Merrick is a hamlet (and census-designated place) in the Town of Hempstead in Nassau County, New York, USA. As of the 2000 census, the CDP population was 22,764. The name Merrick is taken from "Meroke", the name (meaning peaceful) of the Algonquian 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.
As of the census of 2000, there were 22,764 people, 7,524 households, and 6,478 families residing in the CDP. The population density was 5,423.3 per square mile (2,092.7/km²). There were 7,602 housing units at an average density of 1,811.1/sq mi (698.8/km²). The racial makeup of the CDP was 95.2% White, 0.6% African American, 0.10% Native American, 2.24% Asian, 0.01% Pacific Islander, 0.94% from other races, and 0.98% from two or more races. Hispanic or Latino of any race were 5.70% of the population.