Estimates of the Unauthorized Immigrant Population Residing in the United States: January 2006 [open pdf - 576KB]
"This report provides estimates of the number of unauthorized immigrants residing in the United States as of January 2006 by period of entry, region and country of origin, and state of residence. The estimates were obtained using the same 'residual' methodology employed for estimates of the unauthorized population in 2005. In summary, there were an estimated 11.6 million unauthorized immigrants living in the United States as of January 2006. Nearly 4.2 million had entered in 2000 or later. An estimated 6.6 million of the 11.6 million unauthorized residents were from Mexico."