 New York State Route 366 | ||||
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 Map of Tompkins County in central New York with NY 366 highlighted in red | ||||
| Route information | ||||
| Maintained by NYSDOT and the city of Ithaca | ||||
| Length | 9.38 mi[1] (15.10 km) | |||
| Existed | 1930[2]–present | |||
| Major junctions | ||||
| West end |  NY 79 in Ithaca | |||
| East end |  NY 38 in Freevile | |||
| Location | ||||
| Country | United States | |||
| State | New York | |||
| Counties | Tompkins | |||
| Highway system | ||||
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New York State Route 366 (NY 366) is an east–west state highway located entirely within Tompkins County in the Finger Lakes region of New York in the United States. It runs for 9.40 miles (15.13 km) from State Street (NY 79) just east of downtown Ithaca to NY 38 in Freeville. NY 366 parallels Fall Creek from Varna to Freeville and passes along the southern edge of the Cornell University campus. NY 366 was assigned as part of the 1930 renumbering of state highways in New York; however, it was initially nothing more than a connector between NY 13 in Etna and NY 38 in Freeville. In the 1960s, NY 13 was moved onto a new expressway bypassing Ithaca to the west and north. The former surface routing of NY 13 into downtown Ithaca became an extension of NY 366.