There are
977 mi
from Nashua, NH to Merrillville, IN
That's the driving distance. It would take 18 hours 34 mins to go from Nashua, New Hampshire to Merrillville, Indiana.
The flight distance (direct flight from Nashua, NH to Merrillville, IN) is 816.62 mi.
977 mi = 1,571.52 kms