There are 8 US Post Offices in Franklin County serving a total of 26,814 residents equating to 3,352 residents per post office. It's estimated that approximately 42,798 packages are handled across the 8 county post offices annually. Franklin County (county code FR) is a county located in the eastern portion of the U.S. state of Kansas. As of the 2010 census, the county population was 25,992. Its county seat and most populous city is Ottawa."