Day County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the Mount Rushmore State, Day County is 28th in terms of its size (1,091 square miles). There is 1,000 acres of farms for sale in South Dakota's Day County based on recent Land Network data. The combined market value of ranches, farms, hunting land and other rural land and acreage for sale here is about $2 million. The average price of farmland for sale in Day County was $770,000. The county has a rural, farm-based economy. Farms for sale in Day County feature livestock including horses, cattle, goats, pig and sheep. Browse all South Dakota farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future commercial or lifestyle needs.