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Index/Topics/Undocumented immigrant population estimates

Undocumented immigrant population estimates

Estimates of the undocumented immigrant population in the United States vary across research organizations and government agencies

Fact-Checks

4 results
Jan 27, 2026
Most Viewed

Did Biden let in 15 million illegals

No — the claim that “let in 15 million illegals” is not supported by the available data; government encounter tallies, independent population estimates, and fact-checking reports show far lower figure...

Jan 31, 2026
Most Viewed

How many illegal immigrants came into the United States while Joe Biden was president

A single, definitive count of " while was president" does not exist in the public record because different sources measure different things — border "encounters," releases into the country, removals/e...

Jan 31, 2026

How do immigration enforcement needs correlate with undocumented immigrant population by state?

vary across reputable sources, but all show strong geographic concentration: a handful of states host a large share of the population, and enforcement “needs” — measured by detentions, removals, court...

Jan 24, 2026

What methods do demographers use to estimate the unauthorized immigrant population and how do those estimates differ?

Demographers estimate the unauthorized immigrant population using several distinct approaches—most prominently the , , , and —and these approaches can produce different point estimates and trends beca...

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