No, they are not.
What's going on down there that we don't know about........LOL.
Check it:
http://en.wikipedia.org/wiki/Rex,_North_Carolina
Rex is a "Census Designated Place" (CDP) with "55 people, 17 households, and 13 families residing in the CDP" as of the 2000 census.
It's not hard to drive the per capita income into the stratosphere when you have 17 households with high income.
My guess is that this "Census Designated Place" is some gated community for "the rich".
Let's get Edwards to investigate! Obviously this is an address in the other of the Two Americas.