Estimates of the Unauthorized Immigrant Population Residing in the United States: January 2007 [open pdf - 291KB]
"This [Homeland Security] report provides estimates of the number of unauthorized immigrants residing in the United States as of January 2007 by period of entry, region and country of origin, state of residence, age and gender. The estimates were obtained using the 'residual' methodology employed for estimates of the unauthorized population in 2005 and 2006 (see Hoefer, Rytina and Campbell, 2006; 2007). The unauthorized resident population is the remainder or 'residual' after estimates of the legally resident foreign-born population - legal permanent residents (LPRs), asylees, refugees, and nonimmigrants - are subtracted from estimates of the total foreign-born population. Data to estimate the legally resident population were obtained primarily from the Department of Homeland Security (DHS) while the American Community Survey (ACS) of the U.S. Census Bureau was the source for estimates of the total foreign-born population."
U.S. Department of Homeland Security (DHS): http://www.dhs.gov/