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  1. Home
  2. Data and Reports by Topic
  3. Immigration
  4. Illegal Aliens


Illegal Aliens

Most illegal aliens either entered the United States without inspection or were admitted temporarily and stayed past the date they were required to leave.

Reports

  • Illegal Alien Population Estimates

    These reports provide estimates of the size of the illegal alien population residing in the United States by period of entry, region and country of origin, state of residence, age, and sex.

  • COVID-19 Vulnerability by Immigration Status

    This report presents population estimates by four categories of immigration status – lawful permanent residents, resident nonimmigrants, refugees and asylees, and unauthorized aliens – and addresses unique COVID-19-related risks each status group may face.

Last updated: August 8, 2025

OHSS.DHS.gov

An official website of the U.S. Department of Homeland Security