Download
Share
Contents
Save
Collection 5 Resources

Fairfield County, CT Population by Age

The median age in Fairfield County, CT is 40.7, as per 2021 ACS 5-Year Estimates. Of the total population, 18.21% were under the age of 15, 18.89% aged 15 to 29, 47.07% aged 30 to 64, 13.46% aged 65 to 84, and 2.37% were 85 years of age and older.
Neilsberg Research Avatar
By Neilsberg Research
Updated Sep 17, 2023

Fairfield County, CT population age distribution

A complete breakdown of Fairfield 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 51,434 5.38%
5 to 9 years 57,243 5.98%
10 to 14 years 65,500 6.85%
15 to 19 years 67,324 7.04%
20 to 24 years 59,983 6.27%
25 to 29 years 53,400 5.58%
30 to 34 years 55,581 5.81%
35 to 39 years 58,664 6.13%
40 to 44 years 62,312 6.51%
45 to 49 years 65,548 6.85%
50 to 54 years 71,989 7.53%
55 to 59 years 72,231 7.55%
60 to 64 years 63,852 6.68%
65 to 69 years 47,436 4.96%
70 to 74 years 38,220 4%
75 to 79 years 25,801 2.7%
80 to 84 years 17,278 1.81%
85 years and over 22,650 2.37%
Exploring Fairfield County's Diversity? Request Customized Data Now!

TABLE OF CONTENTS

Fairfield County, CT population by age group

Key stats
301,484
Population under 25 years
229,957
Population aged 25-44
273,620
Population aged 45-64
151,385
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The graph shows Fairfield County's population by age group, with age group on x-axis and the respective age group's percent of the total population on y-axis
Fairfield County, CT population by age group. The largest age group was 55-59 years with a poulation of 72,231 (7.55% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Fairfield County, CT was for the group of age 55-59 years with a population of 72,231 (7.55%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Fairfield County, CT was the 80-84 years with a population of 17,278 (1.81%).

Fairfield County, CT population by age cohort

To better understand the age distribution of Fairfield County, CT'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
The pie chart shows Fairfield County's population divided into segments, with each segment representing an age cohort. The area of each segment is in the same proportion of a circle as the population of the cohort is of the total population.
Fairfield County, CT population by age cohorts (Children: Under 18 years; Working population: 18-64 years; Senior population: 65 years or more). The largest age group was 18 - 64 years with a poulation of 590,133 (61.70% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population % of Total Population
Under 18 years 214,928 22.47%
18 to 64 years 590,133 61.7%
85 years and over 151,385 15.83%
Exploring Fairfield 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:

  • Fairfield County's population under 18 was 22.47%, compared to the 22.51% nationwide.
  • Fairfield County's working population (between 18 and 64) was 61.70%, compared to 61.45% nationwide.
  • Fairfield County's elderly or the senior population (over 65 age) was 15.83% as compared to 16.04% nationwide.

Fairfield County, CT population pyramid

Population pyramid for Fairfield County, CT 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 Fairfield County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Fairfield County, CT, is 27.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Fairfield County, CT, is 24.0.
  • Total dependency ratio for Fairfield County, CT is 51.6.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Fairfield County, CT is 4.2.
The graph shows Fairfield County's population across different age group and gender, with population on x-axis and population y-axis. The male population is plotted on the left in blue color whereas the female population is plotted on the right in pink color.
Fairfield County, CT population pyramid i.e. Fairfield County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Fairfield County, CT's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 26,298 25,136 51,434
5 to 9 years 29,210 28,033 57,243
10 to 14 years 33,120 32,380 65,500
15 to 19 years 34,214 33,110 67,324
20 to 24 years 30,509 29,474 59,983
25 to 29 years 27,137 26,263 53,400
30 to 34 years 27,568 28,013 55,581
35 to 39 years 29,108 29,556 58,664
40 to 44 years 30,781 31,531 62,312
45 to 49 years 32,085 33,463 65,548
50 to 54 years 35,248 36,741 71,989
55 to 59 years 34,309 37,922 72,231
60 to 64 years 32,121 31,731 63,852
65 to 69 years 22,413 25,023 47,436
70 to 74 years 17,896 20,324 38,220
75 to 79 years 11,534 14,267 25,801
80 to 84 years 7,264 10,014 17,278
85 years and over 7,633 15,017 22,650
Exploring Fairfield County's Diversity? Request Customized Data Now!

Things to know

What is the population of Fairfield County, CT under 18?

Fairfield County's population under the age of 18 is 214,928, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.47% of the total resident population of Fairfield County, CT.

What is the aging population in Fairfield County, CT?

Fairfield County's population aged 65 years and above was 151,385. As per the U.S. Census Bureau's American Community Survey, this population is 15.83% of the entire population.

References

Datasets

Explore datasets by year of publication.
2023
Fairfield County, CT Age Group Population Dataset: A complete breakdown of Fairfield County age demographics from 0 to 85 years, distributed across 18 age groups
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

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

Key observations

The largest age group in Fairfield County, CT was for the group of age 55-59 years with a population of 72,231 (7.55%), according to the 2021 American Community Survey. At the same time, the smallest age group in Fairfield County, CT was the 80-84 years with a population of 17,278 (1.81%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Fairfield County population by age group

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 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 Fairfield County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Fairfield 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 Fairfield County Population by Age. You can refer the same here

Fairfield County, CT Age Cohorts Dataset: Children, Working Adults, and Seniors in Fairfield County - Population and Percentage Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the Fairfield 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 Fairfield 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 $b3_v1 with a poulation of $b3_v2 ($b3_v3 of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Fairfield County population by age cohort

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 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 Fairfield County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Fairfield County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Fairfield 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 Fairfield County Population by Age. You can refer the same here

Fairfield County, CT Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Fairfield County, CT population pyramid, which represents the Fairfield County population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey 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 Fairfield County, CT, is 27.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Fairfield County, CT, is 24.0.
  • Total dependency ratio for Fairfield County, CT is 51.6.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Fairfield County, CT is 4.2.

Fairfield County population pyramid

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 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 Fairfield County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Fairfield County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Fairfield County for the selected age group is shown in the following column.
  • Total Population: The total population of the Fairfield 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 Fairfield 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

Fairfield County, CT Demographics Fairfield County, CT 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