Sanborn County ranks 59th in the Coyote State for the total acreage of land currently advertised for sale. Of all locations in Sanborn County with farms, ranches, hunting land and other land for sale, Letcher featured 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 largest county (570 square miles) in South Dakota. It's located in the Glacial Lakes & Prairies South Dakota region of South Dakota.