There are
2,080 mi
from San Marcos, CA to Greendale, WI
That's the driving distance. It would take 1 day 12 hours to go from San Marcos, California to Greendale, Wisconsin.
The flight distance (direct flight from San Marcos, CA to Greendale, WI) is 1,714.45 mi.
2,080 mi = 3.22 kms