Loudoun County is in but not of the South. The majority of the residents, and nearly all of the wealthy residents, were born outside of the South, or their parents were.
Not so for Forsyth County.
Also, government workers and so on.
These days, "the South" as a demographic descriptor doesn't really extend north of the triangle area of NC. VA does not have large, monolithic constituencies. NOVA is different from Appalachia is different from Norfolk is different from Richmond.
There are South-ish areas of VA, to be sure, but I don't think the same sort of southern identity applies. Certainly not in affluent NOVA. Comparing Forsyth Co. to Loudon Co. is rather like comparing it to Westchester Co., NY.
