Yankton County is in Southeast South Dakota. Of the 66 counties in the state, 532-square-mile Yankton County ranks 59th by size. The most common type of land for sale by combined acreage in Yankton County is homesite. Browse all waterfront property for sale in Yankton 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!