Sioux -- U.S. County in Nebraska Population (2000): 1475 Housing Units (2000): 780 Land area (2000): 2066.588747 sq. miles (5352.440055 sq. km) Water area (2000): 0.727944 sq. miles (1.885367 sq. km) Total area (2000): 2067.316691 sq. miles (5354.325422 sq. km) Located within: Nebraska (NE), FIPS 31 Location: 42.432082 N, 103.792840 W Headwords: Sioux Sioux, NE Sioux County Sioux County, NE