Moriches moh-RITCH-iz) is a hamlet and census-designated place in Suffolk County, New York, United States. The population was 2,838 at the 2010 census.Moriches is served by the William Floyd School District.The name "Moriches" comes from Meritces, a Native American who owned land on Moriches Neck.One of the community's most famous businesses/landmarks was the Jurgielewicz Duck Farm founded in 1919 on the edge of the Forge River. At its peak the 65-acre farm located on the edge of the Montauk Branch of the Long Island Rail Road claimed to be America's largest free-range duck operation, raising 1 million Pekin ducks a year. In 2011, it declared bankruptcy, and it closed in August 2011.