There are
1,926 mi
from Columbia, MO to Milwaukie, OR
That's the driving distance. It would take 1 day 9 hours to go from Columbia, Missouri to Milwaukie, Oregon.
The flight distance (direct flight from Columbia, MO to Milwaukie, OR) is 1,604.05 mi.
1,926 mi = 1.61 kms