Nanuet is a hamlet and census-designated place in the town of Clarkstown, Rockland County, 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. The population of Nanuet was 17,882 at the 2010 census.

Clarkstown is a town in Rockland County, New York, United States. The town is on the eastern border of the county, located north of the town of Orangetown, east of the town of Ramapo, south of the town of Haverstraw, and west of the Hudson River. As of the 2020 census, the town had a total population of 86,855. The hamlet of New City, the county seat of Rockland County, is also the seat of town government and of the Clarkstown Police Department, the county sheriff's office, and the county correctional facility. New City makes up about 41.47% of the town's population.