High Quality Content by WIKIPEDIA articles! Merrick is a hamlet (and census-designated place) in the Town of Hempstead in Nassau County, New York, USA. As of the 2010 census, the CDP population was 22,097. 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.