Illinois: share of population by age group 2021

In 2021, about 13.5 percent of the population in Illinois was between the ages of 25 and 34 years old. A further 13.3 percent of people in Illinois were between the ages of 35 and 44 years old.

Distribution of resident population of Illinois in 2021, by age group

Years of age	Share of residents
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Release date

September 2022

More information

Region

United States

Survey time period

2021

Supplementary notes

Figures may not add up to 100 percent due to rounding.

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