About 20.5 million Americans, or 6.7 percent of the U.S. population, make up the poorest poor, defined as those at 50 per cent or less of the official poverty level.

Those living in deep poverty represent nearly half of the 46.2 million people scraping by below the poverty line. In 2010, the poorest poor meant an income of $5,570 or less for an individual and $11,157 for a family of four.

That 6.7 percent share is the highest in the 35 years that the Census Bureau has maintained such records, surpassing previous highs in 2009 and 1993 of just over 6 percent.