i have Shadows of north America in front of me, and it has a short section on Atlanta on page 67. not much there.
the neo-anarchists guide to north america has a proper section on Atlanta on pages 35-47, which is probably closer to what your looking for, even if it is a bit dated (2052). there are six sections of town mentioned with security ratings (downtown, buckhead, decatur, douglasville, marietta and norcross)
[edit] also, the neo-anarchists guide has fold-out maps in the back. one of these is a map of downtown Atlanta.