Gregory County is in Great Lakes South Dakota. Of the 66 counties in the state, Gregory County ranks 30th in terms of size (674,254 acres). The most common type of land for sale by combined acreage in Gregory County is recreational property. Browse all waterfront property for sale in Gregory 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!