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Tishomingo County is a county located in the U.S. state of Mississippi. As of 2010 the population was 19,593. Its county seat is Iuka.
Tishomingo County was organized February 9, 1836, from Chickasaw lands that were ceded to the United States. In 1870 this land was divided into Alcorn, Prentiss and Tishomingo counties.Tishomingo was referenced in the Coen Brother's film, O Brother, Where Art Thou?. Tishomingo County is the only county in Mississippi with natural limestone formations.