Greenvale (historically known as Bull's Head, Cedar Swamp, and North Roslyn) is a hamlet and census-designated place (CDP) in the towns of North Hempstead and Oyster Bay in Nassau County, on the North Shore of Long Island, in New York, United States. It is considered part of the Greater Roslyn area, which is anchored by the Incorporated Village of Roslyn. The population was 1,069 at the time of the 2020 census.

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