Of 66 counties in the Coyote State, Gregory County ranks 30th by size (1,053 square miles). Gregory County is in Great Lakes South Dakota. There is about 1,000 acres of riverfront property for sale in South Dakota's Gregory County based on recent Land Network data. The combined market value of ranches, farms, hunting land and other rural land and acreage for sale here is roughly $4 million. 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! The most common type of land for sale by combined acreage in Gregory County is hunting land.