MARTA does not directly go to Marietta, but there are several options for commuting there on transit.
MARTA + Uber
Connecting with Uber, a car service that let’s you reach a driver at a touch of a button, is the best way to get to a specific address in Marietta. The Dunwoody, Medical Center, Lindbergh Center and Arts Center stations are all about a 15-minute car trip to Cumberland Mall for example. If you’re coming from the airport, taking any northbound train to the Arts Center MARTA station then requesting a car from there would be the fastest commute to the Cobb Galleria area.
If you are trying to get to downtown Marietta, take a red line MARTA train to the Medical Center MARTA station and connect with Uber there. The car ride is about 22 minutes (15 miles). Use promo code MARTAGuide for $20 your first ride with Uber.
CobbLinc buses also connect with several MARTA stations on a limited schedule (primarily weekdays) and travel to Marietta. It is free to transfer from MARTA to a CobbLinc, but if you are starting your trip in Cobb County, you’ll need to have cash value or a CobbLinc pass on your Breeze Card, available at all Breeze Card vending machines and online.