Americans’ incomes have risen in recent years, but the wealth hasn’t been evenly distributed, according to the latest estimates from the U.S. Census Bureau.

Nationally, median household income rose 1.9 percent – reaching $57,652 – when comparing five-year estimates covering 2008-2012 and 2013-2017. Household income generally was higher in urban counties than in rural counties, and rose in 16.6 percent of counties while falling in 7.1 percent of counties between the two five-year periods.

There were 21 counties with median household incomes above $100,000, the new estimates show, and half of the top 10 fell in northern Virginia, just outside the nation’s capital, which itself boasted a median income of $77,649.

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The Census Bureau says its five-year figures represent its most precise estimates , particularly when measuring areas with small populations. The figures can help provide insight into everything from a county's economic outlook to the health and well-being of its residents, as people with higher incomes tend to have better health outcomes and longer life expectancies than those who earn less.

Among counties and county equivalents with 10,000 or more residents, these are the 10 richest by median household income, according to census estimates.