Offering a mix of rural-residential properties and recreational land for hunting and other uses, Sullivan County is located amidst New York's scenic Catskills Mountains.? The value of all land and rural real estate for sale in Sullivan County, New York, recently was nearly $336 million, representing a combined 11,722 acres of land for sale in Sullivan County. Sullivan County ranks fifth out of 62 counties in the Empire State for the combined amount of land currently advertised for sale. There were two properties listed as sold in Sullivan County through the Land Network Comparable Sales Program. This represented a total value of $807,500. Of all land and rural real estate for sale in Sullivan County, Monticello had the most land for sale. Based on its natural assets, tourism and recreation contribute significant revenue toward Sullivan County's overall GDP. Sullivan County is New York's 23rd biggest county (996 square miles). It's located in the Southern New York region of New York.