There are
322 mi
from Waterloo, IA to Allouez, WI
That's the driving distance. It would take 6 hours 26 mins to go from Waterloo, Iowa to Allouez, Wisconsin.
The flight distance (direct flight from Waterloo, IA to Allouez, WI) is 256.56 mi.
322 mi = 517.98 kms