I got an apparent tie between Jackson, MS; Birmingham, AL (the metro area I'm actually from); and Montgomery, AL. I got the same results when I took this a few months ago, so it's not too surprising. However, while my word usage apparently makes where I'm from easy to determine, my accent always throws people off, considering that I don't have much of a southern accent. When I was a server in a restaurant a few years ago, people always assumed I was from California or Ohio or something.