Sioux County, Nebraska
Sioux County is a county in the U.S. state of Nebraska. As of the 2020 United States Census, the population was 1,135. Its county seat is Harrison. Sioux County is included in the Scottsbluff, NE Micropolitan Statistical Area. In the Nebraska license plate system, Sioux County is represented by the prefix 80 (it had the 80th-largest number of vehicles registered in the state when the license plate system was established in 1922). Geography Sioux County lies at the NW corner of Nebraska. Its north boundary line abuts the south line of the state of South Dakota and its west boundary line abuts the east boundary line of the state of Wyoming. The Niobrara River flows southeastward and eastward through the upper central part of the county. The county terrain is arid low rolling hills, sloping to the east and southeast. The terrain is sparsely utilized for agriculture, with some center pivot irrigation used. The county has an area of , of which is land and (0.03%) is water. Major highways Protected areas Agate Fossil Beds National Monument Fort Robinson State Park (part) Gilbert-Baker Wildlife Area Nebraska National Forest (part) Peterson State Wildlife Area Soldier Creek Wilderness Oglala National Grassland (part)