Sioux -- U.S. County in North Dakota Population (2000): 4044 Housing Units (2000): 1216 Land area (2000): 1094.120067 sq. miles (2833.757845 sq. km) Water area (2000): 34.178616 sq. miles (88.522205 sq. km) Total area (2000): 1128.298683 sq. miles (2922.280050 sq. km) Located within: North Dakota (ND), FIPS 38 Location: 46.135844 N, 100.867173 W Headwords: Sioux Sioux, ND Sioux County Sioux County, ND