Sully County is in Great Lakes South Dakota. Of the 66 counties in the Mount Rushmore State, 1,070-square-mile Sully County ranks 29th by size. The total value of 1,000 acres of recreational land and property recently listed for sale in Sully County, South Dakota, was about $2 million. The average price of recreational property for sale in Sully County was $837,500. The county has a rural, farm-based economy. Browse all recreational property for sale in South Dakota to find the recreational tract that suits your lifestyle needs, from hunting and fishing properties for the outdoor enthusiast to undeveloped acreage ready for future residential-property development.