There are
682 mi
from Lawton, OK to Marshalltown, IA
That's the driving distance. It would take 12 hours 5 mins to go from Lawton, Oklahoma to Marshalltown, Iowa.
The flight distance (direct flight from Lawton, OK to Marshalltown, IA) is 593.94 mi.
682 mi = 1,096.96 kms