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Index/Topics/Unauthorized Residents Estimate 2023

Unauthorized Residents Estimate 2023

The estimate of unauthorized residents in the US, with FAIR estimating 18.6 million and Pew estimating 14 million, and the methodological differences between the two estimates.

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2 results
Jan 31, 2026
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What is the estimated number of illegal aliens by state

(unauthorized or undocumented immigrants) living in each vary significantly depending on methodology and data vintage: major analytic centers publish divergent national totals—roughly 11.0 million (DH...

Jan 6, 2026

What methodologies produce the large disparities between FAIR’s 18.6M estimate and Pew’s 14M estimate of unauthorized residents?

The gulf between FAIR’s 18.6 million figure and Pew’s 14 million estimate of unauthorized residents flows from methodological choices about data sources, timing, who is counted as “unauthorized,” and ...

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