There are
1,014 mi
from Allentown, PA to Marshalltown, IA
That's the driving distance. It would take 18 hours 53 mins to go from Allentown, Pennsylvania to Marshalltown, Iowa.
The flight distance (direct flight from Allentown, PA to Marshalltown, IA) is 907.58 mi.
1,014 mi = 1.61 kms