NOTES: All estimates include the household population (273.6 million people), the group quarters population (about 7.3 million people), and people enumerated in special operations not included in the A.C.E. (e.g., the remote Alaska enumeration). The percentage net undercount is calculated as the population estimate minus the census count divided by the estimate. Minus sign (–) indicates a net overcount of the population.
a The base demographic analysis estimate was made available in January 2001; it assumes about 6.0 million undocumented immigrants living in the United States under age 65 in April 2000—3.3 million from the 1990 DA estimate plus a net increase during the 1990s of 2.7 million.
b The alternate demographic analysis estimate was made available in March 2001; it assumes a net increase in illegal immigration during the 1990s of 5.4 million for a total of 8.7 million undocumented immigrants as of April 2000.
SOURCE: Robinson (2001a:Table 3).