There are 7 US Post Offices in Platte County serving a total of 32,881 residents equating to 4,697 residents per post office. It's estimated that approximately 52,482 packages are handled across the 7 county post offices annually. Platte County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 32,237. Its county seat is Columbus. The county was created in 1855. Platte County comprises the Columbus, NE Micropolitan Statistical Area. In the Nebraska license plate system, Platte County is represented by the prefix 10 (it had the 10th-largest number of vehicles registered in the county when the license plate system was established in 1922)."