There are
2,764 mi
from Gaithersburg, MD to Troutdale, OR
That's the driving distance. It would take 2 days to go from Gaithersburg, Maryland to Troutdale, Oregon.
The flight distance (direct flight from Gaithersburg, MD to Troutdale, OR) is 2,317.94 mi.
2,764 mi = 4,448.31 kms