MONEYLAND: “The new top three [richest U.S. counties] are now Loudon County, Virginia; Fairfax County, Virginia; and Howard County, Maryland. All three are suburbs or exurbs of Washington, D.C. In 2000, 14 of the 100 richest counties were in the Washington, D.C., area. In 2007, it was nine of the richest 20.” [Reason]