State Route 9 is a west-to-east highway in the U.S. state of Tennessee that is 117 miles (189 km) long. It begins in Campbell County and ends in Cocke County. State Route 9 is little-known by the general public by this designation as it is overlain by U.S. Route 25W and U.S. Route 25 east of Newport; the "9" designation is seen on mileposts.