California is the leading state of residence, with 2.0 million, or 40 percent of the undocumented population. The 7 states with the largest estimated numbers of undocumented immigrants--California (2.0 million), Texas (700,000), New York (540,000), Florida (350,000), Illinois (290,000),
New Jersey (135,000), and Arizona (115,000)--accounted for 83 percent of the total population in October 1996.
Mexico is the leading country of origin, with 2.7 million, or 54 percent, of the population. The Mexican undocumented population has grown at an average annual level of just over 150,000 since 1988. The 14 countries with 50,000 or more undocumented immigrants in 1996 accounted for 81 percent of the total population. The large majority, over 80 percent, of all undocumented immigrants are from countries in the Western Hemisphere.