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Marion County, IN Population by Age

The median age in Marion County, IN is 34.4, as per 2021 ACS 5-Year Estimates. Of the total population, 20.96% were under the age of 15, 21.97% aged 15 to 29, 44.55% aged 30 to 64, 11.05% aged 65 to 84, and 1.48% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Marion County, IN population age distribution

A complete breakdown of Marion 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 69,080 7.13%
5 to 9 years 66,447 6.85%
10 to 14 years 67,671 6.98%
15 to 19 years 61,481 6.34%
20 to 24 years 66,850 6.9%
25 to 29 years 84,673 8.73%
30 to 34 years 77,136 7.96%
35 to 39 years 69,677 7.19%
40 to 44 years 57,204 5.9%
45 to 49 years 56,004 5.78%
50 to 54 years 56,136 5.79%
55 to 59 years 59,534 6.14%
60 to 64 years 56,213 5.8%
65 to 69 years 43,484 4.49%
70 to 74 years 31,319 3.23%
75 to 79 years 19,560 2.02%
80 to 84 years 12,767 1.32%
85 years and over 14,306 1.48%
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TABLE OF CONTENTS

Marion County, IN population by age group

Key stats
331,529
Population under 25 years
288,690
Population aged 25-44
227,887
Population aged 45-64
121,436
Population aged 65+

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

The graph shows Marion 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
Marion County, IN population by age group. The largest age group was 25-29 years with a poulation of 84,673 (8.73% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Marion County, IN was for the group of age 25-29 years with a population of 84,673 (8.73%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Marion County, IN was the 80-84 years with a population of 12,767 (1.32%).

Marion County, IN population by age cohort

To better understand the age distribution of Marion County, IN'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 Marion 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.
Marion County, IN 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 607,196 (62.63% 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 240,910 24.85%
18 to 64 years 607,196 62.63%
85 years and over 121,436 12.53%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Marion County's population under 18 was 24.85%, compared to the 22.51% nationwide.
  • Marion County's working population (between 18 and 64) was 62.63%, compared to 61.45% nationwide.
  • Marion County's elderly or the senior population (over 65 age) was 12.53% as compared to 16.04% nationwide.

Marion County, IN population pyramid

Population pyramid for Marion County, IN 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 Marion County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Marion County, IN, is 31.5.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Marion County, IN, is 18.8.
  • Total dependency ratio for Marion County, IN is 50.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Marion County, IN is 5.3.
The graph shows Marion 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.
Marion County, IN population pyramid i.e. Marion County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Marion County, IN's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 35,403 33,677 69,080
5 to 9 years 34,286 32,161 66,447
10 to 14 years 34,307 33,364 67,671
15 to 19 years 30,923 30,558 61,481
20 to 24 years 32,216 34,634 66,850
25 to 29 years 40,932 43,741 84,673
30 to 34 years 37,332 39,804 77,136
35 to 39 years 33,389 36,288 69,677
40 to 44 years 28,758 28,446 57,204
45 to 49 years 27,335 28,669 56,004
50 to 54 years 27,256 28,880 56,136
55 to 59 years 28,494 31,040 59,534
60 to 64 years 26,721 29,492 56,213
65 to 69 years 20,072 23,412 43,484
70 to 74 years 13,907 17,412 31,319
75 to 79 years 8,618 10,942 19,560
80 to 84 years 4,394 8,373 12,767
85 years and over 4,788 9,518 14,306
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Things to know

What is the population of Marion County, IN under 18?

Marion County's population under the age of 18 is 240,910, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 24.85% of the total resident population of Marion County, IN.

What is the aging population in Marion County, IN?

Marion County's population aged 65 years and above was 121,436. As per the U.S. Census Bureau's American Community Survey, this population is 12.53% of the entire population.

References

Datasets

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

Key observations

The largest age group in Marion County, IN was for the group of age 25-29 years with a population of 84,673 (8.73%), according to the 2021 American Community Survey. At the same time, the smallest age group in Marion County, IN was the 80-84 years with a population of 12,767 (1.32%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the Marion 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 Marion 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.

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

Marion County, IN 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 Marion County, IN population pyramid, which represents the Marion 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 Marion County, IN, is 31.5.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Marion County, IN, is 18.8.
  • Total dependency ratio for Marion County, IN is 50.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Marion County, IN is 5.3.

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

Explore related topics

Marion County, IN Demographics Marion County, IN 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