There are
664 mi
from San Mateo, CA to Gresham, OR
That's the driving distance. It would take 12 hours 55 mins to go from San Mateo, California to Gresham, Oregon.
The flight distance (direct flight from San Mateo, CA to Gresham, OR) is 548.43 mi.
664 mi = 1,069.29 kms