Undocumented immigrant population of the United States

The undocumented immigrant population of the United States is the number of resident unauthorized immigrants living on United States territory. The number of such immigrants, and their specific countries of origin, has always been difficult to determine, and the U.S. federal government has never undertaken an official count of such individuals. Estimates of this population, derived from national surveys, administrative data, and other sources of information, vary widely. By all measures, the population of undocumented immigrants in the U.S. declined substantially from 2007 until at least 2018. The Pew Research Center reported that the number of border apprehensions declined considerably after 2000, reaching a low in 2017. However, apprehensions rebounded to reach a new peak level in 2021. In a 2025 report, Pew estimated that the population of undocumented immigrants in the U.S. had risen to 14 million in 2023.

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