Illegal Immigrant Population Surged to All-Time High of 15.8 Million Under Biden, Study Says

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The Migration Policy Institute, a nonpartisan think tank based in New York, estimated that approximately 15.8 million people were residing in the U.S. illegally as of mid-2024, just as the historic border crisis was winding down.

The figure shows that the illegal immigrant population grew from the 11 million level seen throughout the 2010s to this new high as a result of millions of illegal border crossers being released into the U.S. indefinitely and foreigners paroled into the country through a Biden-era program.

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One of the biggest changes in the numbers was in the countries immigrants came from.

Historically, Mexican nationals have made up the majority of illegal immigrants inside the U.S. Although Mexicans remained the No. 1 nationality of illegal immigrants, Central and South American countries saw major increases.