The following highways are numbered 403:
Canada
Costa Rica
Croatia
Hungary
Japan
Thailand
United States
Georgia State Route 403 (unsigned designation for Interstate 85)
Indiana State Road 403 (former)- New York:
North Carolina Highway 403
Pennsylvania Route 403
Puerto Rico Highway 403
Rhode Island Route 403
South Carolina Highway 403
Virginia State Route 403
Washington State Route 403
| Preceded by 402 |
Lists of highways 403 |
Succeeded by 404 |
