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St. Clair County, IL Population by Age

The median age in St. Clair County, IL is 39.4, as per 2018-2022 ACS 5 -Year Estimates. Of the total population, 19.21% were under the age of 15, 18.94% aged 15 to 29, 45.51% aged 30 to 64, 14.34% aged 65 to 84, and 2.03% were 85 years of age and older.
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By Neilsberg Research
Updated Jul 26, 2024

St. Clair County, IL population age distributions

A complete breakdown of St. Clair County'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 15,437 6.01%
5 to 9 years 15,165 5.91%
10 to 14 years 18,716 7.29%
15 to 19 years 16,790 6.54%
20 to 24 years 15,436 6.01%
25 to 29 years 16,399 6.39%
30 to 34 years 16,478 6.42%
35 to 39 years 16,114 6.28%
40 to 44 years 17,342 6.75%
45 to 49 years 15,395 6%
50 to 54 years 15,997 6.23%
55 to 59 years 17,655 6.88%
60 to 64 years 17,849 6.95%
65 to 69 years 13,843 5.39%
70 to 74 years 11,546 4.5%
75 to 79 years 7,113 2.77%
80 to 84 years 4,313 1.68%
85 years and over 5,203 2.03%
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St. Clair County, IL population by age group

Key stats
81,544
Population under 25 years
66,333
Population aged 25-44
66,896
Population aged 45-64
42,018
Population aged 65+

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

FIGURE 1

St. Clair County, IL population by age group.

The largest age group is 10 to 14 years with a population of 18,716 (7.29% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
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The largest age group in St. Clair County, IL was for the group of age 10 to 14 years with a population of 18,716 (7.29%), according to the 2018-2022 American Community Survey.

At the same time, the smallest age group in St. Clair County, IL was the 80 to 84 years with a population of 4,313 (1.68%).

St. Clair County, IL population by age cohort

To better understand the age distribution of St. Clair County, IL'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

St. Clair County, IL population by age cohort

The largest age group was 18 to 64 years with a population of 155,057 (60.38% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
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St. Clair County, IL population by age cohort

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

Age Group Population % of Total Population
Under 18 years 59,716 23.25%
18 to 64 years 155,057 60.38%
65 years and over 42,018 16.36%
Exploring St. Clair County's Diversity? Request Customized Data Now!

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

  • St. Clair County 's population under 18 was 23.25%, compared to the 22.11% nationwide.
  • St. Clair County's working population (between 18 and 64) was 60.38%, compared to 61.36% nationwide.
  • St. Clair County's elderly or the senior population (over 65 age) was 16.36% as compared to 16.53% nationwide.

St. Clair County, IL population pyramid

Population pyramid for St. Clair County, IL 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 St. Clair County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for St. Clair County, IL, is 29.8.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for St. Clair County, IL, is 25.4.
  • Total dependency ratio for St. Clair County, IL is 55.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for St. Clair County, IL is 3.9.

FIGURE 3

St. Clair County, IL population pyramid

St. Clair County 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.
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St. Clair County, IL population pyramid

Here's the St. Clair County, IL's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 7,923 7,514 15,437
5 to 9 years 7,813 7,352 15,165
10 to 14 years 9,662 9,054 18,716
15 to 19 years 8,633 8,157 16,790
20 to 24 years 7,947 7,489 15,436
25 to 29 years 8,187 8,212 16,399
30 to 34 years 7,905 8,573 16,478
35 to 39 years 7,736 8,378 16,114
40 to 44 years 8,459 8,883 17,342
45 to 49 years 7,444 7,951 15,395
50 to 54 years 7,675 8,322 15,997
55 to 59 years 8,592 9,063 17,655
60 to 64 years 8,594 9,255 17,849
65 to 69 years 6,744 7,099 13,843
70 to 74 years 5,124 6,422 11,546
75 to 79 years 3,006 4,107 7,113
80 to 84 years 1,442 2,871 4,313
85 years and over 1,978 3,225 5,203
Exploring St. Clair County's Diversity? Request Customized Data Now!

Things to know

What is the population of St. Clair County, IL under 18?

St. Clair County's population under the age of 18 is 59,716, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 23.25% of the total resident population of St. Clair County, IL.

What is the aging population in St. Clair County, IL?

St. Clair County's population aged 65 years and above was 42,018. As per the U.S. Census Bureau's American Community Survey, this population is 16.36% of the entire population.

References

Datasets

Explore datasets by year of publication.
2024
St. Clair County, IL Age Group Population Dataset: A Complete Breakdown of St. Clair County 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 St. Clair County 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 St. Clair County. The dataset can be utilized to understand the population distribution of St. Clair County by age. For example, using this dataset, we can identify the largest age group in St. Clair County.

Key observations

The largest age group in St. Clair County, IL was for the group of age 10 to 14 years years with a population of 18,716 (7.29%), according to the ACS 2018-2022 5-Year Estimates. At the same time, the smallest age group in St. Clair County, IL was the 80 to 84 years years with a population of 4,313 (1.68%). 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 St. Clair County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of St. Clair County 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 St. Clair County Population by Age. You can refer the same here

St. Clair County, IL Age Cohorts Dataset: Children, Working Adults, and Seniors in St. Clair County - 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 St. Clair County 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 St. Clair County. 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 155,057 (60.38% 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 St. Clair County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in St. Clair County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the St. Clair County 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 St. Clair County Population by Age. You can refer the same here

St. Clair County, IL 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 St. Clair County, IL population pyramid, which represents the St. Clair County 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 St. Clair County, IL, is 29.8.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for St. Clair County, IL, is 25.4.
  • Total dependency ratio for St. Clair County, IL is 55.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for St. Clair County, IL is 3.9.
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 St. Clair County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the St. Clair County for the selected age group is shown in the following column.
  • Population (Female): The female population in the St. Clair County for the selected age group is shown in the following column.
  • Total Population: The total population of the St. Clair County 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 St. Clair County 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

St. Clair County, IL Demographics St. Clair County, IL Population

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Collection 5 Resources