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Collection 5 Resources

Greenwich, Connecticut Population by Age

The median age in Greenwich, Connecticut is 42.9, as per 2021 ACS 5-Year Estimates. Of the total population, 20.98% were under the age of 15, 15.02% aged 15 to 29, 47.16% aged 30 to 64, 14.59% aged 65 to 84, and 2.25% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Greenwich, Connecticut population age distribution

A complete breakdown of Greenwich town'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 3,321 5.23%
5 to 9 years 4,886 7.7%
10 to 14 years 5,105 8.05%
15 to 19 years 4,896 7.72%
20 to 24 years 2,534 3.99%
25 to 29 years 2,101 3.31%
30 to 34 years 2,611 4.11%
35 to 39 years 3,450 5.44%
40 to 44 years 4,531 7.14%
45 to 49 years 5,121 8.07%
50 to 54 years 5,105 8.05%
55 to 59 years 4,797 7.56%
60 to 64 years 4,312 6.8%
65 to 69 years 3,408 5.37%
70 to 74 years 2,599 4.1%
75 to 79 years 1,844 2.91%
80 to 84 years 1,408 2.22%
85 years and over 1,426 2.25%
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TABLE OF CONTENTS

Greenwich, Connecticut population by age group

Key stats
20,742
Population under 25 years
12,693
Population aged 25-44
19,335
Population aged 45-64
10,685
Population aged 65+

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

The graph shows Greenwich town'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
Greenwich, Connecticut population by age group. The largest age group was 45-49 years with a poulation of 5,121 (8.07% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Greenwich, Connecticut was for the group of age 45-49 years with a population of 5,121 (8.07%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Greenwich, Connecticut was the 80-84 years with a population of 1,408 (2.22%).

Greenwich, Connecticut population by age cohort

To better understand the age distribution of Greenwich, Connecticut'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 Greenwich town'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.
Greenwich, Connecticut 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 36,029 (56.78% 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 16,741 26.38%
18 to 64 years 36,029 56.78%
85 years and over 10,685 16.84%
Exploring Greenwich town's Diversity? Request Customized Data Now!

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

  • Greenwich town's population under 18 was 26.38%, compared to the 22.51% nationwide.
  • Greenwich town's working population (between 18 and 64) was 56.78%, compared to 61.45% nationwide.
  • Greenwich town's elderly or the senior population (over 65 age) was 16.84% as compared to 16.04% nationwide.

Greenwich, Connecticut population pyramid

Population pyramid for Greenwich, Connecticut 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 Greenwich town's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Greenwich, Connecticut, is 33.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Greenwich, Connecticut, is 27.1.
  • Total dependency ratio for Greenwich, Connecticut is 60.8.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Greenwich, Connecticut is 3.7.
The graph shows Greenwich town'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.
Greenwich, Connecticut population pyramid i.e. Greenwich town population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Greenwich, Connecticut's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 1,724 1,597 3,321
5 to 9 years 2,529 2,357 4,886
10 to 14 years 2,558 2,547 5,105
15 to 19 years 2,534 2,362 4,896
20 to 24 years 1,262 1,272 2,534
25 to 29 years 1,218 883 2,101
30 to 34 years 1,272 1,339 2,611
35 to 39 years 1,492 1,958 3,450
40 to 44 years 2,169 2,362 4,531
45 to 49 years 2,429 2,692 5,121
50 to 54 years 2,372 2,733 5,105
55 to 59 years 2,359 2,438 4,797
60 to 64 years 2,257 2,055 4,312
65 to 69 years 1,594 1,814 3,408
70 to 74 years 1,263 1,336 2,599
75 to 79 years 774 1,070 1,844
80 to 84 years 533 875 1,408
85 years and over 528 898 1,426
Exploring Greenwich town's Diversity? Request Customized Data Now!

Things to know

What is the population of Greenwich, Connecticut under 18?

Greenwich town's population under the age of 18 is 16,741, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 26.38% of the total resident population of Greenwich, Connecticut.

What is the aging population in Greenwich, Connecticut?

Greenwich town's population aged 65 years and above was 10,685. As per the U.S. Census Bureau's American Community Survey, this population is 16.84% of the entire population.

References

Datasets

Explore datasets by year of publication.
2023
Greenwich, Connecticut Age Group Population Dataset: A complete breakdown of Greenwich town 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 Greenwich town 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 Greenwich town. The dataset can be utilized to understand the population distribution of Greenwich town by age. For example, using this dataset, we can identify the largest age group in Greenwich town.

Key observations

The largest age group in Greenwich, Connecticut was for the group of age 45-49 years with a population of 5,121 (8.07%), according to the 2021 American Community Survey. At the same time, the smallest age group in Greenwich, Connecticut was the 80-84 years with a population of 1,408 (2.22%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Greenwich town 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 Greenwich town is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Greenwich town 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 Greenwich town Population by Age. You can refer the same here

Greenwich, Connecticut Age Cohorts Dataset: Children, Working Adults, and Seniors in Greenwich town - 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 Greenwich town 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 Greenwich town. 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.

Greenwich town 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 Greenwich town population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Greenwich town is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Greenwich town 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 Greenwich town Population by Age. You can refer the same here

Greenwich, Connecticut 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 Greenwich, Connecticut population pyramid, which represents the Greenwich town 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 Greenwich, Connecticut, is 33.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Greenwich, Connecticut, is 27.1.
  • Total dependency ratio for Greenwich, Connecticut is 60.8.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Greenwich, Connecticut is 3.7.

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

Greenwich, Connecticut Demographics Greenwich, Connecticut Population

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Neilsberg Research
Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.
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Collection 5 Resources