There are 1 US Post Offices in Banner County serving a total of 455 residents equating to 455 residents per post office. It's estimated that approximately 726 packages are handled across the 1 county post offices annually. Banner County is a county in the western part of the state of Nebraska in the Great Plains region of the United States. As of the 2010 census, its population was 690. Its county seat is Harrisburg; there are no incorporated municipalities within the county. Banner County is part of the Scottsbluff, NE Micropolitan Statistical Area."