Brewerton is a census-designated place (CDP) in the town of Cicero in Onondaga County and the town of Hastings in Oswego County in the U.S. state of New York. It lies at the west end of Oneida Lake at its outlet into the Oneida River. The population was 4,549 at the 2020 census. Maps of the 19th century indicate that this area was once known as Fort Brewerton, while Brewerton meant the Cicero portion.