- County Route 603 (Hudson County, New Jersey)
- County Route 603 (Hunterdon County, New Jersey)
- County Route 603 (Middlesex County, New Jersey)
- County Route 603 (Morris County, New Jersey)
- County Route 603 (Ocean County, New Jersey)
- County Route 603 (Passaic County, New Jersey)
- County Route 603 (Salem County, New Jersey)
- County Route 603 (Somerset County, New Jersey)
- County Route 603 (Sussex County, New Jersey)
- County Route 603 (Union County, New Jersey)
SR 603
PR-603
FM 603
SR 603
SR 603 (former)
| Preceded by 602 |
Lists of highways 603 |
Succeeded by 604 |
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