The following highways are numbered 312:
Canada Manitoba Provincial Road 312 Nova Scotia Route 312 Prince Edward Island Route 312 Saskatchewan Highway 312
China China National Highway 312
Costa Rica National Route 312
Cuba
Road to Las Palacios (1–312)
Japan Japan National Route 312
United Kingdom A312 road, Hampton to Harrow
United States U.S. Route 312 (former) Arkansas Highway 312 Florida State Road 312 Georgia State Route 312 (former) Indiana State Road 312 Kentucky Route 312 Louisiana Highway 312 Maryland Route 312 Minnesota State Highway 312 (former) New Mexico State Road 312 New York: New York State Route 312 New York State Route 312 (former) County Route 312 (Albany County, New York) County Route 312 (Wayne County, New York) Ohio State Route 312 Pennsylvania Route 312 (former) Puerto Rico Highway 312 Tennessee State Route 312 Texas: Texas State Highway 312 (proposed) Texas State Highway Spur 312 Farm to Market Road 312 Utah State Route 312 Virginia State Route 312 Wisconsin Highway 312 Wyoming Highway 312