Multnomah County, OR Population by Age

The median age in Multnomah County, OR is 38.5, as per 2019-2023 ACS 5 -Year Estimates. Of the total population, 14.85% were under the age of 15, 19.29% aged 15 to 29, 51.45% aged 30 to 64, 12.89% aged 65 to 84, and 1.49% were 85 years of age and older.
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Updated Feb 22, 2025

Multnomah County, OR population age distributions

A complete breakdown of Multnomah 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 37,913 4.72%
5 to 9 years 38,678 4.81%
10 to 14 years 42,804 5.32%
15 to 19 years 40,711 5.06%
20 to 24 years 46,229 5.75%
25 to 29 years 68,194 8.48%
30 to 34 years 77,746 9.67%
35 to 39 years 69,797 8.68%
40 to 44 years 67,598 8.41%
45 to 49 years 56,992 7.09%
50 to 54 years 52,351 6.51%
55 to 59 years 44,654 5.55%
60 to 64 years 44,535 5.54%
65 to 69 years 39,956 4.97%
70 to 74 years 33,233 4.13%
75 to 79 years 19,714 2.45%
80 to 84 years 10,777 1.34%
85 years and over 11,981 1.49%
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Multnomah County, OR population by age group

Key stats
206,335
Population under 25 years
283,335
Population aged 25-44
198,532
Population aged 45-64
115,661
Population aged 65+

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

FIGURE 1

Multnomah County, OR population by age group.

The largest age group is 30 to 34 years with a population of 77,746 (9.67% of the total population).

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

The largest age group in Multnomah County, OR was for the group of age 30 to 34 years with a population of 77,746 (9.67%), according to the 2019-2023 American Community Survey.

At the same time, the smallest age group in Multnomah County, OR was the 80 to 84 years with a population of 10,777 (1.34%).

Multnomah County, OR population by age cohort

To better understand the age distribution of Multnomah 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

Multnomah County, OR population by age cohort

The largest age group was 18 to 64 years with a population of 544,113 (67.69% of the total population).

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

Multnomah 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 144,089 17.92%
18 to 64 years 544,113 67.69%
65 years and over 115,661 14.39%
Exploring Multnomah 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:

  • Multnomah County 's population under 18 was 17.92%, compared to the 22.16% nationwide.
  • Multnomah County's working population (between 18 and 64) was 67.69%, compared to 61% nationwide.
  • Multnomah County's elderly or the senior population (over 65 age) was 14.39% as compared to 16.84% nationwide.

Multnomah County, OR population pyramid

Population pyramid for Multnomah 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 Multnomah County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Multnomah County, OR, is 21.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Multnomah County, OR, is 20.3.
  • Total dependency ratio for Multnomah County, OR is 41.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Multnomah County, OR is 4.9.

FIGURE 3

Multnomah County, OR population pyramid

Multnomah 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.

Multnomah County, OR population pyramid

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 19,588 18,325 37,913
5 to 9 years 19,982 18,696 38,678
10 to 14 years 21,681 21,123 42,804
15 to 19 years 20,700 20,011 40,711
20 to 24 years 22,634 23,595 46,229
25 to 29 years 33,140 35,054 68,194
30 to 34 years 38,991 38,755 77,746
35 to 39 years 35,320 34,477 69,797
40 to 44 years 34,586 33,012 67,598
45 to 49 years 29,516 27,476 56,992
50 to 54 years 27,107 25,244 52,351
55 to 59 years 23,522 21,132 44,654
60 to 64 years 21,398 23,137 44,535
65 to 69 years 18,524 21,432 39,956
70 to 74 years 16,031 17,202 33,233
75 to 79 years 8,632 11,082 19,714
80 to 84 years 4,336 6,441 10,777
85 years and over 4,551 7,430 11,981
Exploring Multnomah County's Diversity? Request Customized Data Now!

Things to know

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

Multnomah County's population under the age of 18 is 144,089, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 17.92% of the total resident population of Multnomah County, OR.

What is the aging population in Multnomah County, OR?

Multnomah County's population aged 65 years and above was 115,661. As per the U.S. Census Bureau's American Community Survey, this population is 14.39% of the entire population.

References

Datasets

Explore datasets by year of publication.
2025
Multnomah County, OR Age Group Population Dataset: A Complete Breakdown of Multnomah 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 Multnomah 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 Multnomah County. The dataset can be utilized to understand the population distribution of Multnomah County by age. For example, using this dataset, we can identify the largest age group in Multnomah County.

Key observations

The largest age group in Multnomah County, OR was for the group of age 30 to 34 years years with a population of 77,746 (9.67%), according to the ACS 2019-2023 5-Year Estimates. At the same time, the smallest age group in Multnomah County, OR was the 80 to 84 years years with a population of 10,777 (1.34%). 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 Multnomah County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Multnomah 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 Multnomah County Population by Age. You can refer the same here

Multnomah County, OR Age Cohorts Dataset: Children, Working Adults, and Seniors in Multnomah 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 Multnomah 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 Multnomah 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 544,113 (67.69% 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 Multnomah County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Multnomah County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Multnomah 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 Multnomah County Population by Age. You can refer the same here

Multnomah 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 Multnomah County, OR population pyramid, which represents the Multnomah 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 Multnomah County, OR, is 21.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Multnomah County, OR, is 20.3.
  • Total dependency ratio for Multnomah County, OR is 41.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Multnomah County, OR is 4.9.
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 Multnomah County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Multnomah County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Multnomah County for the selected age group is shown in the following column.
  • Total Population: The total population of the Multnomah 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 Multnomah 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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