There are
2,123 mi
from San Marcos, CA to Jeffersontown, KY
That's the driving distance. It would take 1 day 13 hours to go from San Marcos, California to Jeffersontown, Kentucky.
The flight distance (direct flight from San Marcos, CA to Jeffersontown, KY) is 1,798.76 mi.
2,123 mi = 3.22 kms