The Washington Post reports:

The three most prosperous large counties in the United States are in the Washington suburbs, according to census figures released yesterday, which show that the region has the second-highest income and the least poverty of any major metropolitan area in the country.

Rapidly growing Loudoun County has emerged as the wealthiest jurisdiction in the nation, with its households last year having a median income of more than $98,000. It is followed by Fairfax and Howard counties, with Montgomery County not far behind.

That accumulation of suburban wealth, local economists said, is a side effect of the enormous flow of federal money into the region through contracts for defense and homeland security work in the five years since the Sept. 11, 2001, attacks, coming after the local technology boom of the 1990s. “When you put that together . . . you have a recipe for heightened prosperity,” said Anirban Basu, an economist at a Baltimore consulting firm.

The result is that the Washington area’s households rank second in income only to those in San Jose, eclipsing such well-heeled places as San Francisco and the bedroom suburbs of New York.

We came very close to moving to Loudoun County recently.