My sorority sister was offended when I said she was from Atlanta, she said "I'm from Marietta, not Atlanta!".
That was the first semester away from home...45 miles on the east side of Atlanta and UWG was about 30 minutes west of Atlanta so everything else was Atlanta.
When I am out of state these days, people ask me where I'm from and I say "Atlanta...or at least 30 minutes south of the Atl airport or 45 minutes east".