Route 64 is one of the original 1922 state highways and originally ran between Preston and Collins. It would eventually be moved further to the south with its older alignment becoming U.S. Route 54. It would also be extended east.
Route 64A is a 1.5-mile-long (2.4 km) spur off Route 64 which ends in Bennett Spring State Park. When Route 64 was on its old alignment, another Route 64A went north to the Benton/Hickory county line and is now part of Route 83.