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1 day ago · 42°29′ N to 45°56′ N. Longitude. 96°26′ W to 104°03′ W. Website. sd .gov. South Dakota ( / dəˈkoʊtə / ⓘ də-KOH-tə; [8] Sioux: Dakȟóta itókaga, pronounced [daˈkˣota iˈtokaga]) is a landlocked state in the North Central region of the United States. It is also part of the Great Plains.