Clackamas County, OR Population by Age

The median age in Clackamas County, OR is 42.1, as per 2019-2023 ACS 5 -Year Estimates. Of the total population, 17.14% were under the age of 15, 16.94% aged 15 to 29, 46.60% aged 30 to 64, 17.12% aged 65 to 84, and 2.23% were 85 years of age and older.
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Updated Feb 22, 2025

Clackamas County, OR population age distributions

A complete breakdown of Clackamas 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 20,832 4.93%
5 to 9 years 25,790 6.11%
10 to 14 years 25,742 6.1%
15 to 19 years 25,285 5.99%
20 to 24 years 21,870 5.18%
25 to 29 years 24,362 5.77%
30 to 34 years 26,638 6.31%
35 to 39 years 28,644 6.78%
40 to 44 years 30,133 7.14%
45 to 49 years 27,599 6.54%
50 to 54 years 27,746 6.57%
55 to 59 years 27,146 6.43%
60 to 64 years 28,838 6.83%
65 to 69 years 27,016 6.4%
70 to 74 years 22,272 5.27%
75 to 79 years 14,478 3.43%
80 to 84 years 8,513 2.02%
85 years and over 9,404 2.23%
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Clackamas County, OR population by age group

Key stats
119,519
Population under 25 years
109,777
Population aged 25-44
111,329
Population aged 45-64
81,683
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2019-2023

FIGURE 1

Clackamas County, OR population by age group.

The largest age group is 40 to 44 years with a population of 30,133 (7.14% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

The largest age group in Clackamas County, OR was for the group of age 40 to 44 years with a population of 30,133 (7.14%), according to the 2019-2023 American Community Survey.

At the same time, the smallest age group in Clackamas County, OR was the 80 to 84 years with a population of 8,513 (2.02%).

Clackamas County, OR population by age cohort

To better understand the age distribution of Clackamas 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

FIGURE 2

Clackamas County, OR population by age cohort

The largest age group was 18 to 64 years with a population of 251,611 (59.58% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

Clackamas County, OR population by age cohort

Here's the population for each of the three cohorts.

Age Group Population % of Total Population
Under 18 years 89,014 21.08%
18 to 64 years 251,611 59.58%
65 years and over 81,683 19.34%
Exploring Clackamas County's Diversity? Request Customized Data Now!

Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Clackamas County 's population under 18 was 21.08%, compared to the 22.16% nationwide.
  • Clackamas County's working population (between 18 and 64) was 59.58%, compared to 61% nationwide.
  • Clackamas County's elderly or the senior population (over 65 age) was 19.34% as compared to 16.84% nationwide.

Clackamas County, OR population pyramid

Population pyramid for Clackamas 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 Clackamas County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Clackamas County, OR, is 27.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Clackamas County, OR, is 30.4.
  • Total dependency ratio for Clackamas County, OR is 57.4.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Clackamas County, OR is 3.3.

FIGURE 3

Clackamas County, OR population pyramid

Clackamas County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

Clackamas County, OR population pyramid

Here's the Clackamas County, OR's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 10,591 10,241 20,832
5 to 9 years 13,740 12,050 25,790
10 to 14 years 12,814 12,928 25,742
15 to 19 years 12,969 12,316 25,285
20 to 24 years 11,439 10,431 21,870
25 to 29 years 12,406 11,956 24,362
30 to 34 years 13,378 13,260 26,638
35 to 39 years 14,312 14,332 28,644
40 to 44 years 15,041 15,092 30,133
45 to 49 years 13,871 13,728 27,599
50 to 54 years 14,021 13,725 27,746
55 to 59 years 13,676 13,470 27,146
60 to 64 years 13,883 14,955 28,838
65 to 69 years 13,188 13,828 27,016
70 to 74 years 10,214 12,058 22,272
75 to 79 years 6,845 7,633 14,478
80 to 84 years 3,719 4,794 8,513
85 years and over 3,455 5,949 9,404
Exploring Clackamas County's Diversity? Request Customized Data Now!

Things to know

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

Clackamas County's population under the age of 18 is 89,014, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.08% of the total resident population of Clackamas County, OR.

What is the aging population in Clackamas County, OR?

Clackamas County's population aged 65 years and above was 81,683. As per the U.S. Census Bureau's American Community Survey, this population is 19.34% of the entire population.

References

Datasets

Explore datasets by year of publication.
2025
Clackamas County, OR Age Group Population Dataset: A Complete Breakdown of Clackamas County Age Demographics from 0 to 85 Years and Over, Distributed Across 18 Age Groups // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

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

Key observations

The largest age group in Clackamas County, OR was for the group of age 40 to 44 years years with a population of 30,133 (7.14%), according to the ACS 2019-2023 5-Year Estimates. At the same time, the smallest age group in Clackamas County, OR was the 80 to 84 years years with a population of 8,513 (2.02%). Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Clackamas County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Clackamas 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 Clackamas County Population by Age. You can refer the same here

Clackamas County, OR Age Cohorts Dataset: Children, Working Adults, and Seniors in Clackamas County - Population and Percentage Analysis // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

The dataset tabulates the Clackamas 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 Clackamas 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 18 to 64 years with a poulation of 251,611 (59.58% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Clackamas County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Clackamas County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Clackamas 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 Clackamas County Population by Age. You can refer the same here

Clackamas County, OR Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Clackamas County, OR population pyramid, which represents the Clackamas County population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Clackamas County, OR, is 27.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Clackamas County, OR, is 30.4.
  • Total dependency ratio for Clackamas County, OR is 57.4.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Clackamas County, OR is 3.3.
Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Clackamas County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Clackamas County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Clackamas County for the selected age group is shown in the following column.
  • Total Population: The total population of the Clackamas 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 Clackamas 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
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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