There are
464 mi
from Gaithersburg, MD to Haverhill, MA
That's the driving distance. It would take 9 hours 34 mins to go from Gaithersburg, Maryland to Haverhill, Massachusetts.
The flight distance (direct flight from Gaithersburg, MD to Haverhill, MA) is 406.14 mi.
464 mi = 746.38 kms