There are
256 mi
from Overland Park, KS to Marshalltown, IA
That's the driving distance. It would take 4 hours 54 mins to go from Overland Park, Kansas to Marshalltown, Iowa.
The flight distance (direct flight from Overland Park, KS to Marshalltown, IA) is 231.26 mi.
256 mi = 412.25 kms