Statistical Research
All statistics regarding undocumented residents are estimates only. For obvious reasons, people with undocumented status may not want to disclose that information to organizations that count populations (often, government agencies).
- How many undocumented immigrants are in the United States and who are they?
Dated Nov. 12, 2019. This "Voter Vitals" article from the Brookings Institute summarizes why it's so difficult to estimate undocumented populations and looks at common sources of data.
- Profile of the Unauthorized Population: United States
Estimates from the Migration Policy Institute.
- Estimates of the Unauthorized Immigrant Population Residing in the United States
From the U.S. Department of Homeland Security.
- Explainer: Illegal Immigration in the United States
From the Migration Policy Institute, includes population estimates from 2000-2017.