List of highways numbered 51
The following highways are numbered 51:
Australia
- Kamilaroi Highway
- Plenty Road
Cambodia
- Road 51 (Cambodia)">Road 51 (Iran)">Road 51 (Cambodia)
Canada
Cuba
Finland
France
Greece
Hungary
India
Iran
Italy
Japan
South Korea
*Lebanon
New Zealand
Philippines
South Africa
Turkey
United Kingdom
United States
- U.S. Route 51
- Alabama State Route 51
- Arizona State Route 51
- Arkansas Highway 51
- California State Route 51
- Colorado State Highway 51 (1923-1968)
- Florida State Road 51
- * County Road 51 (Hamilton County, Florida)
- Georgia State Route 51
- * Georgia State Route 51 (1920)
- Hawaii Route 51
- Idaho State Highway 51
- Illinois Route 51
- Indiana State Road 51
- Iowa Highway 51
- K-51 (Kansas highway)
- Maryland Route 51
- *Maryland Route 51A
- *Maryland Route 51B
- *Maryland Route 51C
- *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
- * 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)
- West Virginia Route 51
- * West [Virginia Route 51 (1920s)]
- * West Virginia Route 51 (1930s)
- Wisconsin Highway 51
- Wyoming Highway 51