The estimates presented in this research are the Center’s latest, adding new and updated annual estimates for 2017 through 2021.Ĭenter estimates of the unauthorized immigrant population use a “residual method.” It is similar to methods used by the U.S. unauthorized immigrant population for more than two decades. The Center has published estimates of the U.S. Pew Research Center undertook this research to understand ongoing changes in the size and characteristics of the unauthorized immigrant population in the United States.
