There are 6 US Post Offices in Wilson County serving a total of 119,283 residents equating to 19,881 residents per post office. It's estimated that approximately 190,389 packages are handled across the 6 county post offices annually. Wilson County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 113,993. Its county seat is Lebanon. The largest city in the county is Mt. Juliet. Wilson County is part of the Nashville-Davidson\u2013Murfreesboro\u2013Franklin, TN Metropolitan Statistical Area."