The issue of undocumented immigration continues to shape social and political dynamics across the United States. In Illinois, this topic has gained heightened attention as new data reveal the state now has the fifth-largest illegal immigrant population in the country.
Migration patterns, state policy, and budgetary impacts are driving local debates, with officials and residents considering the ramifications for public resources, communities, and the workforce.
Scale of the Population
Recent statistics estimate that approximately 400,000 to 500,000 undocumented immigrants reside in Illinois, accounting for roughly 22% of the state’s immigrant population and about 3% of its total state population.
In 2023 and 2024, Illinois has seen an influx of migrants, notably those transported from the southern border, with an estimated 51,000 illegal immigrants arriving in Chicago alone in this period, primarily from Texas.
Nationally, the U.S. undocumented population reached 12.2 million in 2023, surpassing previous historic numbers, with Illinois hosting one of the largest state shares.
Economic and Budgetary Impact
Illinois’ commitment to providing for this population has had significant financial implications. By the end of 2025, state expenditures on migrant care are projected to top $2.5 billion, driven mainly by spiraling healthcare costs.
The largest slice of these funds—over $1.6 billion—has been spent on health care, allocated through two primary programs: the Health Benefits for Immigrant Seniors and the Health Benefits for Immigrant Adults. Actual costs of these programs have exceeded projections by as much as 84% for seniors, and nearly 400% for adults, leading to statewide budgetary pressures and the recent termination of the adult migrant program due to unsustainable costs.
Additional funds, approximately $478 million since 2023, have been devoted to welcome centers, housing, emergency food, resettlement, and rental assistance under “Welcoming with Dignity” policies.
Demographic and Workforce Contributions
Illinois’s large immigrant community—1 in 7 state residents—is diverse and economically active. Approximately 18.6% of jobs in Illinois are held by immigrants, which include both documented and undocumented individuals, and immigrants make up 17.7% of the total working-age population.
These figures highlight higher labor force participation among immigrants compared to native-born residents—68.2% vs 64.5% in 2023—demonstrating that immigrants, including undocumented residents, are vital contributors to the workforce, especially in sectors like food services, construction, and manufacturing.
Many Illinois residents live in “mixed-status families”: 395,000 U.S. citizens in the state have at least one undocumented family member, and about 1 in 10 children has a U.S. citizen status but an undocumented relative at home.
Social and Political Debate
Response to the growing undocumented population is sharply divided. Proponents of current sanctuary and humanitarian policies, such as Governor J.B. Pritzker, cite compassion and public safety as motivations for supporting migrants.
Critics argue that the fiscal burden—compounded by cost overruns and resource constraints—diverts funds from other urgent needs like homelessness and education. Congressional hearings and local debates reflect these tensions, pointing to education, policing, healthcare, and housing as hot-button issues.
Conclusion
Illinois’s position as the state with the fifth-largest population of undocumented immigrants underscores the interplay of national policy failures and local responses. The state remains deeply impacted by the costs and benefits of migration—immigrants contribute to Illinois’s economy and labor force, yet funding their needs strains the state’s resources.
The debate is far from settled, as leaders and constituents grapple with balancing humanitarian principles, fiscal responsibility, and the realities of a complex and growing migrant population.
Source:
[1] https://www.fox32chicago.com/news/illinois-migrants-spending
[2] https://www.illinoispolicy.org/think-illinois-spends-millions-on-migrants-wrong-it-spends-billions/
[3] https://www.americanimmigrationcouncil.org/wp-content/uploads/2025/01/immigrants_in_illinois.pdf
[4] https://usafacts.org/answers/what-percent-of-jobs-in-the-us-are-held-by-immigrants/state/illinois/
[5] https://www.migrationpolicy.org/data/unauthorized-immigrant-population/state/IL
[6] https://www.pewresearch.org/short-reads/2024/07/22/what-we-know-about-unauthorized-immigrants-living-in-the-us/
[7] https://www.americanimmigrationcouncil.org/fact-sheet/immigrants-in-illinois/
[8] https://cmsny.org/publications/the-undocumented-population-in-the-united-states-increased-to-12-million-in-2023/
[9] https://www.bushcenter.org/publications/monthly-immigration-update-june-2025