The following highways are numbered 503:

This list is incomplete; you can help by adding missing items. (October 2010)

Canada

• Alberta Highway 503
• Manitoba Provincial Road 503
• Newfoundland and Labrador Route 503
• Ontario Highway 503 (former)

Costa Rica

• National Route 503

India

• National Highway 503 (India)

Japan

• Japan National Route 503

United States

• County Road 503 (Brevard County, Florida)
• Maryland Route 503 (former)
• County Route 503 (New Jersey)
• Ohio State Route 503
• Washington State Route 503

Territories

• Puerto Rico Highway 503

This article includes a list of roads, streets, highways, or other routes that are associated with the same title.
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