Loudoun County’s well-heeled households keep getting richer while gentrification is boosting incomes in the District even as the region’s other households are faltering in the post-recession era.

Loudoun added to its lead as the richest county in the region as median household incomes reached nearly $120,000 in 2010, for an 8 percent increase over 2008, according to the U.S. Census Bureau. Meanwhile, Loudoun’s nearest competitors — Fairfax and Howard counties — are losing ground as median household incomes there stayed flat.

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