Of 66 counties in the Mount Rushmore State, Day County ranks 28th in terms of size (1,091 square miles). Day County is in Glacial Lakes & Prairies South Dakota. There is approximately 1,000 acres of ranches for sale in Day County, South Dakota, 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 roughly $400,000. Browse all Day County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Day County is homesite.