High Quality Content by WIKIPEDIA articles! East Greenwich Township is a township in Gloucester County, New Jersey, United States. As of the United States 2000 Census, the township population was 5,430.East Greenwich Township was created by an Act of the New Jersey Legislature on February 10, 1881, from the eastern part of Greenwich Township and the western part of Mantua Township.East Greenwich includes the unincorporated communities of Clarksboro, Mickleton and Mount Royal.