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Montana Population by Age

The median age in Montana is 40.0, as per 2021 ACS 5-Year Estimates. Of the total population, 17.89% were under the age of 15, 19.38% aged 15 to 29, 43.95% aged 30 to 64, 16.89% aged 65 to 84, and 1.89% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Montana population age distribution

A complete breakdown of Montana'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 60,366 5.6%
5 to 9 years 64,963 6.03%
10 to 14 years 67,508 6.26%
15 to 19 years 66,874 6.2%
20 to 24 years 71,805 6.66%
25 to 29 years 70,213 6.51%
30 to 34 years 67,878 6.3%
35 to 39 years 69,474 6.44%
40 to 44 years 63,367 5.88%
45 to 49 years 59,619 5.53%
50 to 54 years 61,903 5.74%
55 to 59 years 72,740 6.75%
60 to 64 years 78,814 7.31%
65 to 69 years 71,261 6.61%
70 to 74 years 54,207 5.03%
75 to 79 years 35,565 3.3%
80 to 84 years 21,039 1.95%
85 years and over 20,382 1.89%
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TABLE OF CONTENTS

Montana population by age group

Key stats
331,516
Population under 25 years
270,932
Population aged 25-44
273,076
Population aged 45-64
202,454
Population aged 65+

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

The graph shows Montana'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
Montana population by age group. The largest age group was 60-64 years with a poulation of 78,814 (7.31% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Montana was for the group of age 60-64 years with a population of 78,814 (7.31%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Montana was the 85+ years with a population of 20,382 (1.89%).

Montana population by age cohort

To better understand the age distribution of Montana'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 Montana'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.
Montana 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 642,709 (59.62% 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 232,815 21.6%
18 to 64 years 642,709 59.62%
85 years and over 202,454 18.78%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Montana's population under 18 was 21.60%, compared to the 22.51% nationwide.
  • Montana's working population (between 18 and 64) was 59.62%, compared to 61.45% nationwide.
  • Montana's elderly or the senior population (over 65 age) was 18.78% as compared to 16.04% nationwide.

Montana population pyramid

Population pyramid for Montana 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 Montana's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Montana, is 28.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Montana, is 29.7.
  • Total dependency ratio for Montana is 57.9.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Montana is 3.4.
The graph shows Montana'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.
Montana population pyramid i.e. Montana population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Montana's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 31,226 29,140 60,366
5 to 9 years 33,436 31,527 64,963
10 to 14 years 34,933 32,575 67,508
15 to 19 years 35,082 31,792 66,874
20 to 24 years 37,780 34,025 71,805
25 to 29 years 35,936 34,277 70,213
30 to 34 years 34,407 33,471 67,878
35 to 39 years 35,629 33,845 69,474
40 to 44 years 32,629 30,738 63,367
45 to 49 years 30,583 29,036 59,619
50 to 54 years 31,423 30,480 61,903
55 to 59 years 35,729 37,011 72,740
60 to 64 years 38,977 39,837 78,814
65 to 69 years 34,901 36,360 71,261
70 to 74 years 27,907 26,300 54,207
75 to 79 years 17,524 18,041 35,565
80 to 84 years 9,898 11,141 21,039
85 years and over 7,671 12,711 20,382
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Things to know

What is the population of Montana under 18?

Montana's population under the age of 18 is 232,815, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.60% of the total resident population of Montana.

What is the aging population in Montana?

Montana's population aged 65 years and above was 202,454. As per the U.S. Census Bureau's American Community Survey, this population is 18.78% of the entire population.

References

Datasets

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

Key observations

The largest age group in Montana was for the group of age 60-64 years with a population of 78,814 (7.31%), according to the 2021 American Community Survey. At the same time, the smallest age group in Montana was the 85+ years with a population of 20,382 (1.89%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the Montana 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 Montana. 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.

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

Montana 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 Montana population pyramid, which represents the Montana 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 Montana, is 28.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Montana, is 29.7.
  • Total dependency ratio for Montana is 57.9.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Montana is 3.4.

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

Explore related topics

Montana Demographics Montana Population

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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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Collection 5 Resources