Harding County ranks 51st out of 66 counties in the Mount Rushmore State for the total number of acres of land currently advertised for sale. Of all locations in Harding County with farms and ranches for sale, Ludlow had the most land for sale. Agriculture and farming drives the Harding County economy, with 250 farms recorded in the county during the U.S. Census in 2012. Farming activities in Harding County generate annual revenues of $3 million, the majority of which comes from livestock products. Harding County is one of the ten biggest counties in South Dakota (2,678 square miles). It's located in the Black Hills & Badlands South Dakota region of South Dakota.