The Washington region has the lowest poverty rate of any metropolitan area in the country, according to a census analysis of how many people had incomes below the poverty line in the previous two years.

About 8.4 percent of the region’s residents were living below the poverty threshold in 2010. That was almost a full percentage point lower than Honolulu, the next lowest city on the list released by the Census Bureau on Thursday.

The highest poverty rates were all in the West and the South. McAllen, Tex., had the most poverty, with fully a third of the population living in poverty. It was followed by Fresno, Calif.; El Paso, Tex., and Bakersfield, Calif., all of which had rates above 20 percent.

In 2010, Maryland was one of only six states that experienced a poverty rate of under 10 percent, though just barely. According to the census, its rate rose from 9.1 percent in 2009 to 9.9 percent last year.

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