Aetna is a populated place LOCATED WITHIN the City of Gary. In turn, the City of Gary is located within Lake County.
Aetna is located at latitude 41.592 and longitude -87.289.
Since Aetna is located within the City of Gary, all of the census and demographic data for residents of Aetna are included as part of the information reported for City of Gary in the "Profile" tab above.