Six counties in the D.C. region are among the top 10 wealthiest in the country, and the metropolitan region as a whole is America's richest, according to new census data for 2010.

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The region jumped to first place thanks to a $99 rise in the median household income, combined with falling income in the San Jose, Calif. region, which ranked second in 2009. Loudoun County topped the wealthiest county list with a median household income of $119,540 — a jump from $112,021 in 2009 — and Fairfax County was second, despite an income drop.

The other counties are Montgomery, Howard, Arlington, Stafford and Prince William, which explains why Maryland was first, and Virginia 8th, on a list of the country's wealthiest states. Despite not being a state, D.C. placed 9th on that list.

[Examiner]