There are 3 US Post Offices in Valley County serving a total of 4,112 residents equating to 1,371 residents per post office. It's estimated that approximately 6,563 packages are handled across the 3 county post offices annually. Valley County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 4,260. Its county seat is Ord. In the Nebraska license plate system, Valley County is represented by the prefix 47 (it had the forty-seventh-largest number of vehicles registered in the county when the license plate system was established in 1922)."