Day County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the state, 698,299-acre Day County ranks 28th by size. The total value of about 1,000 acres of residential land and property recently listed for sale in South Dakota's Day County was about $10 million. The average price of residential land for sale in Day 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.