There are 13 US Post Offices in Carroll County serving a total of 31,768 residents equating to 2,444 residents per post office. It's estimated that approximately 50,705 packages are handled across the 13 county post offices annually. Carroll County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 28,522. Its county seat is Huntingdon. The county was named for Governor William Carroll."