List of highways numbered 503

The following highways are numbered 503:

Canada

 * Alberta_Highway_503.svg Alberta Highway 503
 * Manitoba secondary 503.svg Manitoba Provincial Road 503
 * NL Route 503.svg Newfoundland and Labrador Route 503
 * Ontario Highway 503 (former)

Costa Rica

 * CR RNT 503.svg National Route 503

India

 * NH503-IN.svg National Highway 503 (India)

Japan

 * Japanese National Route Sign 0503.svg Japan National Route 503

United States

 * Brevard County Road 503 FL.svg County Road 503 (Brevard County, Florida)
 * MD Route 503.svg Maryland Route 503 (former)
 * County 503.svg County Route 503 (New Jersey)
 * OH-503.svg Ohio State Route 503
 * WA-503.svg Washington State Route 503
 * Territories:
 * PR secondary 503.svg Puerto Rico Highway 503