For the most part, Forbes’ latest billionaire list is a who’s who of New York’s hedge fund managers and the West Coast’s tech giants, with a few oil barons and other old-money types sprinkled in for good measure. But the D.C. area is actually home to two of the 25 richest Americans, and six of the 10 richest counties.

Forbes did not provide pictures of Forest Mars, Jr. or John Mars, but does list their hometowns as McLean and Arlington, respectively. Each man is said to have a net worth of $11 billion, but both being well into their 70s, you probably won’t see them crashing Rhino Bar with the Real World D.C. cast anytime soon. There were 12 other D.C.-based billionaires on the larger list, including Nationals owner Ted Lerner and Redskins owner Dan Snyder.

As for the richest counties, Loudoun County and Fairfax County had the highest median incomes in the country, with Fairfax City and Arlington County also making the top 10. Montgomery County clocked in at number 10, falling from number eight in 2008, fueling ongoing speculation that Maryland is losing some of its appeal to high-net worth individuals — although Howard County, Md., had the third highest-median income. Even Alexandria and Prince William County appear in the top 25.

Keep in mind, for Loudoun and Howard counties, you’re only looking at roughly 300,000 people per county, so if half of the households of those two counties are doctors, lawyers, lobbyists and bureaucrats, many of whom are going to be married and have two incomes, that sounds about right. Fairfax and Montgomery counties, meanwhile, have closer to 1 million people each.