 New York State Route 66 | ||||
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 Map of eastern New York with NY 66 highlighted in red | ||||
| Route information | ||||
| Maintained by NYSDOT and the city of Troy | ||||
| Length | 46.30 mi[1] (74.51 km) | |||
| Existed | mid-1920s[2][3]–present | |||
| Major junctions | ||||
| South end |   US 9 / NY 23B in Hudson | |||
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| North end |  NY 2 in Troy | |||
| Location | ||||
| Country | United States | |||
| State | New York | |||
| Counties | Columbia, Rensselaer | |||
| Highway system | ||||
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New York State Route 66 (NY 66) is a state highway in the Capital District of New York in the United States. The route begins at an intersection with US 9 and NY 23B in the Columbia County city of Hudson and ends at a junction with NY 2 in the Rensselaer County city of Troy. While both Hudson and Troy are located on the Hudson River, NY 66 follows a more inland routing between the two locations to serve several rural villages and hamlets, including Chatham and Sand Lake. NY 66 overlaps with U.S. Route 20 (US 20) and NY 43, two regionally important east–west highways, in Nassau and Sand Lake, respectively.
The route was assigned in the mid-1920s to an alignment extending from Claverack to Nassau via Ghent. It was extended north to Troy as part of the 1930 renumbering of state highways in New York and rerouted south of Ghent to serve Hudson c. 1933. Originally, NY 66 directly served Averill Park via modern County Route 45 (CR 45) and part of NY 43; however, it was realigned in 1980 to bypass the hamlet to the northeast. The segment of NY 66 between Sand Lake and US 20 was part of Route 21, an unsigned legislative route, in the early 1920s.