There was a total of around $10 million of land for sale in South Dakota's Sully County recently on Land.com. The total size of all Sully County farms, ranches, hunting land and other land for sale was almost 1,000 acres. Sully County ranks 40th in the Coyote State for the combined amount of land currently advertised for sale. Pierre had the most land for sale. Sully County has a large agricultural economy, with 191 farms recorded in the county during the latest U.S. Census. Farming activities in Sully County generate annual revenues of $7 million, most of which is from crops. Sully County is South Dakota's 29th biggest county (1,070 square miles). It's located in the Great Lakes South Dakota region of South Dakota.