Nanuet is a hamlet and census-designated place in the town of Clarkstown, New York, United States. The third largest hamlet in Clarkstown, 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, 19 miles (31 km) north and south of each respectively; and 2 miles (3 km) north of the New Jersey border. It has one of three Rockland County stations on New Jersey Transit's Pascack Valley Line. As of the 2020 census, Nanuet had a population of 18,886.