Milton, Georgia is just outside of MARTA’s service area in the north Atlanta suburbs. The closest bus stop is at the Windward Parkway Park and Ride lot just off Ga. 400. Buses 140 and 143 connect with the lot and both travel to the North Springs MARTA station on the red line (bus 143 is a shorter commute).
If you ride the bus, it is free to transfer between buses and trains if you have a Breeze card. For the last leg of the trip, request an Uber or Lyft car from North Springs or the park and ride lot.