There are
323 mi
from Oshkosh, WI to Marshalltown, IA
That's the driving distance. It would take 6 hours 31 mins to go from Oshkosh, Wisconsin to Marshalltown, Iowa.
The flight distance (direct flight from Oshkosh, WI to Marshalltown, IA) is 259.23 mi.
323 mi = 520.25 kms