The following highways are numbered 318:
Canada Nova Scotia Route 318 Prince Edward Island Route 318 Saskatchewan Highway 318
China China National Highway 318
Costa Rica National Route 318
Japan Japan National Route 318
United States Arkansas Highway 318 Colorado State Highway 318 Connecticut Route 318 Florida: Florida State Road 318 (former) County Road 318, several roads in Florida Georgia State Route 318 (former) Indiana State Road 318 (former) Louisiana Highway 318 Maryland Route 318 Minnesota State Highway 318 (former) Montana Secondary Highway 318 Nevada State Route 318 New York: New York State Route 318 County Route 318 (Wayne County, New York) Ohio State Route 318 (former) Pennsylvania Route 318 Tennessee State Route 318 Texas: Texas State Highway 318 (former) Farm to Market Road 318 Utah State Route 318 Virginia State Route 318 Wyoming Highway 318
Other areas: Puerto Rico Highway 318 U.S. Virgin Islands Highway 318