There are
347 mi
from Gaithersburg, MD to Parma Heights, OH
That's the driving distance. It would take 6 hours 36 mins to go from Gaithersburg, Maryland to Parma Heights, Ohio.
The flight distance (direct flight from Gaithersburg, MD to Parma Heights, OH) is 286.03 mi.
347 mi = 558.76 kms