Roslyn Heights (also known as "The Heights") is a hamlet and census-designated place (CDP) in Nassau County, New York, in the United States. It is considered part of the Greater Roslyn area, which is anchored by the Incorporated Village of Roslyn. The population was 6,577 at the 2010 census.
Roslyn Heights is in the eastern part of the Town of North Hempstead, at exit 37 on the Long Island Expressway (Interstate 495). The Zip Code for Roslyn Heights is 11577.
In the 1950s and 1960s, the area of Roslyn Heights south of the Northern State Parkway known as Roslyn Country Club proposed incorporating itself as a village, citing the desire for home rule the first time in the 1950s and their dissatisfaction with Nassau County's plans to widen Roslyn Road the second time in the 1960s. These proposals were ultimately unsuccessful, and all of Roslyn Heights remains an unincorporated hamlet within and directly governed by the Town of North Hempstead to this day.
In the 20th Century, a major urban renewal project took place in the northeastern part of the hamlet – specifically the area around the Roslyn Long Island Rail Road station known as Roslyn Plaza. The Roslyn Plaza Urban Renewal Project began in the early 1970s and the final phase broke ground in 1983.
This project was carried out by the Town of North Hempstead.
According to the United States Census Bureau, the CDP has a total area of 1.5 square miles (3.9 km2), all of it land.
Although most of Roslyn Heights is served by the Roslyn Union Free School District, portions of the school-aged population are enrolled in the East Williston Union Free school district, the Herricks Union Free School District, as well as the Mineola Union Free School District.
At the 2000 census there were 6,295 people, 2,168 households, and 1,773 families in the CDP. The population density was 4,223.6 per square mile (1,631.2/km2). There were 2,226 housing units at an average density of 1,493.5/sq mi (576.8/km2).