There are
2,045 mi
from Rocklin, CA to Merrillville, IN
That's the driving distance. It would take 1 day 11 hours to go from Rocklin, California to Merrillville, Indiana.
The flight distance (direct flight from Rocklin, CA to Merrillville, IN) is 1,788.96 mi.
2,045 mi = 3,291.71 kms