The following highways are numbered 312:

Canada

  • 20px Manitoba Provincial Road 312
  • 25px Nova Scotia Route 312
  • 20px Prince Edward Island Route 312
  • 20px Saskatchewan Highway 312

China

  • 25px China National Highway 312

Costa Rica

  • 25px National Route 312

Cuba

  • 28x28px Road to Las Palacios (1–312)

Japan

  • 25px Japan National Route 312

United Kingdom

  • UK_road_A1|45px A312 road, Hampton to Harrow

United States

  • 25px U.S. Route 312 (former)
  • 25px Arkansas Highway 312
  • 25px Florida State Road 312
  • 25px Georgia State Route 312 (former)
  • 25px Indiana State Road 312
  • 25px Kentucky Route 312
  • 25px Louisiana Highway 312
  • 25px Maryland Route 312
  • 25px Minnesota State Highway 312 (former)
  • 25px New Mexico State Road 312
  • New York:
  • 25px 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)
  • 25px Ohio State Route 312
  • 25px Pennsylvania Route 312 (former)
  • 25px Puerto Rico Highway 312
  • 25px Tennessee State Route 312
  • Texas:
  • 25px Texas State Highway 312 (proposed)
  • 25px Texas State Highway Spur 312
  • 25px Farm to Market Road 312
  • 25px Utah State Route 312
  • 25px Virginia State Route 312
  • 25px Wisconsin Highway 312
  • 25px Wyoming Highway 312