Banner County is a county in the western part of the U.S. state of Nebraska in the Great Plains region of the United States. As of the 2020 United States Census, its population was 674. Its county seat is the unincorporated community of Harrisburg; there are no incorporated municipalities within the county. In the Nebraska license plate system, Banner County is represented by the prefix 85. Banner County is part of the Scottsbluff, NE Micropolitan Statistical Area.