List of highways numbered 51

Australia

• Kamilaroi Highway

  Cambodia

• National Road 51

  Canada

• Alberta Highway 51
• Saskatchewan Highway 51

  France

• A51 autoroute

  Hungary

• M51 expressway

  India

• National Highway 51

  Iran

• Zobahan Freeway
• Road 51

  Japan

• Route 51

  Korea, South

• New Zealand

• State Highway 51

  Philippines

• National Route 51

  South Africa

• R51

  Turkey

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

  United Kingdom

• British A51

  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
• Florida State Road 51
• * County Road 51
• Georgia State Route 51
• * Georgia State Route 51
• Hawaii Route 51
• Idaho State Highway 51
• Illinois Route 51
• Indiana State Road 51
• Iowa Highway 51
• K-51
• Maryland Route 51
• *Maryland Route 51A
• *Maryland Route 51B
• *Maryland Route 51C
• *Maryland Route 51D
• *Maryland Route 51E
• *Maryland Route 51F
• M-51
• Minnesota State Highway 51
• * County Road 51
• * County Road 51
• 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
• ** County Route S51
• * County Route 51
• New Mexico State Road 51
• New York State Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• * County Route 51
• 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
• West Virginia Route 51
• * West Virginia Route 51
• * West Virginia Route 51
• Wisconsin Highway 51
• Wyoming Highway 51

  Vietnam

• National Road 51