Of 66 counties in the state, Brown County ranks 13th in terms of size (1,730 square miles). Brown County is in Glacial Lakes & Prairies South Dakota. There is nearly 1,000 acres of ranches for sale in South Dakota's Brown County based on recent Land Network data. The combined market value of land and rural real estate for sale here is almost $2 million. 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 undeveloped land.