There are
656 mi
from Clarksville, TN to Palatka, FL
That's the driving distance. It would take 12 hours 29 mins to go from Clarksville, Tennessee to Palatka, Florida.
The flight distance (direct flight from Clarksville, TN to Palatka, FL) is 579.17 mi.
656 mi = 1,055.58 kms