There are
2,118 mi
from San Marcos, CA to Shelbyville, IN
That's the driving distance. It would take 1 day 13 hours to go from San Marcos, California to Shelbyville, Indiana.
The flight distance (direct flight from San Marcos, CA to Shelbyville, IN) is 1,791.99 mi.
2,118 mi = 3.22 kms