There are
255 mi
from Waterloo, IA to Maryville, MO
That's the driving distance. It would take 5 hours 29 mins to go from Waterloo, Iowa to Maryville, Missouri.
The flight distance (direct flight from Waterloo, IA to Maryville, MO) is 197.91 mi.
255 mi = 409.82 kms