Fascinating map... so clearly the Lakers are the default team, much like the Yankees in baseball. I'm a little surprised by that as I thought the Heat would have more of a following throughout North America.
So the Maritimes also appear to be Raptors country... that's basically it once you get outside of Ontario.
Poor Clippers, though... barely number 3 in their own market

At least the Nets can claim their own county.
Also, the southeastern teams (except for the Heat) have much smaller footprints than I would have expected.