A total of nearly 6,000 acres were listed for sale in Gregory County, South Dakota, recently, representing a total value of around $32 million in Gregory County farms and ranches for sale. Gregory County ranks 25th in South Dakota based on the total amount of acres of land for sale of all the counties in the Mount Rushmore State. Of all ranches, farms, hunting land and other rural land and acreage for sale in Gregory County, Fairfax featured the most land for sale. Agriculture and farming drives the Gregory County economy, with 505 farms recorded in the county during the U.S. Census in 2012. Farming activities in Gregory County generate annual revenues of $14 million, the majority of which comes from livestock products. Gregory County is the 30th biggest county (1,053 square miles) in South Dakota. It's located in the Great Lakes South Dakota region of the state.