Excluding Georgia because of Atlanta and Oklahoma because it's not Deep Southern, interestingly enough, Gallup found that in 2015-2016, about 1% more adults identified as LGBT in Mississippi than in Arkansas, Alabama, or South Carolina. Granted, that's according to a map on Google Images from a site I can't load because I just started an overtime shift at work and I'm out of cellular data, so someone tell me if it's junk.
https://prosuzy.com/2017/02/gallup-poll-reveals-states-highest-lgbt-population/