New York State Route 51

New York State Route 51
NY 51 highlighted in red
Route information
Maintained by NYSDOT
Length	55.02 mi[1] (88.55 km)
Existed	1930[2]–present
Major junctions
South end	NY 8 in Guilford
Major intersections	NY 23 in Morris US 20 in West Winfield NY 5S in Ilion
North end	NY 5 in Herkimer
Location
Country	United States
State	New York
Counties	Chenango, Otsego, Herkimer
Highway system
New York Highways Interstate US State Reference Parkways
← NY 50 → NY 52

New York State Route 51 (NY 51) is a 55.02-mile-long (88.55 km) north–south state highway in the central part of the U.S. state of New York. The highway runs generally in a southwest to northeast direction from NY 8 in the hamlet of Mount Upton to north of the village of Ilion, where it ends at NY 5. NY 51 intersects several primary routes including, a short overlap with NY 23 in the village of Morris, a 2.8-mile (4.5 km) overlap with U.S. Route 20 (US 20) in Winfield, and NY 5S in Illion. NY 51 is a two-lane highway its entire length.

In the 1920s, a segment of modern NY 51 between West Burlington and West Winfield was designated as part of NY 44, a route that extended from Sidney to Utica. At the time, this was the only substantial segment of modern NY 51 to have a route number even though all of modern NY 51 south of Ilion was state-maintained. In the 1930 renumbering of state highways in New York, the section of NY 44 from West Burlington to West Winfield became part of the new NY 51, which utilized all of its modern routing from Mount Upton to Ilion upon assignment. NY 51 was extended across the Mohawk River to NY 5 in North Ilion in the mid-1960s.