There are
506 mi
from Clarksville, TN to Amherst, OH
That's the driving distance. It would take 10 hours 9 mins to go from Clarksville, Tennessee to Amherst, Ohio.
The flight distance (direct flight from Clarksville, TN to Amherst, OH) is 434.90 mi.
506 mi = 813.79 kms