There are
510 mi
from Rockville, MD to Grosse Pointe Park, MI
That's the driving distance. It would take 9 hours 40 mins to go from Rockville, Maryland to Grosse Pointe Park, Michigan.
The flight distance (direct flight from Rockville, MD to Grosse Pointe Park, MI) is 378.62 mi.
510 mi = 821.37 kms