Arapahoe County, CO Population by Age

The median age in Arapahoe County, CO is 37.0, as per 2021 ACS 5-Year Estimates. Of the total population, 19.31% were under the age of 15, 19.86% aged 15 to 29, 47.61% aged 30 to 64, 11.71% aged 65 to 84, and 1.51% were 85 years of age and older.
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Updated Sep 17, 2023

Arapahoe County, CO population age distribution

A complete breakdown of Arapahoe 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 38,938 5.98%
5 to 9 years 41,935 6.44%
10 to 14 years 44,957 6.9%
15 to 19 years 41,029 6.3%
20 to 24 years 38,442 5.9%
25 to 29 years 49,944 7.66%
30 to 34 years 51,496 7.9%
35 to 39 years 48,301 7.41%
40 to 44 years 47,122 7.23%
45 to 49 years 43,861 6.73%
50 to 54 years 40,476 6.21%
55 to 59 years 39,903 6.12%
60 to 64 years 39,054 5.99%
65 to 69 years 30,874 4.74%
70 to 74 years 24,061 3.69%
75 to 79 years 12,898 1.98%
80 to 84 years 8,475 1.3%
85 years and over 9,855 1.51%
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Arapahoe County, CO population by age group

Key stats
205,301
Population under 25 years
196,863
Population aged 25-44
163,294
Population aged 45-64
86,163
Population aged 65+

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

The graph shows Arapahoe 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
Arapahoe County, CO population by age group. The largest age group was 30-34 years with a poulation of 51,496 (7.90% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Arapahoe County, CO was for the group of age 30-34 years with a population of 51,496 (7.90%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Arapahoe County, CO was the 80-84 years with a population of 8,475 (1.30%).

Arapahoe County, CO population by age cohort

To better understand the age distribution of Arapahoe County, CO'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 Arapahoe 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.
Arapahoe County, CO 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 412,713 (63.34% 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 152,745 23.44%
18 to 64 years 412,713 63.34%
85 years and over 86,163 13.22%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Arapahoe County's population under 18 was 23.44%, compared to the 22.51% nationwide.
  • Arapahoe County's working population (between 18 and 64) was 63.34%, compared to 61.45% nationwide.
  • Arapahoe County's elderly or the senior population (over 65 age) was 13.22% as compared to 16.04% nationwide.

Arapahoe County, CO population pyramid

Population pyramid for Arapahoe County, CO 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 Arapahoe County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Arapahoe County, CO, is 28.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Arapahoe County, CO, is 19.6.
  • Total dependency ratio for Arapahoe County, CO is 48.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Arapahoe County, CO is 5.1.
The graph shows Arapahoe 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.
Arapahoe County, CO population pyramid i.e. Arapahoe County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Arapahoe County, CO's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 19,814 19,124 38,938
5 to 9 years 21,014 20,921 41,935
10 to 14 years 23,740 21,217 44,957
15 to 19 years 21,263 19,766 41,029
20 to 24 years 19,541 18,901 38,442
25 to 29 years 25,585 24,359 49,944
30 to 34 years 26,377 25,119 51,496
35 to 39 years 24,875 23,426 48,301
40 to 44 years 23,627 23,495 47,122
45 to 49 years 22,056 21,805 43,861
50 to 54 years 20,220 20,256 40,476
55 to 59 years 19,406 20,497 39,903
60 to 64 years 18,984 20,070 39,054
65 to 69 years 14,751 16,123 30,874
70 to 74 years 10,826 13,235 24,061
75 to 79 years 5,608 7,290 12,898
80 to 84 years 3,616 4,859 8,475
85 years and over 3,647 6,208 9,855
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Things to know

What is the population of Arapahoe County, CO under 18?

Arapahoe County's population under the age of 18 is 152,745, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 23.44% of the total resident population of Arapahoe County, CO.

What is the aging population in Arapahoe County, CO?

Arapahoe County's population aged 65 years and above was 86,163. As per the U.S. Census Bureau's American Community Survey, this population is 13.22% of the entire population.

References

Datasets

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

Key observations

The largest age group in Arapahoe County, CO was for the group of age 30-34 years with a population of 51,496 (7.90%), according to the 2021 American Community Survey. At the same time, the smallest age group in Arapahoe County, CO was the 80-84 years with a population of 8,475 (1.30%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Arapahoe County, CO Age Cohorts Dataset: Children, Working Adults, and Seniors in Arapahoe 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 Arapahoe 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 Arapahoe 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.

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

Arapahoe County, CO 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 Arapahoe County, CO population pyramid, which represents the Arapahoe 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 Arapahoe County, CO, is 28.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Arapahoe County, CO, is 19.6.
  • Total dependency ratio for Arapahoe County, CO is 48.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Arapahoe County, CO is 5.1.

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