The Country Must Be Country Wide Songfacts says Brantley Gilbert wrote the song with his fellow Athens, Georgia natives Colt Ford and Mike Dekle. It originated out of a conversation between Brantley and Colt about the way their ever-broadening touring schedule was taking them outside of the South and into other parts of the country.
I grew up south of the Mason Dixon
Workin,' spittin', huntin' and fishin'
Stone cold country by the grace of God