Of 66 counties in the Coyote State, Sully County ranks 29th in terms of size (1,070 square miles). Sully County is in Great Lakes South Dakota. The total value of about 1,000 acres of riverfront homes and property recently listed for sale in Sully County, South Dakota, was nearly $8 million. Browse all waterfront property for sale in Sully County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! By overall acreage, undeveloped land is the most common type of land for sale in Sully County.