Westbury is an affluent village in Nassau County, New York, United States. The population was 15,404 at the 2020 census. The Incorporated Village of Westbury is in the Town of North Hempstead. It is located about 18 miles (29 km) east of Manhattan.
The first settlers arrived in 1658 in the region known as the Hempstead Plains. Many of the early settlers were Quakers.
Westbury's Jericho Turnpike, which provides connection to Mineola and Syosset as well as to the Long Island Expressway (or LIE), was once a trail used by the Massapequa Indians. As far back as the 17th century, it served as a divider between the early homesteads north of the Turnpike and the Great Plains to its south. Today, it serves as a state highway complex.
In 1657, Captain John Seaman purchased 12,000 acres (49 km2) from the Algonquian Tribe of the Massapequa Indians.