The poverty rate was 15%, up from 14.3% in 2009, the highest jump ever in the year after a recession.
It cut its poverty rate to about 19% from 33% in 1990, but Mr Nag said this improvement was under threat because of inflation.
In at least 30 counties with populations ranging from just over 2,000 people to nearly 62,250 people, the poverty rate for all ages is more than one in three, the Census showed.
Indeed, East Asia's extreme poverty rate dropped to 9 percent in 2004.
Texas has America's highest rate of people without health-care insurance, for example, and one of the highest poverty rates.
Neighborhoods with poverty rates of at least 40 percent are stretching over broader areas, increasing in suburbs at twice the rate of cities.
In Asia, as cereal yields rose, poverty rates plummeted.
A dramatic fall in China's poverty rate, from 60% to 16%, has therefore had a big impact on global poverty, which seems set to meet its 2015 target.
Partly because of that failure, and despite sharp falls in the poverty rate, appalling Numbers of Indians are still desperately poor.
Arizona now has the second highest poverty rate in the nation, after Mississippi.
The United States has the third worst poverty rate among the advanced nations tracked by the Organization for Economic Cooperation and Development.
The absence of food stamps separately would increase the poverty rate to 17.2 percent.
Since independence in 1990, after a 23-year war of liberation, Namibia's GDP per head has doubled in real terms, yet the poverty rate, according to the World Bank, is the same.
The best news is that the share of people living on less than $1.25 a day seems on track to meet the goal of halving the extreme poverty rate.
Under the official poverty rate, about 8.9 percent lived in poverty, mostly because they benefit from Social Security cash payments.
Newfoundland, helped by royalties from oil and mining, has cut its poverty rate in half (to 6.5%).
Per unit of growth, Brazil reduced its proportional poverty rate five times more than China or India did.
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