There was a total of approximately $10 million of farms, ranches, hunting land and other land for sale in Sully County recently on Land.com. The total size of all Sully County land and rural real estate for sale was 1,000 acres. Sully County ranks 33rd out of 66 counties in the state for the total number of acres of land currently advertised for sale. Pierre featured the most land for sale. Agriculture and farming drives the Sully County economy, with 191 farms recorded in the county during the U.S. Census in 2012. Farming activities in Sully County generate annual revenues of $7 million, most of which is from crops. Sully County is South Dakota's 29th largest county (1,070 square miles). It's located in the Great Lakes South Dakota region of the state.