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Index/Topics/Residual Estimation Approach

Residual Estimation Approach

A method for estimating the unauthorized population by subtracting the legally resident foreign-born from the total foreign-born population.

Fact-Checks

4 results
Jan 20, 2026
Most Viewed

Which US states have the highest numbers of undocumented

The states with the largest populations of unauthorized (undocumented) immigrants are consistently California, Texas, Florida, New York, New Jersey and Illinois — a pattern that appears across multipl...

Feb 2, 2026

n 2001 how many undocumented or illegals were in the usa

The short answer: credible estimates place the unauthorized (often called “undocumented” or “illegal”) population in in 2001 at roughly people, with official and academic estimates varying and some al...

Jan 24, 2026

What methodologies do Pew, DHS and independent researchers use to estimate unauthorized immigrant populations?

, and most independent demographers primarily rely on variants of the "residual" estimation approach—start with survey or census counts of the foreign-born, subtract the estimated legally resident for...

Jan 18, 2026

What methodologies do researchers use to estimate the unauthorized immigrant population, and how do their results differ?

Three families of methods dominate efforts to count the U.S. unauthorized immigrant population: the residual estimation approach that subtracts estimated lawful immigrants from total foreign‑born coun...

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