Of 66 counties in the state, Sully County ranks 29th by size (1,070 square miles). Sully County is in Great Lakes South Dakota. Recent listings of riverfront property for sale in South Dakota's Sully County totals around 1,000 acres and a combined market value of about $8 million. By overall acreage, undeveloped land is the most common type of land for sale in Sully County. 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.