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is a hamlet ( and census-designated place ) in Suffolk County, New York, United States. The population was 4,550 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 5.6 square miles (14.5 km²), of which, 5.4 square miles (14.1 km²) of it is land and 0.2 square miles (0.4 km²) of it (2.68%) is water. East Moriches has an elementary school, recently built, as well as a middle school. Once a student is in 8th grade, they may chose between three high schools; Westhampton Beach, Center Moriches, and Eastport South Manor. In 2006 the school budget failed, and the school was put on to austerity budget, or a budget controlled by the state. The East Moriches Booster club raised enough money to give the school sports teams and clubs. East Moriches is also commonly referred to as EMO by the locals.