If you'd like a glossary of bars in Atlanta that are reasonably accessible via MARTA train, there's a map for that. Local planner and engineer Sinan Sinharoy has identified watering holes across the city that are within a half-mile radius of nearby MARTA stations.
Which stop is a thirsty Atlantan's best bet for a night of bar hopping? The Decatur, Midtown and Arts Center stations appear to offer the highest volumes of nearby haunts. But don't sleep on the Downtown station: It has several close options, and once the Atlanta Streetcar is up and running, there will be access to the Edgewood Avenue entertainment district too.