Gov. Thomas Johnson Middle School 1799 Schifferstadt Blvd., Frederick, MD 21701 ADC Map (Frederick Cnty.) Map 29 H-2 From 270 N changes to Rt 15 at city limits, follow to Rt 26, Walkersville exit and turn right at first light. Take a right at the next intersection to traffic light at Schifferstadt Blvd. Turn left (you can see the school from the light). Take the SECOND parking lot entrance.