NYC region may actually be big and rich enough to have sorting between the 0.1%ers (Wall Street hedge fund managers, celebrities etc.) and the "regular" 1-2%ers (like medical specialists and law firm partners). I would think Bronxville and Scarsdale are the latter demographic. While the "super-rich" are more in Manhattan or coastal Connecticut.
The latter don't really dominate any particular town, though. You can look at Street View in coastal New Rochelle (Premium Point), Rye (Peningo Neck) or Sands Point, or somewhere like Belle Haven in Greenwich, CT and see how rich they are, but the local municipalities include many humdrum UMC areas and in some cases even some areas that wouldn't qualify as well-off at all.
Probably the most purely super-rich municipality in the NYC metro with no areas within municipal boundaries that look even UMC is Alpine, NJ.
One other thing to add is that NYC metro super-rich areas don't necessarily look as flashy as somewhere like Atherton, California because the homes are older and smaller.
They don't numerically dominate any town, no. But there might be some differences in where they live.
