Mellette County, SD Population by Age

The median age in Mellette County, SD is 31.0, as per 2019-2023 ACS 5 -Year Estimates. Of the total population, 26.38% were under the age of 15, 20.50% aged 15 to 29, 37.93% aged 30 to 64, 14.64% aged 65 to 84, and 0.54% were 85 years of age and older.
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Updated Feb 22, 2025

Mellette County, SD population age distributions

A complete breakdown of Mellette 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 156 7.64%
5 to 9 years 177 8.66%
10 to 14 years 206 10.08%
15 to 19 years 148 7.24%
20 to 24 years 119 5.82%
25 to 29 years 152 7.44%
30 to 34 years 81 3.96%
35 to 39 years 164 8.03%
40 to 44 years 58 2.84%
45 to 49 years 162 7.93%
50 to 54 years 74 3.62%
55 to 59 years 134 6.56%
60 to 64 years 102 4.99%
65 to 69 years 113 5.53%
70 to 74 years 96 4.7%
75 to 79 years 41 2.01%
80 to 84 years 49 2.4%
85 years and over 11 0.54%
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Mellette County, SD population by age group

Key stats
806
Population under 25 years
455
Population aged 25-44
472
Population aged 45-64
310
Population aged 65+

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

FIGURE 1

Mellette County, SD population by age group.

The largest age group is 10 to 14 years with a population of 206 (10.08% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

The largest age group in Mellette County, SD was for the group of age 10 to 14 years with a population of 206 (10.08%), according to the 2019-2023 American Community Survey.

At the same time, the smallest age group in Mellette County, SD was the 85 years and over with a population of 11 (0.54%).

Mellette County, SD population by age cohort

To better understand the age distribution of Mellette County, SD'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

Mellette County, SD population by age cohort

The largest age group was 18 to 64 years with a population of 1,087 (53.21% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.

Mellette County, SD population by age cohort

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

Age Group Population % of Total Population
Under 18 years 646 31.62%
18 to 64 years 1,087 53.21%
65 years and over 310 15.17%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Mellette County 's population under 18 was 31.62%, compared to the 22.16% nationwide.
  • Mellette County's working population (between 18 and 64) was 53.21%, compared to 61% nationwide.
  • Mellette County's elderly or the senior population (over 65 age) was 15.17% as compared to 16.84% nationwide.

Mellette County, SD population pyramid

Population pyramid for Mellette County, SD 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 Mellette County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Mellette County, SD, is 45.1.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Mellette County, SD, is 26.0.
  • Total dependency ratio for Mellette County, SD is 71.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Mellette County, SD is 3.9.

FIGURE 3

Mellette County, SD population pyramid

Mellette 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.

Mellette County, SD population pyramid

Here's the Mellette County, SD's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 74 82 156
5 to 9 years 101 76 177
10 to 14 years 83 123 206
15 to 19 years 74 74 148
20 to 24 years 68 51 119
25 to 29 years 92 60 152
30 to 34 years 31 50 81
35 to 39 years 76 88 164
40 to 44 years 26 32 58
45 to 49 years 76 86 162
50 to 54 years 37 37 74
55 to 59 years 60 74 134
60 to 64 years 44 58 102
65 to 69 years 27 86 113
70 to 74 years 45 51 96
75 to 79 years 29 12 41
80 to 84 years 30 19 49
85 years and over 4 7 11
Exploring Mellette County's Diversity? Request Customized Data Now!

Things to know

What is the population of Mellette County, SD under 18?

Mellette County's population under the age of 18 is 646, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 31.62% of the total resident population of Mellette County, SD.

What is the aging population in Mellette County, SD?

Mellette County's population aged 65 years and above was 310. As per the U.S. Census Bureau's American Community Survey, this population is 15.17% of the entire population.

References

Datasets

Explore datasets by year of publication.
2025
Mellette County, SD Age Group Population Dataset: A Complete Breakdown of Mellette 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 Mellette 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 Mellette County. The dataset can be utilized to understand the population distribution of Mellette County by age. For example, using this dataset, we can identify the largest age group in Mellette County.

Key observations

The largest age group in Mellette County, SD was for the group of age 10 to 14 years years with a population of 206 (10.08%), according to the ACS 2019-2023 5-Year Estimates. At the same time, the smallest age group in Mellette County, SD was the 85 years and over years with a population of 11 (0.54%). 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 Mellette County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Mellette 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 Mellette County Population by Age. You can refer the same here

Mellette County, SD Age Cohorts Dataset: Children, Working Adults, and Seniors in Mellette 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 Mellette 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 Mellette 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 1,087 (53.21% 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 Mellette County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Mellette County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Mellette 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 Mellette County Population by Age. You can refer the same here

Mellette County, SD 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 Mellette County, SD population pyramid, which represents the Mellette 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 Mellette County, SD, is 45.1.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Mellette County, SD, is 26.0.
  • Total dependency ratio for Mellette County, SD is 71.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Mellette County, SD is 3.9.
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 Mellette County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Mellette County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Mellette County for the selected age group is shown in the following column.
  • Total Population: The total population of the Mellette 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 Mellette 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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