In 2019, the US Undocumented Population Continued a Decade-Long Decline and the Foreign-Born Population Neared Zero Growth

Robert Warren
Content Type
Journal Article
Journal on Migration and Human Security
Issue Number
Publication Date
Spring 2021
Center for Migration Studies of New York
This report presents new estimates of the undocumented population residing in the United States in July 2019, by country of origin and state of residence. The Center for Migration Studies (CMS) derived the estimates by analyzing data collected in the annual American Community Survey (ACS) conducted by the US Census Bureau (Ruggles et al. 2020). The methodology used to estimate the undocumented population is described in the Appendix. The report highlights an aspect of population change — the number leaving the population — that is often overlooked in discussions of immigration trends. The report shows that the annual numbers leaving the population, especially through return migration to Mexico, have been the primary determinant of population change in the undocumented population in the past decade. Increasing numbers leaving the population have also led to near-zero growth of the total foreign-born population, which grew by just 20,000 from July 2018 to June 2019, the slowest growth in that population in more than a half-century.
Migration, Immigration, Borders, Undocumented Population
Political Geography
North America, United States of America