There were 11.1 million unauthorized immigrants living in the U.S. in March 2011, unchanged from the previous two years and a continuation of the sharp decline in this population since its peak in 2007, according to estimates by the Pew Hispanic Center, a project of the Pew Research Center.
The estimate for 2011 is not statistically different from totals for 2010 (11.2 million) or 2009 (11.1 million).1 The number of unauthorized immigrants peaked in 2007 at 12 million, and the decline since then has been the first significant decrease following two decades of growth.
The falloff in the stock of unauthorized immigrants has been driven mainly by a decrease in the number of new immigrants from Mexico, the single largest source of U.S. migrants. As the Pew Hispanic Center reported earlier this year, net immigration from Mexico to the United States has stopped and possibly reversed through 2010. At its peak in 2000, about 770,000 immigrants arrived annually from Mexico; the majority arrived illegally. By 2010, the inflow had dropped to about 140,000—a majority of whom arrived as legal immigrants, according to Pew Hispanic Center estimates.
Read the full article, 11.1 Million Unauthorized Immigrants Were Living in the U.S. in 2011, on the Pew Hispanic Center website.