Haakon (HAW-kin), county (1,827 sq mi/4,732 sq km; 1990 pop. 2,624), central S.Dak.; Philip; 44°17'N 101°31'W. Agr. and cattle-raising region drained in S by Bad R. and in N by Plum Creek; bounded N by Cheyenne R. Wheat; ranching; cattle, poultry. Cheyenne River Indian Reservation to N in Ziebach co. Formed 1914.
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