According to Pew Research Center, the immigrant population in the United States was 40.4 million, a record high for the country.  In 2011, the 13% of immigrants living in the United States was slightly lower than the nation's peak at 15%, which occurred between 1890 and 1920.  The 40.4 million immigrants in the United States are distinctly comprised of Latin Americans (50%) and Asians (27%), as opposed to the influx of European immigrants in the period between 1890 and 1920.

The population of unauthorized immigrants, a segment of the 40.4 million immigrants in the United States, were down slightly since 2007, from 12 million to 11.1 in 2011.  Highlighting other trends relating to unauthorized immigration, Pew links to further analysis in other articles, which can be found here.