There are
2,408 mi
from Middletown, OH to Menlo Park, CA
That's the driving distance. It would take 1 day 18 hours to go from Middletown, Ohio to Menlo Park, California.
The flight distance (direct flight from Middletown, OH to Menlo Park, CA) is 2,033.49 mi.
2,408 mi = 3,874.68 kms