With those two ACC schools making up about 20-25% of the fans. I'm still not certain whether that would give the ACC full carriage rates in the DC market - I think it does, but WVU doesn't reach the top-3 until you get into the border zip codes.
B1G schools (Penn St., Ohio St., and Michigan) often in the top-3:
https://www.nytimes.com/interactive/2014/10/03/upshot/ncaa-football-map.html#9,38.513,-77.532
[Zoom in and then you can scroll over zip codes to see the numbers]
(the information is a few year old, but.....)
A lot of North Carolina fans in southern Virginia, where UNC comes in #2 or #3 in many zip codes.