Spring Valley is a village in the town of Ramapo and Clarkstown in Rockland County, New York, United States. It is located north of Chestnut Ridge, east of Airmont and Monsey, south of Hillcrest, and west of Nanuet. The population was 33,066 at the 2020 census, making it the second most populous community in both Clarkstown and Rockland County, after New City.