Westside in Atlanta may mean:
"Westside" can also mean the entire west side of Atlanta. The name West Midtown is used by the neighbors' association in Home Park, the largest constituent neighborhood, and by the West Midtown Business Association.
"Westside" referring to West Midtown only, is used by Not for Tourists and Westside Provisions, a privately run commercial district.
However, "Westside" meaning other areas in the west side of Atlanta, or the entire west side (southwest Atlanta, northwest Atlanta), is used by the BeltLine and by Invest Atlanta, the City of Atlanta Economic Development Authority.
Both "West Midtown" and "Westside" are used by Creative Loafing and the West Midtown Design District.
References
Westside, Atlanta Wikipedia(Text) CC BY-SA