Boulder County, CO Population by Age

The median age in Boulder County, CO is 37.0, as per 2018-2022 ACS 5 -Year Estimates. Of the total population, 14.54% were under the age of 15, 26.28% aged 15 to 29, 43.89% aged 30 to 64, 13.47% aged 65 to 84, and 1.81% were 85 years of age and older.
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Updated Jul 26, 2024

Boulder County, CO population age distributions

A complete breakdown of Boulder 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 13,358 4.06%
5 to 9 years 16,191 4.93%
10 to 14 years 18,237 5.55%
15 to 19 years 28,598 8.7%
20 to 24 years 34,453 10.48%
25 to 29 years 23,349 7.1%
30 to 34 years 21,529 6.55%
35 to 39 years 20,632 6.28%
40 to 44 years 20,516 6.24%
45 to 49 years 20,791 6.33%
50 to 54 years 20,584 6.26%
55 to 59 years 20,966 6.38%
60 to 64 years 19,215 5.85%
65 to 69 years 17,319 5.27%
70 to 74 years 13,828 4.21%
75 to 79 years 8,186 2.49%
80 to 84 years 4,945 1.5%
85 years and over 5,961 1.81%
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Boulder County, CO population by age group

Key stats
110,837
Population under 25 years
86,026
Population aged 25-44
81,556
Population aged 45-64
50,239
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022

FIGURE 1

Boulder County, CO population by age group.

The largest age group is 20 to 24 years with a population of 34,453 (10.48% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.

The largest age group in Boulder County, CO was for the group of age 20 to 24 years with a population of 34,453 (10.48%), according to the 2018-2022 American Community Survey.

At the same time, the smallest age group in Boulder County, CO was the 80 to 84 years with a population of 4,945 (1.50%).

Boulder County, CO population by age cohort

To better understand the age distribution of Boulder 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

FIGURE 2

Boulder County, CO population by age cohort

The largest age group was 18 to 64 years with a population of 218,854 (66.59% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.

Boulder County, CO population by age cohort

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

Age Group Population % of Total Population
Under 18 years 59,565 18.12%
18 to 64 years 218,854 66.59%
65 years and over 50,239 15.29%
Exploring Boulder 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:

  • Boulder County 's population under 18 was 18.12%, compared to the 22.11% nationwide.
  • Boulder County's working population (between 18 and 64) was 66.59%, compared to 61.36% nationwide.
  • Boulder County's elderly or the senior population (over 65 age) was 15.29% as compared to 16.53% nationwide.

Boulder County, CO population pyramid

Population pyramid for Boulder 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 Boulder County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Boulder County, CO, is 20.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Boulder County, CO, is 21.8.
  • Total dependency ratio for Boulder County, CO is 42.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Boulder County, CO is 4.6.

FIGURE 3

Boulder County, CO population pyramid

Boulder 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) 2018-2022 5-Year Estimates.

Boulder County, CO population pyramid

Here's the Boulder County, CO's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 6,713 6,645 13,358
5 to 9 years 8,552 7,639 16,191
10 to 14 years 9,074 9,163 18,237
15 to 19 years 14,339 14,259 28,598
20 to 24 years 18,220 16,233 34,453
25 to 29 years 12,763 10,586 23,349
30 to 34 years 11,620 9,909 21,529
35 to 39 years 10,941 9,691 20,632
40 to 44 years 10,177 10,339 20,516
45 to 49 years 10,563 10,228 20,791
50 to 54 years 10,481 10,103 20,584
55 to 59 years 10,302 10,664 20,966
60 to 64 years 9,576 9,639 19,215
65 to 69 years 8,800 8,519 17,319
70 to 74 years 6,219 7,609 13,828
75 to 79 years 3,763 4,423 8,186
80 to 84 years 1,988 2,957 4,945
85 years and over 2,224 3,737 5,961
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Things to know

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

Boulder County's population under the age of 18 is 59,565, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 18.12% of the total resident population of Boulder County, CO.

What is the aging population in Boulder County, CO?

Boulder County's population aged 65 years and above was 50,239. As per the U.S. Census Bureau's American Community Survey, this population is 15.29% of the entire population.

References

Datasets

Explore datasets by year of publication.
2024
Boulder County, CO Age Group Population Dataset: A Complete Breakdown of Boulder County Age Demographics from 0 to 85 Years and Over, Distributed Across 18 Age Groups // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

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

Key observations

The largest age group in Boulder County, CO was for the group of age 20 to 24 years years with a population of 34,453 (10.48%), according to the ACS 2018-2022 5-Year Estimates. At the same time, the smallest age group in Boulder County, CO was the 80 to 84 years years with a population of 4,945 (1.50%). Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Boulder County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Boulder 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 Boulder County Population by Age. You can refer the same here

Boulder County, CO Age Cohorts Dataset: Children, Working Adults, and Seniors in Boulder County - Population and Percentage Analysis // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the Boulder 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 Boulder 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 218,854 (66.59% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Boulder County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Boulder County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Boulder 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 Boulder County Population by Age. You can refer the same here

Boulder County, CO Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Boulder County, CO population pyramid, which represents the Boulder County population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Boulder County, CO, is 20.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Boulder County, CO, is 21.8.
  • Total dependency ratio for Boulder County, CO is 42.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Boulder County, CO is 4.6.
Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Boulder County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Boulder County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Boulder County for the selected age group is shown in the following column.
  • Total Population: The total population of the Boulder 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 Boulder 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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