Port Ewen is a hamlet in Ulster County, New York, United States. The population was 3,678 at the 2020 census. Port Ewen is in the Town of Esopus, south of Kingston, along U.S. Route 9W. Port Ewen is bounded by the Rondout Creek to the north, the Hudson River to the east, the hamlets of Connelly and Sleightsburgh to the northwest and northeast, respectively, the hamlet of Ulster Park to the south, and New Salem to the west.