IDK if pretty much everyone can exclude Florida and Texas, the second and third most populated states. (Or I suppose you could be excluding the Northeast Corridor instead of Florida)
I'm no expert on USA but looking at a map Florida is very obviously on the east coast, and the entire peninsula is only slightly wider than GP's 100 miles.
Touche, I was thinking of it more as 100 miles in length, not 100 miles in width running all the way down the coast, but your interpretation seems more correct.
The population of the NYC metro area exceeds that of the entire US Mountain _timezone_.