Land for sale in Sully County, South Dakota, recently totaled around $181 million and nearly 100,000 acres. Based on the combined acreage of land and rural property for sale here, Sully County has the most land for sale of all counties in the Coyote State. Among cities in Sully County with land for sale, Pierre featured the most land for sale. Its economy is defined as agricultural, with 191 farms recorded in the county during the most recent 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.