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Fergus County, MT Population by Age

The median age in Fergus County, MT is 45.3, as per 2019-2023 ACS 5 -Year Estimates. Of the total population, 17.01% were under the age of 15, 15.97% aged 15 to 29, 42.34% aged 30 to 64, 22.54% aged 65 to 84, and 2.12% were 85 years of age and older.
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By Neilsberg Research
Updated Feb 22, 2025

Fergus County, MT population age distributions

A complete breakdown of Fergus 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 614 5.3%
5 to 9 years 652 5.63%
10 to 14 years 704 6.08%
15 to 19 years 566 4.89%
20 to 24 years 562 4.85%
25 to 29 years 722 6.23%
30 to 34 years 663 5.72%
35 to 39 years 725 6.26%
40 to 44 years 564 4.87%
45 to 49 years 595 5.14%
50 to 54 years 600 5.18%
55 to 59 years 603 5.21%
60 to 64 years 1,154 9.96%
65 to 69 years 788 6.8%
70 to 74 years 895 7.73%
75 to 79 years 554 4.78%
80 to 84 years 374 3.23%
85 years and over 246 2.12%
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Fergus County, MT population by age group

Key stats
3,098
Population under 25 years
2,674
Population aged 25-44
2,952
Population aged 45-64
2,857
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2019-2023

FIGURE 1

Fergus County, MT population by age group.

The largest age group is 60 to 64 years with a population of 1,154 (9.96% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.
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The largest age group in Fergus County, MT was for the group of age 60 to 64 years with a population of 1,154 (9.96%), according to the 2019-2023 American Community Survey.

At the same time, the smallest age group in Fergus County, MT was the 85 years and over with a population of 246 (2.12%).

Fergus County, MT population by age cohort

To better understand the age distribution of Fergus County, MT'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

Fergus County, MT population by age cohort

The largest age group was 18 to 64 years with a population of 6,321 (54.58% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.
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Fergus County, MT population by age cohort

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

Age Group Population % of Total Population
Under 18 years 2,403 20.75%
18 to 64 years 6,321 54.58%
65 years and over 2,857 24.67%
Exploring Fergus 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:

  • Fergus County 's population under 18 was 20.75%, compared to the 22.16% nationwide.
  • Fergus County's working population (between 18 and 64) was 54.58%, compared to 61% nationwide.
  • Fergus County's elderly or the senior population (over 65 age) was 24.67% as compared to 16.84% nationwide.

Fergus County, MT population pyramid

Population pyramid for Fergus County, MT 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 Fergus County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Fergus County, MT, is 29.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Fergus County, MT, is 42.3.
  • Total dependency ratio for Fergus County, MT is 71.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Fergus County, MT is 2.4.

FIGURE 3

Fergus County, MT population pyramid

Fergus 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) 2019-2023 5-Year Estimates.
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Fergus County, MT population pyramid

Here's the Fergus County, MT's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 300 314 614
5 to 9 years 335 317 652
10 to 14 years 369 335 704
15 to 19 years 355 211 566
20 to 24 years 232 330 562
25 to 29 years 373 349 722
30 to 34 years 373 290 663
35 to 39 years 382 343 725
40 to 44 years 268 296 564
45 to 49 years 300 295 595
50 to 54 years 306 294 600
55 to 59 years 269 334 603
60 to 64 years 643 511 1,154
65 to 69 years 350 438 788
70 to 74 years 502 393 895
75 to 79 years 277 277 554
80 to 84 years 181 193 374
85 years and over 119 127 246
Exploring Fergus County's Diversity? Request Customized Data Now!

Things to know

What is the population of Fergus County, MT under 18?

Fergus County's population under the age of 18 is 2,403, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 20.75% of the total resident population of Fergus County, MT.

What is the aging population in Fergus County, MT?

Fergus County's population aged 65 years and above was 2,857. As per the U.S. Census Bureau's American Community Survey, this population is 24.67% of the entire population.

References

Datasets

Explore datasets by year of publication.
2025
Fergus County, MT Age Group Population Dataset: A Complete Breakdown of Fergus County Age Demographics from 0 to 85 Years and Over, Distributed Across 18 Age Groups // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

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

Key observations

The largest age group in Fergus County, MT was for the group of age 60 to 64 years years with a population of 1,154 (9.96%), according to the ACS 2019-2023 5-Year Estimates. At the same time, the smallest age group in Fergus County, MT was the 85 years and over years with a population of 246 (2.12%). Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Fergus County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Fergus 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 Fergus County Population by Age. You can refer the same here

Fergus County, MT Age Cohorts Dataset: Children, Working Adults, and Seniors in Fergus County - Population and Percentage Analysis // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

The dataset tabulates the Fergus 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 Fergus 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 6,321 (54.58% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Fergus County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Fergus County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Fergus 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 Fergus County Population by Age. You can refer the same here

Fergus County, MT Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis // 2025 Edition
Last updated February 22, 2025
ACS
Free
Neilsberg
CSV, JSON
2019-2023
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Fergus County, MT population pyramid, which represents the Fergus County population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Fergus County, MT, is 29.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Fergus County, MT, is 42.3.
  • Total dependency ratio for Fergus County, MT is 71.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Fergus County, MT is 2.4.
Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2019-2023 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 Fergus County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Fergus County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Fergus County for the selected age group is shown in the following column.
  • Total Population: The total population of the Fergus 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 Fergus 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.

Explore related topics

Fergus County, MT Demographics Fergus County, MT Population

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Neilsberg Research
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Collection 5 Resources