Seattle, WA Population by Age

The median age in Seattle, WA is 35.3, as per 2021 ACS 5-Year Estimates. Of the total population, 12.48% were under the age of 15, 25.16% aged 15 to 29, 50.04% aged 30 to 64, 10.78% aged 65 to 84, and 1.54% were 85 years of age and older.
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Updated Sep 17, 2023

Seattle, WA population age distribution

A complete breakdown of Seattle'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 33,592 4.63%
5 to 9 years 29,024 4%
10 to 14 years 27,996 3.86%
15 to 19 years 32,281 4.45%
20 to 24 years 56,204 7.74%
25 to 29 years 94,191 12.97%
30 to 34 years 85,891 11.83%
35 to 39 years 64,160 8.84%
40 to 44 years 50,208 6.92%
45 to 49 years 47,017 6.48%
50 to 54 years 42,198 5.81%
55 to 59 years 38,973 5.37%
60 to 64 years 34,856 4.8%
65 to 69 years 31,367 4.32%
70 to 74 years 24,478 3.37%
75 to 79 years 13,440 1.85%
80 to 84 years 8,968 1.24%
85 years and over 11,210 1.54%
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Seattle, WA population by age group

Key stats
179,097
Population under 25 years
294,450
Population aged 25-44
163,044
Population aged 45-64
89,463
Population aged 65+

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

The graph shows Seattle'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
Seattle, WA population by age group. The largest age group was 25-29 years with a poulation of 94,191 (12.97% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Seattle, WA was for the group of age 25-29 years with a population of 94,191 (12.97%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Seattle, WA was the 80-84 years with a population of 8,968 (1.24%).

Seattle, WA population by age cohort

To better understand the age distribution of Seattle, WA'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 Seattle'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.
Seattle, WA 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 531,256 (73.17% 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 105,335 14.51%
18 to 64 years 531,256 73.17%
85 years and over 89,463 12.32%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Seattle's population under 18 was 14.51%, compared to the 22.51% nationwide.
  • Seattle's working population (between 18 and 64) was 73.17%, compared to 61.45% nationwide.
  • Seattle's elderly or the senior population (over 65 age) was 12.32% as compared to 16.04% nationwide.

Seattle, WA population pyramid

Population pyramid for Seattle, WA 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 Seattle's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Seattle, WA, is 16.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Seattle, WA, is 16.4.
  • Total dependency ratio for Seattle, WA is 33.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Seattle, WA is 6.1.
The graph shows Seattle'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.
Seattle, WA population pyramid i.e. Seattle population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Seattle, WA's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 16,469 17,123 33,592
5 to 9 years 14,533 14,491 29,024
10 to 14 years 14,539 13,457 27,996
15 to 19 years 15,491 16,790 32,281
20 to 24 years 26,513 29,691 56,204
25 to 29 years 49,523 44,668 94,191
30 to 34 years 45,771 40,120 85,891
35 to 39 years 34,235 29,925 64,160
40 to 44 years 26,206 24,002 50,208
45 to 49 years 24,058 22,959 47,017
50 to 54 years 22,446 19,752 42,198
55 to 59 years 20,525 18,448 38,973
60 to 64 years 17,375 17,481 34,856
65 to 69 years 15,554 15,813 31,367
70 to 74 years 11,143 13,335 24,478
75 to 79 years 6,147 7,293 13,440
80 to 84 years 3,824 5,144 8,968
85 years and over 3,757 7,453 11,210
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Things to know

What is the population of Seattle, WA under 18?

Seattle's population under the age of 18 is 105,335, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 14.51% of the total resident population of Seattle, WA.

What is the aging population in Seattle, WA?

Seattle's population aged 65 years and above was 89,463. As per the U.S. Census Bureau's American Community Survey, this population is 12.32% of the entire population.

References

Datasets

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

Key observations

The largest age group in Seattle, WA was for the group of age 25-29 years with a population of 94,191 (12.97%), according to the 2021 American Community Survey. At the same time, the smallest age group in Seattle, WA was the 80-84 years with a population of 8,968 (1.24%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Seattle, WA Age Cohorts Dataset: Children, Working Adults, and Seniors in Seattle - 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 Seattle 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 Seattle. 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.

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

Seattle, WA 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 Seattle, WA population pyramid, which represents the Seattle 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 Seattle, WA, is 16.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Seattle, WA, is 16.4.
  • Total dependency ratio for Seattle, WA is 33.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Seattle, WA is 6.1.

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

About the author

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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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