Land for sale in Roberts County, South Dakota, recently totaled around $10 million and almost 1,000 acres. Roberts County ranks 17th out of 66 counties in South Dakota for the total number of acres of land currently advertised for sale. Among cities in Roberts County with land for sale, Big Stone City featured the most land for sale. Its economy is defined as agricultural, with 876 farms recorded in the county during the most recent U.S. Census. Farming activities in Roberts County generate annual revenues of $16 million, most of which is from crops. Roberts County is the 27th biggest county (1,135 square miles) in South Dakota. It's located in the Glacial Lakes & Prairies South Dakota region of South Dakota.