 U.S. Route 1 | ||||
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 US 1 highlighted in red | ||||
| Route information | ||||
| Maintained by NYSDOT, PANYNJ, NYCDOT, and the cities of New Rochelle and Rye | ||||
| Length | 21.54 mi[1] (34.67 km) | |||
| Existed | 1926–present | |||
| Major junctions | ||||
| South end |    I-95 / US 1-9 / US 46 at the New Jersey state line in Washington Heights | |||
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| North end |  US 1 in Greenwich, CT | |||
| Location | ||||
| Country | United States | |||
| State | New York | |||
| Counties | New York, Bronx, Westchester | |||
| Highway system | ||||
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U.S. Route 1 (US 1) is a part of the U.S. Highway System that extends from Key West, Florida, to the Canada–United States border at Fort Kent, Maine. In the U.S. state of New York, US 1 extends 21.54 miles (34.67 km) from the George Washington Bridge in Manhattan to the Connecticut state line at Port Chester. It closely parallels Interstate 95 (I-95) for much of its course and does not serve as a major trunk road within the state. It is not concurrent with any other highways besides I-95 and (briefly) US 9, and few other state highways intersect it.
It travels through a variety of different terrain within the city and Westchester County, from the Cross Bronx Expressway to several important surface roads in the northwestern Bronx and then the main street of the Westchester suburbs along Long Island Sound. In many of the latter communities, it begins to intermittently follow the route of the historic Boston Post Road and often still carries that name.
US 1 was designated as part of the 1926 establishment of the U.S. Highway System. It was first signed in New York in 1927, replacing New York State Route 1 (NY 1), a route assigned three years earlier as part of the creation of the modern New York state route system.