There are
2,794 mi
from Gresham, OR to Greenbelt, MD
That's the driving distance. It would take 2 days 1 hour to go from Gresham, Oregon to Greenbelt, Maryland.
The flight distance (direct flight from Gresham, OR to Greenbelt, MD) is 2,340.19 mi.
2,794 mi = 3.22 kms