Washington County, OR Population by Age

The median age in Washington County, OR is 37.3, as per 2021 ACS 5-Year Estimates. Of the total population, 18.75% were under the age of 15, 19.62% aged 15 to 29, 48.20% aged 30 to 64, 11.91% aged 65 to 84, and 1.52% were 85 years of age and older.
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Updated Sep 17, 2023

Washington County, OR population age distribution

A complete breakdown of Washington 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 34,129 5.72%
5 to 9 years 36,632 6.14%
10 to 14 years 41,191 6.9%
15 to 19 years 36,629 6.14%
20 to 24 years 35,166 5.89%
25 to 29 years 45,312 7.59%
30 to 34 years 47,854 8.02%
35 to 39 years 46,763 7.83%
40 to 44 years 44,840 7.51%
45 to 49 years 41,617 6.97%
50 to 54 years 37,724 6.32%
55 to 59 years 34,763 5.82%
60 to 64 years 34,154 5.72%
65 to 69 years 28,667 4.8%
70 to 74 years 21,014 3.52%
75 to 79 years 13,412 2.25%
80 to 84 years 8,027 1.34%
85 years and over 9,075 1.52%
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Washington County, OR population by age group

Key stats
183,747
Population under 25 years
184,769
Population aged 25-44
148,258
Population aged 45-64
80,195
Population aged 65+

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

The graph shows Washington 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
Washington County, OR population by age group. The largest age group was 30-34 years with a poulation of 47,854 (8.02% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Washington County, OR was for the group of age 30-34 years with a population of 47,854 (8.02%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Washington County, OR was the 80-84 years with a population of 8,027 (1.34%).

Washington County, OR population by age cohort

To better understand the age distribution of Washington County, OR'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 Washington 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.
Washington County, OR 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 381,230 (63.86% 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 135,544 22.71%
18 to 64 years 381,230 63.86%
85 years and over 80,195 13.43%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Washington County's population under 18 was 22.71%, compared to the 22.51% nationwide.
  • Washington County's working population (between 18 and 64) was 63.86%, compared to 61.45% nationwide.
  • Washington County's elderly or the senior population (over 65 age) was 13.43% as compared to 16.04% nationwide.

Washington County, OR population pyramid

Population pyramid for Washington County, OR 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 Washington County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Washington County, OR, is 27.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Washington County, OR, is 19.8.
  • Total dependency ratio for Washington County, OR is 47.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Washington County, OR is 5.0.
The graph shows Washington 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.
Washington County, OR population pyramid i.e. Washington County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Washington County, OR's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 17,620 16,509 34,129
5 to 9 years 18,479 18,153 36,632
10 to 14 years 21,442 19,749 41,191
15 to 19 years 18,834 17,795 36,629
20 to 24 years 17,509 17,657 35,166
25 to 29 years 22,976 22,336 45,312
30 to 34 years 24,548 23,306 47,854
35 to 39 years 24,412 22,351 46,763
40 to 44 years 22,300 22,540 44,840
45 to 49 years 21,064 20,553 41,617
50 to 54 years 19,034 18,690 37,724
55 to 59 years 17,195 17,568 34,763
60 to 64 years 16,706 17,448 34,154
65 to 69 years 13,039 15,628 28,667
70 to 74 years 9,698 11,316 21,014
75 to 79 years 6,000 7,412 13,412
80 to 84 years 3,267 4,760 8,027
85 years and over 3,236 5,839 9,075
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Things to know

What is the population of Washington County, OR under 18?

Washington County's population under the age of 18 is 135,544, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.71% of the total resident population of Washington County, OR.

What is the aging population in Washington County, OR?

Washington County's population aged 65 years and above was 80,195. As per the U.S. Census Bureau's American Community Survey, this population is 13.43% of the entire population.

References

Datasets

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

Key observations

The largest age group in Washington County, OR was for the group of age 30-34 years with a population of 47,854 (8.02%), according to the 2021 American Community Survey. At the same time, the smallest age group in Washington County, OR was the 80-84 years with a population of 8,027 (1.34%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Washington County, OR Age Cohorts Dataset: Children, Working Adults, and Seniors in Washington 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 Washington 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 Washington 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.

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

Washington County, OR 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 Washington County, OR population pyramid, which represents the Washington 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 Washington County, OR, is 27.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Washington County, OR, is 19.8.
  • Total dependency ratio for Washington County, OR is 47.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Washington County, OR is 5.0.

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

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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