There are 8 US Post Offices in Polk County serving a total of 16,590 residents equating to 2,074 residents per post office. It's estimated that approximately 26,479 packages are handled across the 8 county post offices annually. Polk County is a county located in the southeastern corner of the U.S. state of Tennessee. As of the 2010 census, the population was 16,825. Its county seat is Benton. The county was created November 28, 1839 from parts of Bradley and McMinn counties. The county was named after then-governor (and future president) James K. Polk. Polk County is included in the Cleveland, TN Metropolitan Statistical Area, which is also included in the Chattanooga-Cleveland-Dalton, TN-GA-AL Combined Statistical Area."