Median household income in the United States declined by 1.5 percent from 2010 to 2011 to $50,054, but poverty levels barely budged, according to data released by the U.S. Census Bureau on Wednesday. The income number is some 8.1 percent lower than in 2007, before the recession began. But the median income for residents of the South, while estimated lower than the rest of the country at $46,899, didn’t trend downward as it did for residents in other regions, according to the data.