There are
2,773 mi
from Redwood City, CA to Hagerstown, MD
That's the driving distance. It would take 2 days to go from Redwood City, California to Hagerstown, Maryland.
The flight distance (direct flight from Redwood City, CA to Hagerstown, MD) is 2,384.91 mi.
2,773 mi = 4,462.39 kms