Ada County, ID Population by Age

The median age in Ada County, ID is 37.7, as per 2021 ACS 5-Year Estimates. Of the total population, 19.09% were under the age of 15, 19.71% aged 15 to 29, 46.54% aged 30 to 64, 13.30% aged 65 to 84, and 1.37% were 85 years of age and older.
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Updated Sep 17, 2023

Ada County, ID population age distribution

A complete breakdown of Ada 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 26,705 5.5%
5 to 9 years 29,030 5.98%
10 to 14 years 36,880 7.6%
15 to 19 years 33,255 6.85%
20 to 24 years 28,747 5.92%
25 to 29 years 33,625 6.93%
30 to 34 years 34,648 7.14%
35 to 39 years 37,403 7.71%
40 to 44 years 32,509 6.7%
45 to 49 years 32,147 6.62%
50 to 54 years 30,258 6.24%
55 to 59 years 31,646 6.52%
60 to 64 years 27,218 5.61%
65 to 69 years 25,478 5.25%
70 to 74 years 19,377 3.99%
75 to 79 years 12,177 2.51%
80 to 84 years 7,494 1.54%
85 years and over 6,649 1.37%
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Ada County, ID population by age group

Key stats
154,617
Population under 25 years
138,185
Population aged 25-44
121,269
Population aged 45-64
71,175
Population aged 65+

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

The graph shows Ada 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
Ada County, ID population by age group. The largest age group was 35-39 years with a poulation of 37,403 (7.71% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Ada County, ID was for the group of age 35-39 years with a population of 37,403 (7.71%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Ada County, ID was the 85+ years with a population of 6,649 (1.37%).

Ada County, ID population by age cohort

To better understand the age distribution of Ada County, ID'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 Ada 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.
Ada County, ID 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 300,600 (61.95% 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 113,471 23.38%
18 to 64 years 300,600 61.95%
85 years and over 71,175 14.67%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Ada County's population under 18 was 23.38%, compared to the 22.51% nationwide.
  • Ada County's working population (between 18 and 64) was 61.95%, compared to 61.45% nationwide.
  • Ada County's elderly or the senior population (over 65 age) was 14.67% as compared to 16.04% nationwide.

Ada County, ID population pyramid

Population pyramid for Ada County, ID 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 Ada County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Ada County, ID, is 28.8.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Ada County, ID, is 22.1.
  • Total dependency ratio for Ada County, ID is 51.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Ada County, ID is 4.5.
The graph shows Ada 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.
Ada County, ID population pyramid i.e. Ada County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Ada County, ID's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 13,637 13,068 26,705
5 to 9 years 14,840 14,190 29,030
10 to 14 years 18,853 18,027 36,880
15 to 19 years 17,120 16,135 33,255
20 to 24 years 14,919 13,828 28,747
25 to 29 years 17,427 16,198 33,625
30 to 34 years 17,487 17,161 34,648
35 to 39 years 18,813 18,590 37,403
40 to 44 years 16,934 15,575 32,509
45 to 49 years 16,744 15,403 32,147
50 to 54 years 15,482 14,776 30,258
55 to 59 years 15,881 15,765 31,646
60 to 64 years 13,042 14,176 27,218
65 to 69 years 12,180 13,298 25,478
70 to 74 years 9,288 10,089 19,377
75 to 79 years 5,605 6,572 12,177
80 to 84 years 3,473 4,021 7,494
85 years and over 2,377 4,272 6,649
Exploring Ada County's Diversity? Request Customized Data Now!

Things to know

What is the population of Ada County, ID under 18?

Ada County's population under the age of 18 is 113,471, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 23.38% of the total resident population of Ada County, ID.

What is the aging population in Ada County, ID?

Ada County's population aged 65 years and above was 71,175. As per the U.S. Census Bureau's American Community Survey, this population is 14.67% of the entire population.

References

Datasets

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

Key observations

The largest age group in Ada County, ID was for the group of age 35-39 years with a population of 37,403 (7.71%), according to the 2021 American Community Survey. At the same time, the smallest age group in Ada County, ID was the 85+ years with a population of 6,649 (1.37%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Ada County, ID Age Cohorts Dataset: Children, Working Adults, and Seniors in Ada 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 Ada 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 Ada 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.

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

Ada County, ID 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 Ada County, ID population pyramid, which represents the Ada 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 Ada County, ID, is 28.8.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Ada County, ID, is 22.1.
  • Total dependency ratio for Ada County, ID is 51.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Ada County, ID is 4.5.

Ada 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 Ada County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Ada County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Ada County for the selected age group is shown in the following column.
  • Total Population: The total population of the Ada 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 Ada 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 team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.

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