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The following highways are numbered 51:
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The following highways are numbered 51:
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Kamilaroi Highway 
Plenty Road
Alberta Highway 51 (defunct)
Saskatchewan Highway 51 
Caimito–Salado Road (2–51)
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 
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 
M-51 (Michigan highway) 
Minnesota State Highway 51 
Missouri Route 51 
Nebraska Highway 51 
Nevada State Route 51 
New Hampshire Route 51 
New Jersey Route 51 (former) 
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 
Oregon Route 51 
Pennsylvania Route 51 
Rhode Island Route 51 
South Carolina Highway 51 
Tennessee State Route 51 
Texas State Highway 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 | Preceded by 50 | Lists of highways 51 | Succeeded by 52 |
Maryland Route 51 is a state highway in the U.S. state of Maryland. Known for most of its length as Oldtown Road, the state highway runs 25.53 miles (41.09 km) from an interchange with Interstate 68 (I-68) in Cumberland south to the West Virginia state line at the Potomac River, where the highway continues east as West Virginia Route 9 toward Paw Paw. Around Cumberland, MD 51 is a major highway that provides a bypass of the South End neighborhood of that city and access to industrial areas along the North Branch Potomac River. South of North Branch, MD 51 is a rural highway connecting small communities along the river in southeastern Allegany County, including Oldtown. Documentation from the Maryland State Highway Administration depict the highway as following an east-west alignment, but all signage indicates a north-south road.
