The total value of land for sale in Roberts County recently on Land.com was almost $10 million. This represents around 1,000 acres of land for sale in Roberts County. Roberts County ranks 15th out of 66 counties in South Dakota for the total acreage of land currently advertised for sale. Big Stone City had the most land for sale. Agriculture and farming drives the Roberts County economy, with 876 farms recorded in the county during the U.S. Census in 2012. Farming activities in Roberts County generate annual revenues of $16 million, most of which is from crops. Roberts County is South Dakota's 27th biggest county (1,135 square miles). It's located in the Glacial Lakes & Prairies South Dakota region of the state.