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Washtenaw County, MI Population by Age

The median age in Washtenaw County, MI is 34.1, as per 2021 ACS 5-Year Estimates. Of the total population, 15.29% were under the age of 15, 29.50% aged 15 to 29, 41.08% aged 30 to 64, 12.62% aged 65 to 84, and 1.51% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Washtenaw County, MI population age distribution

A complete breakdown of Washtenaw 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 17,887 4.8%
5 to 9 years 18,387 4.94%
10 to 14 years 20,666 5.55%
15 to 19 years 33,427 8.98%
20 to 24 years 47,330 12.71%
25 to 29 years 29,094 7.81%
30 to 34 years 23,847 6.4%
35 to 39 years 22,851 6.14%
40 to 44 years 20,569 5.52%
45 to 49 years 21,141 5.68%
50 to 54 years 21,820 5.86%
55 to 59 years 21,478 5.77%
60 to 64 years 21,303 5.72%
65 to 69 years 18,333 4.92%
70 to 74 years 14,204 3.81%
75 to 79 years 8,986 2.41%
80 to 84 years 5,474 1.47%
85 years and over 5,631 1.51%
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TABLE OF CONTENTS

Washtenaw County, MI population by age group

Key stats
137,697
Population under 25 years
96,361
Population aged 25-44
85,742
Population aged 45-64
52,628
Population aged 65+

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

The graph shows Washtenaw 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
Washtenaw County, MI population by age group. The largest age group was 20-24 years with a poulation of 47,330 (12.71% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Washtenaw County, MI was for the group of age 20-24 years with a population of 47,330 (12.71%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Washtenaw County, MI was the 80-84 years with a population of 5,474 (1.47%).

Washtenaw County, MI population by age cohort

To better understand the age distribution of Washtenaw County, MI'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 Washtenaw 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.
Washtenaw County, MI 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 250,186 (67.18% 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 69,614 18.69%
18 to 64 years 250,186 67.18%
85 years and over 52,628 14.13%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Washtenaw County's population under 18 was 18.69%, compared to the 22.51% nationwide.
  • Washtenaw County's working population (between 18 and 64) was 67.18%, compared to 61.45% nationwide.
  • Washtenaw County's elderly or the senior population (over 65 age) was 14.13% as compared to 16.04% nationwide.

Washtenaw County, MI population pyramid

Population pyramid for Washtenaw County, MI 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 Washtenaw County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Washtenaw County, MI, is 21.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Washtenaw County, MI, is 20.0.
  • Total dependency ratio for Washtenaw County, MI is 41.7.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Washtenaw County, MI is 5.0.
The graph shows Washtenaw 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.
Washtenaw County, MI population pyramid i.e. Washtenaw County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Washtenaw County, MI's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 9,065 8,822 17,887
5 to 9 years 9,892 8,495 18,387
10 to 14 years 10,214 10,452 20,666
15 to 19 years 16,718 16,709 33,427
20 to 24 years 23,998 23,332 47,330
25 to 29 years 15,164 13,930 29,094
30 to 34 years 12,365 11,482 23,847
35 to 39 years 11,332 11,519 22,851
40 to 44 years 10,643 9,926 20,569
45 to 49 years 10,506 10,635 21,141
50 to 54 years 10,798 11,022 21,820
55 to 59 years 10,501 10,977 21,478
60 to 64 years 10,312 10,991 21,303
65 to 69 years 8,554 9,779 18,333
70 to 74 years 6,776 7,428 14,204
75 to 79 years 3,870 5,116 8,986
80 to 84 years 2,474 3,000 5,474
85 years and over 2,136 3,495 5,631
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Things to know

What is the population of Washtenaw County, MI under 18?

Washtenaw County's population under the age of 18 is 69,614, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 18.69% of the total resident population of Washtenaw County, MI.

What is the aging population in Washtenaw County, MI?

Washtenaw County's population aged 65 years and above was 52,628. As per the U.S. Census Bureau's American Community Survey, this population is 14.13% of the entire population.

References

Datasets

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

Key observations

The largest age group in Washtenaw County, MI was for the group of age 20-24 years with a population of 47,330 (12.71%), according to the 2021 American Community Survey. At the same time, the smallest age group in Washtenaw County, MI was the 80-84 years with a population of 5,474 (1.47%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the Washtenaw 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 Washtenaw 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.

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

Washtenaw County, MI 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 Washtenaw County, MI population pyramid, which represents the Washtenaw 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 Washtenaw County, MI, is 21.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Washtenaw County, MI, is 20.0.
  • Total dependency ratio for Washtenaw County, MI is 41.7.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Washtenaw County, MI is 5.0.

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

Explore related topics

Washtenaw County, MI Demographics Washtenaw County, MI Population

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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