Sanborn County ranks 61st in the state for the combined amount of land currently advertised for sale. Of all locations in Sanborn County with farms, ranches, and rural real estate for sale, Letcher had the most land for sale. Its economy is defined as agricultural, with 402 farms recorded in the county during the most recent U.S. Census. Farming activities in Sanborn County generate annual revenues of $12 million, most of which is from crops. Sanborn County is the 56th biggest county (570 square miles) in South Dakota. It's located in the Glacial Lakes & Prairies South Dakota region of the state.