maybe in the middle of the state. i live about an hour south of Tampa and i don't really know anyone who says y'all. but i have cousins who live in Sebring and others in Perry and now that i think about it, that's definitely y'all territory.
I live in Texas to be specific I live in Galveston Texas and everyone I know says y'all by the way texans aren't as cowboyish as y'all make us out to be (and Galvestons beach is not blue)
I know some people who say "y'all", but I'm not sure that they originate from Virginia, so they might have picked that up from where they grew up/were born.
Just kidding I say everybody