A total of nearly 4,000 acres were listed for sale in New York's Jefferson County recently, representing a total value of approximately $97 million in Jefferson County farms and rural land for sale. Jefferson County ranks 21st in the Empire State for the total number of acres of land currently advertised for sale. Of all locations in Jefferson County with farms and rural land for sale, Watertown featured the most land for sale. Jefferson County is one of the ten biggest counties in New York (1,857 square miles). It's located in the Northern New York region of New York.