There are
760 mi
from Denton, TX to Marshalltown, IA
That's the driving distance. It would take 13 hours 25 mins to go from Denton, Texas to Marshalltown, Iowa.
The flight distance (direct flight from Denton, TX to Marshalltown, IA) is 652.50 mi.
760 mi = 1,222.31 kms