FWIW Fairfax County, VA is about as rich, white, and suburban place that you can find in the US.
To be fair, though, Alexandria is not fair from Arlington, and about the only people who can afford to live in either of them these days are trust fund babies.
"White" not so much. It's about 63% white, which is similar to the nation as a whole.
"Suburban" for sure.
So I'd say two out of three on that one.
It is a diverse area. My neighborhood is single-family homes and I would wager half of them are just scraping by. Two blocks in either direction and you'll see abject poverty or McMansions nestled on too little land next to military housing from the 30s.