This is from the info I gathered on swvafootball.com, since 2001. It was pretty easy to do. That site has a lot of good information; G-Man's website is second to none as far as this area goes for high school football:

Gate City 32-3 91.4% winning percentage
Powell Valley 31-4 88.5%
J.I. Burton 18-17 51.4%
Clintwood 17-18 48.5%
Appalachia 15-20 42.8%
J.J. Kelly 13-22 37.1%
Pound 7-28 20%
Coeburn 6-29 17.1%