The Pew Research Center estimates the undocumented population in the U.S. has grown substantially since 2021. AdvertisementCalifornia led the country with the largest unauthorized immigrant population at 2.3 million people, followed by Texas with 2.1 million people and Florida with 1.6 million people. AdvertisementIn regard to the U.S. workforce, unauthorized immigrants made up 5.6% of the national workforce. In California, unauthorized immigrants made up 8% of the statewide workforce by 2023. Despite that falloff, it is still believed that — as of July 2025 — the unauthorized immigrant population “almost surely” remains higher than in July 2023.