Gardnertown is a hamlet in Orange County, New York, United States. The population was 4,542 at the 2020 census. It is part of the Poughkeepsie–Newburgh–Middletown, NY Metropolitan Statistical Area as well as the larger New York–Newark–Bridgeport, NY-NJ-CT-PA Combined Statistical Area. Gardnertown is located within the town of Newburgh, and is approximately two miles northwest of the city of Newburgh, a completely separate municipality.