There are
2,612 mi
from Rockville, MD to Rosemead, CA
That's the driving distance. It would take 1 day 22 hours to go from Rockville, Maryland to Rosemead, California.
The flight distance (direct flight from Rockville, MD to Rosemead, CA) is 2,277.12 mi.
2,612 mi = 4,203.55 kms