There are
2,718 mi
from Gaithersburg, MD to Hanford, CA
That's the driving distance. It would take 2 days to go from Gaithersburg, Maryland to Hanford, California.
The flight distance (direct flight from Gaithersburg, MD to Hanford, CA) is 2,306.32 mi.
2,718 mi = 4,373.67 kms