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Snohomish County, WA Population by Age

The median age in Snohomish County, WA is 38.2, as per 2021 ACS 5-Year Estimates. Of the total population, 18.90% were under the age of 15, 18.25% aged 15 to 29, 49.29% aged 30 to 64, 12.07% aged 65 to 84, and 1.50% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Snohomish County, WA population age distribution

A complete breakdown of Snohomish 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 50,882 6.2%
5 to 9 years 51,071 6.23%
10 to 14 years 53,000 6.46%
15 to 19 years 47,162 5.75%
20 to 24 years 45,325 5.53%
25 to 29 years 57,146 6.97%
30 to 34 years 63,738 7.77%
35 to 39 years 63,660 7.76%
40 to 44 years 56,952 6.95%
45 to 49 years 54,870 6.69%
50 to 54 years 55,183 6.73%
55 to 59 years 54,831 6.69%
60 to 64 years 54,954 6.7%
65 to 69 years 42,292 5.16%
70 to 74 years 28,651 3.49%
75 to 79 years 17,872 2.18%
80 to 84 years 10,131 1.24%
85 years and over 12,304 1.5%
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TABLE OF CONTENTS

Snohomish County, WA population by age group

Key stats
247,440
Population under 25 years
241,496
Population aged 25-44
219,838
Population aged 45-64
111,250
Population aged 65+

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

The graph shows Snohomish 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
Snohomish County, WA population by age group. The largest age group was 30-34 years with a poulation of 63,738 (7.77% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Snohomish County, WA was for the group of age 30-34 years with a population of 63,738 (7.77%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Snohomish County, WA was the 80-84 years with a population of 10,131 (1.24%).

Snohomish County, WA population by age cohort

To better understand the age distribution of Snohomish County, 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 Snohomish 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.
Snohomish County, 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 523,102 (63.79% 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 185,672 22.64%
18 to 64 years 523,102 63.79%
85 years and over 111,250 13.57%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Snohomish County's population under 18 was 22.64%, compared to the 22.51% nationwide.
  • Snohomish County's working population (between 18 and 64) was 63.79%, compared to 61.45% nationwide.
  • Snohomish County's elderly or the senior population (over 65 age) was 13.57% as compared to 16.04% nationwide.

Snohomish County, WA population pyramid

Population pyramid for Snohomish County, 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 Snohomish County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Snohomish County, WA, is 28.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Snohomish County, WA, is 20.1.
  • Total dependency ratio for Snohomish County, WA is 48.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Snohomish County, WA is 5.0.
The graph shows Snohomish 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.
Snohomish County, WA population pyramid i.e. Snohomish County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 26,058 24,824 50,882
5 to 9 years 26,278 24,793 51,071
10 to 14 years 27,296 25,704 53,000
15 to 19 years 24,202 22,960 47,162
20 to 24 years 23,380 21,945 45,325
25 to 29 years 29,310 27,836 57,146
30 to 34 years 32,420 31,318 63,738
35 to 39 years 32,591 31,069 63,660
40 to 44 years 29,874 27,078 56,952
45 to 49 years 28,121 26,749 54,870
50 to 54 years 28,379 26,804 55,183
55 to 59 years 27,845 26,986 54,831
60 to 64 years 27,313 27,641 54,954
65 to 69 years 20,043 22,249 42,292
70 to 74 years 13,491 15,160 28,651
75 to 79 years 8,034 9,838 17,872
80 to 84 years 4,761 5,370 10,131
85 years and over 4,007 8,297 12,304
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Things to know

What is the population of Snohomish County, WA under 18?

Snohomish County's population under the age of 18 is 185,672, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.64% of the total resident population of Snohomish County, WA.

What is the aging population in Snohomish County, WA?

Snohomish County's population aged 65 years and above was 111,250. As per the U.S. Census Bureau's American Community Survey, this population is 13.57% of the entire population.

References

Datasets

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

Key observations

The largest age group in Snohomish County, WA was for the group of age 30-34 years with a population of 63,738 (7.77%), according to the 2021 American Community Survey. At the same time, the smallest age group in Snohomish County, WA was the 80-84 years with a population of 10,131 (1.24%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the Snohomish 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 Snohomish 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.

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

Snohomish County, WA 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 Snohomish County, WA population pyramid, which represents the Snohomish 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 Snohomish County, WA, is 28.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Snohomish County, WA, is 20.1.
  • Total dependency ratio for Snohomish County, WA is 48.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Snohomish County, WA is 5.0.

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

Explore related topics

Snohomish County, WA Demographics Snohomish County, WA Population

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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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Collection 5 Resources