There are 3 US Post Offices in Cannon County serving a total of 11,781 residents equating to 3,927 residents per post office. It's estimated that approximately 18,804 packages are handled across the 3 county post offices annually. Cannon County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 13,801. Its county seat is Woodbury. Cannon County is part of the Nashville-Davidson-Murfreesboro-Franklin, TN Metropolitan Statistical Area."