Day County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the Coyote State, Day County is 28th in terms of its size (1,091 square miles). Recent listings of residential land and property for sale in South Dakota's Day County totals almost 1,000 acres and a combined market value of nearly $2 million. The most common type of land for sale by combined acreage in Day County is homesite. The average price of residential land for sale in Day County was $388,675. 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.