There are 7 US Post Offices in Franklin County serving a total of 3,226 residents equating to 461 residents per post office. It's estimated that approximately 5,149 packages are handled across the 7 county post offices annually. Franklin County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 3,225. Its county seat is Franklin. The county was formed in 1867 and organized in 1871. It was named after Benjamin Franklin. In the Nebraska license plate system, Franklin County is represented by the prefix 50 (it had the fiftieth-largest number of vehicles registered in the county when the license plate system was established in 1922)."