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 farms and rural land for sale in Sullivan County recently was nearly $377 million, representing a combined 12,372 acres of land for sale in Sullivan County. Sullivan County ranks fifth based on the combined acreage of land for sale of the 62 counties in the Empire State. Among cities in Sullivan County with farms, hunting land and other rural land and acreage for sale, 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 the 23rd largest county (996 square miles) in New York. It's located in the Southern New York region of New York.