There are
2,068 mi
from San Marcos, CA to Marshfield, WI
That's the driving distance. It would take 1 day 12 hours to go from San Marcos, California to Marshfield, Wisconsin.
The flight distance (direct flight from San Marcos, CA to Marshfield, WI) is 1,644.41 mi.
2,068 mi = 3.22 kms