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St. Charles County, MO Population by Age

The median age in St. Charles County, MO is 39.6, as per 2019-2023 ACS 5 -Year Estimates. Of the total population, 18.62% were under the age of 15, 18.18% aged 15 to 29, 46.76% aged 30 to 64, 14.76% aged 65 to 84, and 1.67% were 85 years of age and older.
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By Neilsberg Research
Updated Feb 22, 2025

St. Charles County, MO population age distributions

A complete breakdown of St. Charles 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 22,538 5.5%
5 to 9 years 26,836 6.55%
10 to 14 years 26,940 6.57%
15 to 19 years 26,591 6.49%
20 to 24 years 23,863 5.82%
25 to 29 years 24,070 5.87%
30 to 34 years 26,851 6.55%
35 to 39 years 29,425 7.18%
40 to 44 years 28,398 6.93%
45 to 49 years 25,348 6.19%
50 to 54 years 26,053 6.36%
55 to 59 years 27,711 6.76%
60 to 64 years 27,817 6.79%
65 to 69 years 22,595 5.51%
70 to 74 years 17,724 4.32%
75 to 79 years 12,136 2.96%
80 to 84 years 8,093 1.97%
85 years and over 6,841 1.67%
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St. Charles County, MO population by age group

Key stats
126,768
Population under 25 years
108,744
Population aged 25-44
106,929
Population aged 45-64
67,389
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2019-2023

FIGURE 1

St. Charles County, MO population by age group.

The largest age group is 35 to 39 years with a population of 29,425 (7.18% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.
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The largest age group in St. Charles County, MO was for the group of age 35 to 39 years with a population of 29,425 (7.18%), according to the 2019-2023 American Community Survey.

At the same time, the smallest age group in St. Charles County, MO was the 85 years and over with a population of 6,841 (1.67%).

St. Charles County, MO population by age cohort

To better understand the age distribution of St. Charles County, MO'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. Charles County, MO population by age cohort

The largest age group was 18 to 64 years with a population of 248,899 (60.73% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.
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St. Charles County, MO population by age cohort

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

Age Group Population % of Total Population
Under 18 years 93,542 22.82%
18 to 64 years 248,899 60.73%
65 years and over 67,389 16.44%
Exploring St. Charles 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. Charles County 's population under 18 was 22.82%, compared to the 22.16% nationwide.
  • St. Charles County's working population (between 18 and 64) was 60.73%, compared to 61% nationwide.
  • St. Charles County's elderly or the senior population (over 65 age) was 16.44% as compared to 16.84% nationwide.

St. Charles County, MO population pyramid

Population pyramid for St. Charles County, MO 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. Charles County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for St. Charles County, MO, is 28.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for St. Charles County, MO, is 25.3.
  • Total dependency ratio for St. Charles County, MO is 54.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for St. Charles County, MO is 3.9.

FIGURE 3

St. Charles County, MO population pyramid

St. Charles 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) 2019-2023 5-Year Estimates.
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St. Charles County, MO population pyramid

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 11,531 11,007 22,538
5 to 9 years 13,781 13,055 26,836
10 to 14 years 13,735 13,205 26,940
15 to 19 years 13,616 12,975 26,591
20 to 24 years 12,203 11,660 23,863
25 to 29 years 12,241 11,829 24,070
30 to 34 years 13,413 13,438 26,851
35 to 39 years 15,057 14,368 29,425
40 to 44 years 14,142 14,256 28,398
45 to 49 years 12,705 12,643 25,348
50 to 54 years 12,926 13,127 26,053
55 to 59 years 13,456 14,255 27,711
60 to 64 years 13,785 14,032 27,817
65 to 69 years 10,492 12,103 22,595
70 to 74 years 8,319 9,405 17,724
75 to 79 years 5,374 6,762 12,136
80 to 84 years 3,087 5,006 8,093
85 years and over 2,797 4,044 6,841
Exploring St. Charles County's Diversity? Request Customized Data Now!

Things to know

What is the population of St. Charles County, MO under 18?

St. Charles County's population under the age of 18 is 93,542, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.82% of the total resident population of St. Charles County, MO.

What is the aging population in St. Charles County, MO?

St. Charles County's population aged 65 years and above was 67,389. As per the U.S. Census Bureau's American Community Survey, this population is 16.44% of the entire population.

References

Datasets

Explore datasets by year of publication.
2025
St. Charles County, MO Age Group Population Dataset: A Complete Breakdown of St. Charles County Age Demographics from 0 to 85 Years and Over, Distributed Across 18 Age Groups // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

The dataset tabulates the St. Charles 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. Charles County. The dataset can be utilized to understand the population distribution of St. Charles County by age. For example, using this dataset, we can identify the largest age group in St. Charles County.

Key observations

The largest age group in St. Charles County, MO was for the group of age 35 to 39 years years with a population of 29,425 (7.18%), according to the ACS 2019-2023 5-Year Estimates. At the same time, the smallest age group in St. Charles County, MO was the 85 years and over years with a population of 6,841 (1.67%). Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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. Charles County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of St. Charles 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. Charles County Population by Age. You can refer the same here

St. Charles County, MO Age Cohorts Dataset: Children, Working Adults, and Seniors in St. Charles County - Population and Percentage Analysis // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

The dataset tabulates the St. Charles 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. Charles 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 248,899 (60.73% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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. Charles County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in St. Charles County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the St. Charles 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. Charles County Population by Age. You can refer the same here

St. Charles County, MO Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the St. Charles County, MO population pyramid, which represents the St. Charles County population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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. Charles County, MO, is 28.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for St. Charles County, MO, is 25.3.
  • Total dependency ratio for St. Charles County, MO is 54.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for St. Charles County, MO is 3.9.
Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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. Charles 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. Charles County for the selected age group is shown in the following column.
  • Population (Female): The female population in the St. Charles County for the selected age group is shown in the following column.
  • Total Population: The total population of the St. Charles 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. Charles 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. Charles County, MO Demographics St. Charles County, MO Population

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Collection 5 Resources