The Incorporated Village of Westbury is a village in the Town of North Hempstead in Nassau County, on Long Island, in New York, United States. It is located about 18 miles east of Manhattan. The population was 15,404 at the 2020 census. Some iconic places: Old Westbury Gardens, Adventureland Amusement Park, Queens County Farm Museum, Sagamore Hill National Historic Site, Cradle of Aviation Museum, Nassau County Museum of Art, Planting Fields Arboretum State Historic Park, Long Island Children's Museum