I would personally avoid mentioning Atlanta specifically. I've heard from reputable sources that, while it's not as bad as it used to be, the adcoms in prior years expressed a definite bias against students from Atlanta. If the rest of your app looks great, I doubt wanting to work in/around Atlanta would make or break you, but I just see it as an easily avoidable potential negative mark against you. I myself have a huge passion for working with underserved populations but have never lived in nor intend to live in a rural area, so I just focused on my experiences with those populations, my understanding of the obstacles they faced in seeking care, and why I wanted to serve them once I was a physician. I focused more on demographic characteristics of the types of populations I would like to serve (racial minority, low SES, etc) as opposed to where they were physically located if that makes sense.