Nanuet is a hamlet and census-designated place in the town of Clarkstown, Rockland County, New York, United States. It is located north of Pearl River, south of New City, east of Spring Valley, and west of West Nyack. It is located midway between Manhattan and Bear Mountain, north and south of each respectively; and north of the New Jersey border. It has one of three Rockland County stations on New Jersey Transit's Pascack Valley Line. The population of Nanuet was 17,882 at the 2010 census.