There are 6 US Post Offices in Wayne County serving a total of 17,442 residents equating to 2,907 residents per post office. It's estimated that approximately 27,839 packages are handled across the 6 county post offices annually. Wayne County is a county located in Tennessee. As of the 2010 census, the population was 17,021. Its county seat is Waynesboro. The county is named after General \"Mad Anthony\" Wayne."