The chart shows the locations served by the top 10 US cable TV providers. (via Morning Bridge).
With the notable exception of Cablevision, the footprints of the top 10 cable operators haven't changed much over the past year. Time Warner and Comcast continue to dominate the northeast, Charter and Mediacom lay claim to large swaths of the midwest, Time Warner and Charter hold much of the west coast and Cox is found mostly in the south.
The big change, of course, is in Cablevision's purchase of Bresnan Communications. That gives the New-York based MSO a strong foothold in large (though mostly rural) swaths of the Rocky Mountains. For now, those systems continue to be branded under the Bresnan name.
For a larger .pdf version of the map click here.