There are 7 US Post Offices in Blount County serving a total of 59,957 residents equating to 8,565 residents per post office. It's estimated that approximately 95,698 packages are handled across the 7 county post offices annually. Blount County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 123,010. It had an estimated population of 126,339 in 2014. The county seat is Maryville, which is also the county's largest city. Blount County is included in the Knoxville, TN Metropolitan Statistical Area."