There are
1,098 mi
from Keansburg, NJ to Marshalltown, IA
That's the driving distance. It would take 20 hours 39 mins to go from Keansburg, New Jersey to Marshalltown, Iowa.
The flight distance (direct flight from Keansburg, NJ to Marshalltown, IA) is 979.84 mi.
1,098 mi = 1,767.57 kms