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Westchester County, NY Population by Age

The median age in Westchester County, NY is 41.5, as per 2019-2023 ACS 5 -Year Estimates. Of the total population, 17.49% were under the age of 15, 18.18% aged 15 to 29, 46.60% aged 30 to 64, 15.01% aged 65 to 84, and 2.71% were 85 years of age and older.
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By Neilsberg Research
Updated Feb 22, 2025

Westchester County, NY population age distributions

A complete breakdown of Westchester 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 53,282 5.34%
5 to 9 years 57,324 5.75%
10 to 14 years 63,818 6.4%
15 to 19 years 65,962 6.62%
20 to 24 years 59,300 5.95%
25 to 29 years 55,969 5.61%
30 to 34 years 58,337 5.85%
35 to 39 years 62,975 6.32%
40 to 44 years 67,236 6.74%
45 to 49 years 66,381 6.66%
50 to 54 years 71,511 7.17%
55 to 59 years 69,699 6.99%
60 to 64 years 68,466 6.87%
65 to 69 years 53,409 5.36%
70 to 74 years 44,964 4.51%
75 to 79 years 29,763 2.99%
80 to 84 years 21,440 2.15%
85 years and over 27,052 2.71%
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Westchester County, NY population by age group

Key stats
299,686
Population under 25 years
244,517
Population aged 25-44
276,057
Population aged 45-64
176,628
Population aged 65+

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

FIGURE 1

Westchester County, NY population by age group.

The largest age group is 50 to 54 years with a population of 71,511 (7.17% 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 Westchester County, NY was for the group of age 50 to 54 years with a population of 71,511 (7.17%), according to the 2019-2023 American Community Survey.

At the same time, the smallest age group in Westchester County, NY was the 80 to 84 years with a population of 21,440 (2.15%).

Westchester County, NY population by age cohort

To better understand the age distribution of Westchester County, NY'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

Westchester County, NY population by age cohort

The largest age group was 18 to 64 years with a population of 605,521 (60.74% of the total population).

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

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

Age Group Population % of Total Population
Under 18 years 214,739 21.54%
18 to 64 years 605,521 60.74%
65 years and over 176,628 17.72%
Exploring Westchester 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:

  • Westchester County 's population under 18 was 21.54%, compared to the 22.16% nationwide.
  • Westchester County's working population (between 18 and 64) was 60.74%, compared to 61% nationwide.
  • Westchester County's elderly or the senior population (over 65 age) was 17.72% as compared to 16.84% nationwide.

Westchester County, NY population pyramid

Population pyramid for Westchester County, NY 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 Westchester County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Westchester County, NY, is 27.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Westchester County, NY, is 27.3.
  • Total dependency ratio for Westchester County, NY is 54.4.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Westchester County, NY is 3.7.

FIGURE 3

Westchester County, NY population pyramid

Westchester 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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Westchester County, NY population pyramid

Here's the Westchester County, NY's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 27,284 25,998 53,282
5 to 9 years 29,502 27,822 57,324
10 to 14 years 33,032 30,786 63,818
15 to 19 years 33,511 32,451 65,962
20 to 24 years 29,480 29,820 59,300
25 to 29 years 28,060 27,909 55,969
30 to 34 years 29,288 29,049 58,337
35 to 39 years 31,204 31,771 62,975
40 to 44 years 33,439 33,797 67,236
45 to 49 years 32,626 33,755 66,381
50 to 54 years 35,072 36,439 71,511
55 to 59 years 33,334 36,365 69,699
60 to 64 years 33,814 34,652 68,466
65 to 69 years 25,071 28,338 53,409
70 to 74 years 20,577 24,387 44,964
75 to 79 years 12,668 17,095 29,763
80 to 84 years 8,765 12,675 21,440
85 years and over 9,258 17,794 27,052
Exploring Westchester County's Diversity? Request Customized Data Now!

Things to know

What is the population of Westchester County, NY under 18?

Westchester County's population under the age of 18 is 214,739, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.54% of the total resident population of Westchester County, NY.

What is the aging population in Westchester County, NY?

Westchester County's population aged 65 years and above was 176,628. As per the U.S. Census Bureau's American Community Survey, this population is 17.72% of the entire population.

References

Datasets

Explore datasets by year of publication.
2025
Westchester County, NY Age Group Population Dataset: A Complete Breakdown of Westchester 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 Westchester 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 Westchester County. The dataset can be utilized to understand the population distribution of Westchester County by age. For example, using this dataset, we can identify the largest age group in Westchester County.

Key observations

The largest age group in Westchester County, NY was for the group of age 50 to 54 years years with a population of 71,511 (7.17%), according to the ACS 2019-2023 5-Year Estimates. At the same time, the smallest age group in Westchester County, NY was the 80 to 84 years years with a population of 21,440 (2.15%). 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 Westchester County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Westchester 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 Westchester County Population by Age. You can refer the same here

Westchester County, NY Age Cohorts Dataset: Children, Working Adults, and Seniors in Westchester 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 Westchester 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 Westchester 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 605,521 (60.74% 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 Westchester County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Westchester County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Westchester 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 Westchester County Population by Age. You can refer the same here

Westchester County, NY 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 Westchester County, NY population pyramid, which represents the Westchester 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 Westchester County, NY, is 27.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Westchester County, NY, is 27.3.
  • Total dependency ratio for Westchester County, NY is 54.4.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Westchester County, NY is 3.7.
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 Westchester County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Westchester County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Westchester County for the selected age group is shown in the following column.
  • Total Population: The total population of the Westchester 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 Westchester 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

Westchester County, NY Demographics Westchester County, NY 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