A 2018 study by researchers at MIT Sloan and Yale School of Management estimated the undocumented immigrant population in the United States at about 22.1 million.
September 21, 2018
high
temporal
Estimate produced by a 2018 academic study using operational and demographic data to model inflows and outflows of undocumented immigrants.
The same 2018 study reported a conservative estimate of about 16.7 million undocumented immigrants in the United States.
September 21, 2018
high
temporal
Lower-bound estimate from the study using conservative parameter assumptions.
In 2015 the U.S. Department of Homeland Security began systematically collecting data on visa overstays.
January 01, 2015
high
temporal
Administrative data collection on visa overstays became systematic starting in 2015, enabling improved estimation of visa overstay-related flows.