Of 66 counties in the Mount Rushmore State, Brown County ranks 13th by size (1,730 square miles). Brown County is in Glacial Lakes & Prairies South Dakota. Recent listings of ranches for sale in Brown County, South Dakota, totals about 1,000 acres and a combined market value of nearly $2 million. The most common type of land for sale by combined acreage in Brown County is homesite. Browse all Brown 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 Brown County is homesite.