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 on November 28, 1839, from parts of Bradley and McMinn counties. The county was named after then-governor (and future president) James K. Polk. According to the U.S. Census Bureau, the county has a total area of, of which is land and (1.7%) is water. The total area is 1.65% water. Located in the extreme southeastern corner of Tennessee, it is the state’s only county to share borders with both Georgia and North Carolina.