The value of all farms and rural land for sale in Delaware's Sussex County recently was $481 million, representing a combined 7,694 acres of land for sale in Sussex County. Based on the combined acreage of land and rural property for sale here, Sussex County has the most land for sale of all counties in Delaware. Of all farms, rural land, hunting land and other land for sale in Sussex County, Lewes featured the most land for sale. Sussex County is the largest county in Delaware (1,196 square miles, or some 100 percent of the state's total land area). It's located in the Southern Delaware region of Delaware.