Take I-84 West to Exit 17 in Middlebury. Exit becomes Route 64. Follow 64 to its end in Woodbury at a traffic light. Turn right onto Route 6. Go straight through one more traffic light. Then take your 3rd left which is School Street. Mitchell School is at the top of the rise on the right.
from Danbury Area
Take I-84 East to Exit 15 in Southbury. Turn left at end of exit onto Route 67. Follow straight -- turns into Route 6. Follow 6 into Woodbury. Go straight through two traffic lights. Then take your 3rd left which is School Street. Mitchell School is at the top of the rise on the right.