Brown County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the Coyote State, 1,730-square-mile Brown County ranks 13th by size. The total value of 1,000 acres of residential land recently listed for sale in South Dakota's Brown County was roughly $21 million. The average price of residential acreage for sale in Brown County was $495,007. 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.