Parishville is the primary hamlet and a census-designated place in the town of Parishville in St. Lawrence County, New York, United States. As of the 2010 census, it had a population of 647, out of 2,153 in the entire town of Parishville. The community is in eastern St. Lawrence County, on the eastern side of the town of Parishville. The eastern edge of the CDP is the town border with Hopkinton.