Day County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the Coyote State, Day County ranks 28th in terms of size (698,299 acres). South Dakota's Day County has around 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of land for sale here was almost $11 million. The average price of residential land for sale in Day County was $1 million. The economy here is mainly agricultural. 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.