There are
999 mi
from Pasadena, TX to Marshalltown, IA
That's the driving distance. It would take 18 hours 24 mins to go from Pasadena, Texas to Marshalltown, Iowa.
The flight distance (direct flight from Pasadena, TX to Marshalltown, IA) is 863.45 mi.
999 mi = 1,607.54 kms