Is Cook County, IL's population growing or shrinking?
Updated annually
It grew by 40,100 between 2023 and 2024, the seventh-most among all counties in the US. Changes in population reflect birth and death rates, immigration patterns, regional shifts, and even the overall health of the economy. Cook County, IL’s 0.78% annual increase was primarily driven by immigration to the state.
In the decade between 2014 and 2024, Cook County, IL’s population shrank by 1.4%.
+40.1K
population change (2023 to 2024)
+0.78%
percent change in population (2023 to 2024)
Since 2000, Cook County, IL’s population increased 9 out of 24 years. The largest increase occurred between 2019 and 2020, when Cook County, IL gained 121,700 residents. Its largest decline occurred between 2009 and 2010 when there were 85,800 fewer residents.
Cook County, IL gained 40,100 residents between 2023 and 2024.
Annual population change
A county’s population is influenced by three factors:
- Natural population change: If births outnumber deaths in a given year, natural population growth is positive. If deaths exceed births, it is negative. Between 2023 and 2024 natural population change was positive in Cook County, IL, with births exceeding deaths by 9,500.
- Immigration: international migration directly into or out of a county: If more people move in than move out, population change from immigration is positive. If more people move out than move in, it’s negative. Between 2023 to 2024, Cook County, IL’s population change from immigration was positive with about 67,800 more people coming from another country directly to Cook County, IL than leaving.
- Domestic migration, moving between counties: Between 2023 to 2024, Cook County, IL’s population change from domestic migration was negative with about 37,200 more people moving to any other county in the US.
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Between 2023 and 2024, immigration was the primary driver of population growth in Cook County, IL.
Components of population change
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
