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is a hamlet (and census-designated place) in Nassau County, New York, USA.
As of the 2000 census, the CDP population was 22,764. The name
is taken from "Meroke", the name (meaning peaceful) of the Algonquin tribe formerly indigenous to the area. It is served by the Merrick station on the Long Island Rail Road.
According to the United States Census Bureau, the CDP has a total area of 5.2 square miles (13.4 km²), of which, 4.2 square miles (10.9 km²) of it is land and 1.0 square miles (2.6 km²) of it (19.27%) is water.