There are 8 US Post Offices in Otoe County serving a total of 14,726 residents equating to 1,841 residents per post office. It's estimated that approximately 23,504 packages are handled across the 8 county post offices annually. Otoe County is a county located in the U.S. state of Nebraska. As of the 2010 census, the population was 15,740. Its county seat is Nebraska City. The county was formed in 1854 and named after the Otoe Indian tribe. In the Nebraska license plate system, Otoe County is represented by the prefix 11 (it had the eleventh-largest number of vehicles registered in the county when the license plate system was established in 1922)."