There are 5 US Post Offices in Loudon County serving a total of 59,948 residents equating to 11,990 residents per post office. It's estimated that approximately 95,684 packages are handled across the 5 county post offices annually. Loudon County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 48,556. Its county seat is Loudon. Loudon County is included in the Knoxville, TN Metropolitan Statistical Area."