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Index/Topics/Undocumented Immigrant Population Estimates 2021-2026

Undocumented Immigrant Population Estimates 2021-2026

Estimates of the undocumented immigrant population in the United States from 2021 to 2026, including methods and data sources used by different research groups and organizations.

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Jan 28, 2026
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How do estimates of undocumented immigrant populations differ between research groups and how does that affect apportionment projections?

Estimates of the undocumented (unauthorized) immigrant population diverge because research groups use different data sources and methods—residual calculations from surveys like the /, administrative r...