There are
2,181 mi
from San Mateo, CA to Greenfield, WI
That's the driving distance. It would take 1 day 13 hours to go from San Mateo, California to Greenfield, Wisconsin.
The flight distance (direct flight from San Mateo, CA to Greenfield, WI) is 1,833.86 mi.
2,181 mi = 3.22 kms