Gregory County is in Great Lakes South Dakota. Of the 66 counties in the Coyote State, Gregory County is 30th in terms of its size (1,053 square miles). Gregory County, South Dakota, has approximately 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of ranches, farms, hunting land and other rural land and acreage for sale here was $2 million. The average price of residential land for sale in Gregory County was $1 million. 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.