The following highways are numbered 51:

This list is incomplete; you can help by adding missing items. (August 2008)

• Kamilaroi Highway
• Plenty Road

• National Road 51 (Cambodia)

• Alberta Highway 51 (defunct)
• Saskatchewan Highway 51

• Caimito–Salado Road (2–51)

• Finnish national road 51

• A51 autoroute

• EO51 road

• M51 expressway (Hungary)

• National Highway 51 (India)

• Zobahan Freeway
• Road 51

• Autostrada A51

• Japan National Route 51

• National Route 51 [ko]

• New Zealand State Highway 51

• N51 highway (Philippines)

• R51

• O-51, a motorway in Turkey running from Adana to Mersin.

• British A51 (Kingsbury-Chester)

• U.S. Route 51
• Alabama State Route 51
• Arizona State Route 51
• Arkansas Highway 51
• California State Route 51 (unsigned)
• Colorado State Highway 51 (1923-1968) (former)
• Florida State Road 51
  • County Road 51 (Hamilton County, Florida)
• Georgia State Route 51
  • Georgia State Route 51 (1920) (former)
• Hawaii Route 51
• Idaho State Highway 51
• Illinois Route 51 (former)
• Indiana State Road 51
• Iowa Highway 51
• K-51 (Kansas highway)
• Maryland Route 51
  • Maryland Route 51A
  • Maryland Route 51B (former)
  • Maryland Route 51C (former)
  • Maryland Route 51D
  • Maryland Route 51E
  • Maryland Route 51F
• M-51 (Michigan highway)
• Minnesota State Highway 51
  • County Road 51 (Anoka County, Minnesota)
  • County Road 51 (Ramsey County, Minnesota)
• Missouri Route 51
• Nebraska Highway 51
  • Nebraska Link 51A
  • Nebraska Link 51B
  • Nebraska Link 51C
  • Nebraska Recreation Road 51E
  • Nebraska Recreation Road 51F
  • Nebraska Recreation Road 51G
  • Nebraska Recreation Road 51H
• Nevada State Route 51
• New Hampshire Route 51
• New Jersey Route 51 (former)
  • County Route 51 (Bergen County, New Jersey)
    • County Route S51 (Bergen County, New Jersey)
  • County Route 51 (Monmouth County, New Jersey)
• New Mexico State Road 51
• New York State Route 51
  • County Route 51 (Cayuga County, New York)
  • County Route 51 (Dutchess County, New York)
  • County Route 51 (Erie County, New York)
  • County Route 51 (Essex County, New York)
  • County Route 51 (Franklin County, New York)
  • County Route 51 (Greene County, New York)
  • County Route 51 (Herkimer County, New York)
  • County Route 51 (Madison County, New York)
  • County Route 51 (Oneida County, New York)
  • County Route 51 (Orange County, New York)
  • County Route 51 (Putnam County, New York)
  • County Route 51 (Rensselaer County, New York)
  • County Route 51 (Rockland County, New York)
  • County Route 51 (Saratoga County, New York)
  • County Route 51 (Schoharie County, New York)
  • County Route 51 (Suffolk County, New York)
  • County Route 51 (Sullivan County, New York)
  • County Route 51 (Ulster County, New York)
• North Carolina Highway 51
• Ohio State Route 51
• Oklahoma State Highway 51
  • Oklahoma State Highway 51A
  • Oklahoma State Highway 51B
• Oregon Route 51
• Pennsylvania Route 51
• Rhode Island Route 51
• South Carolina Highway 51
• Tennessee State Route 51
• Texas State Highway 51
  • Texas State Highway Spur 51
  • Farm to Market Road 51
  • Texas Park Road 51
• Utah State Route 51
• Virginia State Route 51
  • Virginia State Route 51 (1928-1950) (former)
• West Virginia Route 51
  • West Virginia Route 51 (1920s) (former)
  • West Virginia Route 51 (1930s) (former)
• Wisconsin Highway 51 (former)
• Wyoming Highway 51

• National Road 51 (Vietnam)

• A51 (disambiguation)

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