There are
237 mi
from Gaithersburg, MD to Hackensack, NJ
That's the driving distance. It would take 4 hours 49 mins to go from Gaithersburg, Maryland to Hackensack, New Jersey.
The flight distance (direct flight from Gaithersburg, MD to Hackensack, NJ) is 205.94 mi.
237 mi = 380.69 kms