There are
1,777 mi
from Seattle, WA to Marshalltown, IA
That's the driving distance. It would take 1 day 7 hours to go from Seattle, Washington to Marshalltown, Iowa.
The flight distance (direct flight from Seattle, WA to Marshalltown, IA) is 1,482.23 mi.
1,777 mi = 1.61 kms