Roslyn ( ROZ-lin) is a village in Nassau County, New York, on the North Shore of Long Island. As of the 2010 Census, the population of the village was 2,770. Roslyn was initially settled in the year 1633. Originally, Roslyn was called Hempstead Harbor, but its name was changed to Roslyn on September 7, 1844, due to postal confusion regarding all the other "Hempsteads" scattered about Long Island. The name "Roslyn" was selected as the new name, as its location in a valley reminded officials to that of Roslin, Scotland.
The Village of Roslyn is located near the eastern edge of the Town of North Hempstead, and is at the southern end of Hempstead Harbor.
According to the United States Census Bureau, the village has a total area of 0.6 square miles (1.6 km2), of which, 0.6 square miles (1.6 km2) of it is land and 1.56% is water.
As of the 2010 census the population was 86% White (76% Non-Hispanic White), 2.2% Black or African American, 0.2% Native American, 8.85% Asian, 2.6% from other races, and 2.2% from two or more races. Hispanic or Latino of any race were 11.2% of the population.
As of the census of 2000, there were 2,570 people, 1,060 households, and 603 families residing in the village. The population density was 4,082.2 people per square mile (1,575.1/km2). There were 1,124 housing units at an average density of 1,785.4 per square mile (688.9/km2).