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In summary, DHS estimates that the unauthorized immigrant population living in the United States decreased to 10.8 million in January 2009 from 11.6 million in January 2008. Between 2000 and 2009, the unauthorized population grew by 27 percent. Of all unauthorized immigrants living in the United States in 2009, 63 percent entered before 2000, and 62 percent were from Mexico
This report provides estimates of the number of unauthorized immigrants residing in the United States as of January 2009 by period of entry, region and country of origin, state of residence, age, and gender.