Suffolk County, NY Population by Age

The median age in Suffolk County, NY is 41.7, as per 2021 ACS 5-Year Estimates. Of the total population, 17.10% were under the age of 15, 19.10% aged 15 to 29, 46.88% aged 30 to 64, 14.62% aged 65 to 84, and 2.30% were 85 years of age and older.
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Updated Sep 17, 2023

Suffolk County, NY population age distribution

A complete breakdown of Suffolk 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 80,164 5.26%
5 to 9 years 83,087 5.46%
10 to 14 years 97,219 6.38%
15 to 19 years 100,677 6.61%
20 to 24 years 97,016 6.37%
25 to 29 years 93,236 6.12%
30 to 34 years 86,831 5.7%
35 to 39 years 90,069 5.91%
40 to 44 years 90,016 5.91%
45 to 49 years 102,418 6.72%
50 to 54 years 117,761 7.73%
55 to 59 years 118,648 7.79%
60 to 64 years 108,178 7.1%
65 to 69 years 79,441 5.22%
70 to 74 years 69,140 4.54%
75 to 79 years 45,092 2.96%
80 to 84 years 29,039 1.91%
85 years and over 34,966 2.3%
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Suffolk County, NY population by age group

Key stats
458,163
Population under 25 years
360,152
Population aged 25-44
447,005
Population aged 45-64
257,678
Population aged 65+

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

The graph shows Suffolk 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
Suffolk County, NY population by age group. The largest age group was 55-59 years with a poulation of 118,648 (7.79% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Suffolk County, NY was for the group of age 55-59 years with a population of 118,648 (7.79%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Suffolk County, NY was the 80-84 years with a population of 29,039 (1.91%).

Suffolk County, NY population by age cohort

To better understand the age distribution of Suffolk 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 Suffolk 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.
Suffolk 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 943,079 (61.92% 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 322,241 21.16%
18 to 64 years 943,079 61.92%
85 years and over 257,678 16.92%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Suffolk County's population under 18 was 21.16%, compared to the 22.51% nationwide.
  • Suffolk County's working population (between 18 and 64) was 61.92%, compared to 61.45% nationwide.
  • Suffolk County's elderly or the senior population (over 65 age) was 16.92% as compared to 16.04% nationwide.

Suffolk County, NY population pyramid

Population pyramid for Suffolk 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 Suffolk County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Suffolk County, NY, is 25.9.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Suffolk County, NY, is 25.6.
  • Total dependency ratio for Suffolk County, NY is 51.6.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Suffolk County, NY is 3.9.
The graph shows Suffolk 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.
Suffolk County, NY population pyramid i.e. Suffolk County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 40,651 39,513 80,164
5 to 9 years 42,394 40,693 83,087
10 to 14 years 49,944 47,275 97,219
15 to 19 years 51,764 48,913 100,677
20 to 24 years 49,392 47,624 97,016
25 to 29 years 48,000 45,236 93,236
30 to 34 years 44,489 42,342 86,831
35 to 39 years 45,953 44,116 90,069
40 to 44 years 45,047 44,969 90,016
45 to 49 years 50,863 51,555 102,418
50 to 54 years 58,465 59,296 117,761
55 to 59 years 59,891 58,757 118,648
60 to 64 years 52,714 55,464 108,178
65 to 69 years 38,648 40,793 79,441
70 to 74 years 31,437 37,703 69,140
75 to 79 years 19,770 25,322 45,092
80 to 84 years 12,608 16,431 29,039
85 years and over 11,877 23,089 34,966
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Things to know

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

Suffolk County's population under the age of 18 is 322,241, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.16% of the total resident population of Suffolk County, NY.

What is the aging population in Suffolk County, NY?

Suffolk County's population aged 65 years and above was 257,678. As per the U.S. Census Bureau's American Community Survey, this population is 16.92% of the entire population.

References

Datasets

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

Key observations

The largest age group in Suffolk County, NY was for the group of age 55-59 years with a population of 118,648 (7.79%), according to the 2021 American Community Survey. At the same time, the smallest age group in Suffolk County, NY was the 80-84 years with a population of 29,039 (1.91%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Suffolk County, NY Age Cohorts Dataset: Children, Working Adults, and Seniors in Suffolk 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 Suffolk 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 Suffolk 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.

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

Suffolk County, NY 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 Suffolk County, NY population pyramid, which represents the Suffolk 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 Suffolk County, NY, is 25.9.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Suffolk County, NY, is 25.6.
  • Total dependency ratio for Suffolk County, NY is 51.6.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Suffolk County, NY is 3.9.

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

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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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