Gregory County is in Great Lakes South Dakota. Of the 66 counties in the state, 674,254-acre Gregory County ranks 30th by size. Recent listings of residential land for sale in South Dakota's Gregory County totals 1,000 acres and a combined market value of nearly $2 million. The most common type of land for sale by combined acreage in Gregory County is recreational property. The average price of residential acreage for sale in Gregory County was $745,833. The county has a rural, farm-based economy. Browse all residential land and rural property for sale in South Dakota to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.