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Nassau County, NY Population by Age

The median age in Nassau County, NY is 41.8, as per 2021 ACS 5-Year Estimates. Of the total population, 17.71% were under the age of 15, 18.46% aged 15 to 29, 46.11% aged 30 to 64, 14.95% aged 65 to 84, and 2.78% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Nassau County, NY population age distribution

A complete breakdown of Nassau 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 75,085 5.4%
5 to 9 years 84,350 6.06%
10 to 14 years 86,988 6.25%
15 to 19 years 89,246 6.41%
20 to 24 years 85,653 6.15%
25 to 29 years 81,984 5.89%
30 to 34 years 79,079 5.68%
35 to 39 years 82,445 5.92%
40 to 44 years 86,989 6.25%
45 to 49 years 90,776 6.52%
50 to 54 years 100,495 7.22%
55 to 59 years 104,103 7.48%
60 to 64 years 97,750 7.02%
65 to 69 years 78,792 5.66%
70 to 74 years 61,886 4.45%
75 to 79 years 40,068 2.88%
80 to 84 years 27,349 1.97%
85 years and over 38,640 2.78%
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TABLE OF CONTENTS

Nassau County, NY population by age group

Key stats
421,322
Population under 25 years
330,497
Population aged 25-44
393,124
Population aged 45-64
246,735
Population aged 65+

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

The graph shows Nassau 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
Nassau County, NY population by age group. The largest age group was 55-59 years with a poulation of 104,103 (7.48% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Nassau County, NY was for the group of age 55-59 years with a population of 104,103 (7.48%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Nassau County, NY was the 80-84 years with a population of 27,349 (1.97%).

Nassau County, NY population by age cohort

To better understand the age distribution of Nassau 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
The pie chart shows Nassau 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.
Nassau County, NY 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 842,848 (60.56% 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 302,095 21.71%
18 to 64 years 842,848 60.56%
85 years and over 246,735 17.73%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Nassau County's population under 18 was 21.71%, compared to the 22.51% nationwide.
  • Nassau County's working population (between 18 and 64) was 60.56%, compared to 61.45% nationwide.
  • Nassau County's elderly or the senior population (over 65 age) was 17.73% as compared to 16.04% nationwide.

Nassau County, NY population pyramid

Population pyramid for Nassau 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 Nassau County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Nassau County, NY, is 27.4.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Nassau County, NY, is 27.5.
  • Total dependency ratio for Nassau County, NY is 54.9.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Nassau County, NY is 3.6.
The graph shows Nassau 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.
Nassau County, NY population pyramid i.e. Nassau County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Nassau County, NY's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 38,579 36,506 75,085
5 to 9 years 43,237 41,113 84,350
10 to 14 years 44,881 42,107 86,988
15 to 19 years 46,047 43,199 89,246
20 to 24 years 43,421 42,232 85,653
25 to 29 years 41,719 40,265 81,984
30 to 34 years 39,601 39,478 79,079
35 to 39 years 40,743 41,702 82,445
40 to 44 years 43,537 43,452 86,989
45 to 49 years 44,801 45,975 90,776
50 to 54 years 49,084 51,411 100,495
55 to 59 years 50,834 53,269 104,103
60 to 64 years 47,503 50,247 97,750
65 to 69 years 37,811 40,981 78,792
70 to 74 years 28,876 33,010 61,886
75 to 79 years 17,981 22,087 40,068
80 to 84 years 11,269 16,080 27,349
85 years and over 12,984 25,656 38,640
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Things to know

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

Nassau County's population under the age of 18 is 302,095, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.71% of the total resident population of Nassau County, NY.

What is the aging population in Nassau County, NY?

Nassau County's population aged 65 years and above was 246,735. As per the U.S. Census Bureau's American Community Survey, this population is 17.73% of the entire population.

References

Datasets

Nassau County, NY Age Group Population Dataset: A complete breakdown of Nassau County age demographics from 0 to 85 years, distributed across 18 age groups
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

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

Key observations

The largest age group in Nassau County, NY was for the group of age 55-59 years with a population of 104,103 (7.48%), according to the 2021 American Community Survey. At the same time, the smallest age group in Nassau County, NY was the 80-84 years with a population of 27,349 (1.97%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Nassau County, NY Age Cohorts Dataset: Children, Working Adults, and Seniors in Nassau County - Population and Percentage Analysis
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the Nassau 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 Nassau 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.

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

Nassau County, NY Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Nassau County, NY population pyramid, which represents the Nassau 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 Nassau County, NY, is 27.4.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Nassau County, NY, is 27.5.
  • Total dependency ratio for Nassau County, NY is 54.9.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Nassau County, NY is 3.6.

Nassau 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 Nassau County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Nassau County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Nassau County for the selected age group is shown in the following column.
  • Total Population: The total population of the Nassau 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 Nassau County Population by Age. You can refer the same here

Explore related topics

Nassau County, NY Demographics Nassau 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