There are 5 US Post Offices in Stewart County serving a total of 13,845 residents equating to 2,769 residents per post office. It's estimated that approximately 22,098 packages are handled across the 5 county post offices annually. Stewart County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 13,324. Its county seat is Dover. Stewart County is home to Fort Donelson, the site of a Confederate stand against the Union's push up the Cumberland River during the Civil War."