Download
Share
Contents
Save
Collection 5 Resources

Illinois Population by Age

The median age in Illinois is 38.7, as per 2018-2022 ACS 5 -Year Estimates. Of the total population, 18.12% were under the age of 15, 20.13% aged 15 to 29, 45.51% aged 30 to 64, 14.18% aged 65 to 84, and 2.06% were 85 years of age and older.
Neilsberg Research Avatar
By Neilsberg Research
Updated Jul 26, 2024

Illinois population age distributions

A complete breakdown of Illinois's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.

Age Group Population % of Total Population
Under 5 years 721,165 5.65%
5 to 9 years 764,351 5.99%
10 to 14 years 826,974 6.48%
15 to 19 years 849,119 6.66%
20 to 24 years 849,609 6.66%
25 to 29 years 869,427 6.81%
30 to 34 years 865,767 6.79%
35 to 39 years 858,601 6.73%
40 to 44 years 815,165 6.39%
45 to 49 years 794,882 6.23%
50 to 54 years 813,049 6.37%
55 to 59 years 847,967 6.65%
60 to 64 years 810,651 6.35%
65 to 69 years 678,181 5.32%
70 to 74 years 534,101 4.19%
75 to 79 years 361,497 2.83%
80 to 84 years 234,731 1.84%
85 years and over 262,397 2.06%
PREMIUM
Demographic Solutions for Every Need
Select your area of interest to discover how our data can empower your decisions.
Consumer Demographics
Understand your target market better with customized consumer demographic reports.
Market Segmentation
Identify and segment your target markets effectively with detailed demographic data.
Competitor Analysis
Gain insights into competitor regions with our comprehensive demographic analysis.
Trend Forecasting
Stay ahead with predictive insights based on historical demographic trends.
For any additional data requests, please reach out to research@neilsberg.com
Location Analysis
Assess potential development sites with detailed demographic reports.
Community Demographics
Understand the population characteristics of target areas with custom data.
Market Potential
Gauge market potential with insights into population growth, income levels, and more.
Investment Feasibility
Support the financial feasibility of your real estate investments with demographic analysis.
For any additional data requests, please reach out to research@neilsberg.com
Consumer Demographics
Get deep insights into your target customer base by location with tailored reports.
Expansion Planning
Identify potential new markets for business expansion with demographic data.
Site Selection
Choose the best sites for new business locations with location-specific demographic analysis.
Competitor Insights
Inform strategic decisions with demographic comparison to competitor regions.
For any additional data requests, please reach out to research@neilsberg.com
Custom Data Reports
Support your academic research with in-depth demographic data tailored to your objectives.
Trend Analysis
Enrich your research with historical and current demographic trends across thousands of locations.
Location-Specific Insights
Access focused demographic data at city, county, state, and national levels for your studies.
Comparative Studies
Support your research hypotheses with demographic comparison reports across different regions.
For any additional data requests, please reach out to research@neilsberg.com
Community Impact Analysis
Assess the needs and potential impact in specific communities with detailed demographic reports.
Grant Application Support
Bolster your grant applications with precise, location-specific demographic insights.
Program Planning
Design and plan effective community programs with tailored demographic insights.
Impact Measurement
Measure and report the impact of your initiatives with post-implementation demographic analysis.
For any additional data requests, please reach out to research@neilsberg.com

Illinois population by age group

Key stats
4.01 million
Population under 25 years
3.41 million
Population aged 25-44
3.27 million
Population aged 45-64
2.07 million
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022

FIGURE 1

Illinois population by age group.

The largest age group is 25 to 29 years with a population of 869,427 (6.81% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
Neilsberg logo

The largest age group in Illinois was for the group of age 25 to 29 years with a population of 869,427 (6.81%), according to the 2018-2022 American Community Survey.

At the same time, the smallest age group in Illinois was the 80 to 84 years with a population of 234,731 (1.84%).

Illinois population by age cohort

To better understand the age distribution of Illinois's population, we divided it into the following 3 cohorts:

  • Children : Under the age of 18 years
  • Adults (working population): Between the age of 18 and 64 years
  • Seniors: 65 years and above

FIGURE 2

Illinois population by age cohort

The largest age group was 18 to 64 years with a population of 7.87 million (61.66% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
Neilsberg logo

Illinois population by age cohort

Here's the population for each of the three cohorts.

Age Group Population % of Total Population
Under 18 years 2,820,477 22.11%
18 to 64 years 7,866,250 61.66%
65 years and over 2,070,907 16.23%
Exploring Illinois's Diversity? Request Customized Data Now!

Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Illinois 's population under 18 was 22.11%, compared to the 22.11% nationwide.
  • Illinois's working population (between 18 and 64) was 61.66%, compared to 61.36% nationwide.
  • Illinois's elderly or the senior population (over 65 age) was 16.23% as compared to 16.53% nationwide.

Illinois population pyramid

Population pyramid for Illinois is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.

Key stats from our analysis of the Illinois's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Illinois, is 27.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Illinois, is 24.7.
  • Total dependency ratio for Illinois is 52.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Illinois is 4.0.

FIGURE 3

Illinois population pyramid

Illinois population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
Neilsberg logo

Illinois population pyramid

Here's the Illinois's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 369,069 352,096 721,165
5 to 9 years 389,011 375,340 764,351
10 to 14 years 424,566 402,408 826,974
15 to 19 years 435,034 414,085 849,119
20 to 24 years 433,294 416,315 849,609
25 to 29 years 440,022 429,405 869,427
30 to 34 years 439,013 426,754 865,767
35 to 39 years 433,926 424,675 858,601
40 to 44 years 412,580 402,585 815,165
45 to 49 years 399,642 395,240 794,882
50 to 54 years 407,602 405,447 813,049
55 to 59 years 421,210 426,757 847,967
60 to 64 years 395,042 415,609 810,651
65 to 69 years 322,656 355,525 678,181
70 to 74 years 248,048 286,053 534,101
75 to 79 years 157,600 203,897 361,497
80 to 84 years 95,396 139,335 234,731
85 years and over 89,308 173,089 262,397
Exploring Illinois's Diversity? Request Customized Data Now!

Things to know

What is the population of Illinois under 18?

Illinois's population under the age of 18 is 2.82 million, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.11% of the total resident population of Illinois.

What is the aging population in Illinois?

Illinois's population aged 65 years and above was 2.07 million. As per the U.S. Census Bureau's American Community Survey, this population is 16.23% of the entire population.

References

Datasets

Explore datasets by year of publication.
2024
Illinois Age Group Population Dataset: A Complete Breakdown of Illinois Age Demographics from 0 to 85 Years and Over, Distributed Across 18 Age Groups // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the Illinois population distribution across 18 age groups. It lists the population in each age group along with the percentage population relative of the total population for Illinois. The dataset can be utilized to understand the population distribution of Illinois by age. For example, using this dataset, we can identify the largest age group in Illinois.

Key observations

The largest age group in Illinois was for the group of age 25 to 29 years years with a population of 869,427 (6.81%), according to the ACS 2018-2022 5-Year Estimates. At the same time, the smallest age group in Illinois was the 80 to 84 years years with a population of 234,731 (1.84%). Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates

Age groups:

  • Under 5 years
  • 5 to 9 years
  • 10 to 14 years
  • 15 to 19 years
  • 20 to 24 years
  • 25 to 29 years
  • 30 to 34 years
  • 35 to 39 years
  • 40 to 44 years
  • 45 to 49 years
  • 50 to 54 years
  • 55 to 59 years
  • 60 to 64 years
  • 65 to 69 years
  • 70 to 74 years
  • 75 to 79 years
  • 80 to 84 years
  • 85 years and over

Variables / Data Columns

  • Age Group: This column displays the age group in consideration
  • Population: The population for the specific age group in the Illinois is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Illinois total population. Please note that the sum of all percentages may not equal one due to rounding of values.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Illinois Population by Age. You can refer the same here

Illinois Age Cohorts Dataset: Children, Working Adults, and Seniors in Illinois - Population and Percentage Analysis // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the Illinois population by age cohorts (Children: Under 18 years; Working population: 18-64 years; Senior population: 65 years or more). It lists the population in each age cohort group along with its percentage relative to the total population of Illinois. The dataset can be utilized to understand the population distribution across children, working population and senior population for dependency ratio, housing requirements, ageing, migration patterns etc.

Key observations

The largest age group was 18 to 64 years with a poulation of 7.87 million (61.66% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.

Age cohorts:

  • Under 18 years
  • 18 to 64 years
  • 65 years and over

Variables / Data Columns

  • Age Group: This column displays the age cohort for the Illinois population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Illinois is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Illinois is shown in the following column.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Illinois Population by Age. You can refer the same here

Illinois Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Illinois population pyramid, which represents the Illinois population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates. It lists the male and female population for each age group, along with the total population for those age groups. Higher numbers at the bottom of the table suggest population growth, whereas higher numbers at the top indicate declining birth rates. Furthermore, the dataset can be utilized to understand the youth dependency ratio, old-age dependency ratio, total dependency ratio, and potential support ratio.

Key observations

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Illinois, is 27.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Illinois, is 24.7.
  • Total dependency ratio for Illinois is 52.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Illinois is 4.0.
Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.

Age groups:

  • Under 5 years
  • 5 to 9 years
  • 10 to 14 years
  • 15 to 19 years
  • 20 to 24 years
  • 25 to 29 years
  • 30 to 34 years
  • 35 to 39 years
  • 40 to 44 years
  • 45 to 49 years
  • 50 to 54 years
  • 55 to 59 years
  • 60 to 64 years
  • 65 to 69 years
  • 70 to 74 years
  • 75 to 79 years
  • 80 to 84 years
  • 85 years and over

Variables / Data Columns

  • Age Group: This column displays the age group for the Illinois population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Illinois for the selected age group is shown in the following column.
  • Population (Female): The female population in the Illinois for the selected age group is shown in the following column.
  • Total Population: The total population of the Illinois for the selected age group is shown in the following column.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Illinois Population by Age. You can refer the same here

If you're looking for datasets from another year, please feel free to contact us at research@neilsberg.com and we'll be happy to assist you further.

Explore related topics

Illinois Demographics Illinois Population

Explore more

About the author

Neilsberg Research Avatar
Neilsberg Research
Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.
Read more from Neilsberg Research ➔

Share

This article is for informational purposes only and is not intended to be legal or tax advice. We recommend that you consult with a qualified professional such as a lawyer or accountant before making a decision. Many of the products and services featured here are from our affiliate partners. We may receive commissions on purchases made from our chosen links. Read advertiser disclosure.
Collection 5 Resources