 Its headquarters is in Durant, and its capitol building, now a museum, is in Tuskahoma.The Chickasaw Nation lies within the region, with the tribal capitol building located at Tishomingo and its headquarters in Ada.The Chickasaw Nation, which runs , promotes the idea of Chickasaw Country as the 13 south-central Oklahoma counties that comprise the Chickasaw Nation, being the Tourism Department’s seven counties plus Coal, Bryan, Jefferson, Stephens, Grady, and McClain counties.