Illinois
Illinois sees third-straight year of population growth. What to know
Illinois’ population has grown for the third consecutive year, according to new estimates from the U.S. Census Bureau.
Between July 1, 2024, and July 1, 2025, Illinois added 16,108 residents – an increase of more than 100,000 residents since 2022.
“Illinois recorded its third consecutive year of population growth, as the state remains focused on strengthening the factors that help people choose to stay and build their lives here,” said Gov. JB Pritzker. “That’s why we are focused on making long-term investments in education, public safety, and economic opportunity — so families can raise their kids here, workers can build careers, and entrepreneurs can start and grow businesses across Illinois.”
Illinois population growth in the last year was in part due to natural population gains and slowing domestic outmigration. The state’s birth rate continued to outpace its death rate with approximately 125,000 births and 114,000 deaths, for a net gain of about 11,000 residents. The domestic outmigration fell to its lowest level in 15 years, with 40,017 residents leaving Illinois between July 2024 and 2025.
Recent population estimates also reflect ongoing efforts from state officials to improve the accuracy of Illinois’ census data. Following the 2020 Census, the U.S. Census Bureau’s Post-Enumeration Survey found Illinois was undercounted by approximately 250,000 people, reflecting Illinois crossing 13 million residents. A subsequent Post-Census Group Quarters Review also identified more than 46,000 additional residents now incorporated into population estimates in later years.