Roslyn is a village in Nassau County, New York, on the North Shore of Long Island. As of the2010 Census, the village population was 2,770. Initially Roslyn was settled in the year 1633. Roslyn was once called Hempstead Harbor, but its name changed to Roslyn on September 7, 1844 due to postal confusion regarding all the other "Hempsteads" scattered about Long Island.The Village of Roslyn is at the eastern edge of the Town of North Hempstead. 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.