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Collection 5 Resources

Rock Island County, IL Population by Age

The median age in Rock Island County, IL is 40.1, as per 2021 ACS 5-Year Estimates. Of the total population, 18.72% were under the age of 15, 18.59% aged 15 to 29, 43.40% aged 30 to 64, 16.84% aged 65 to 84, and 2.45% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Rock Island County, IL population age distribution

A complete breakdown of Rock Island 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 8,720 6.03%
5 to 9 years 8,881 6.14%
10 to 14 years 9,488 6.56%
15 to 19 years 9,391 6.49%
20 to 24 years 8,744 6.04%
25 to 29 years 8,769 6.06%
30 to 34 years 8,727 6.03%
35 to 39 years 9,387 6.49%
40 to 44 years 8,149 5.63%
45 to 49 years 8,325 5.75%
50 to 54 years 8,526 5.89%
55 to 59 years 9,579 6.62%
60 to 64 years 10,106 6.98%
65 to 69 years 9,039 6.25%
70 to 74 years 7,088 4.9%
75 to 79 years 4,755 3.29%
80 to 84 years 3,480 2.41%
85 years and over 3,540 2.45%
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TABLE OF CONTENTS

Rock Island County, IL population by age group

Key stats
45,224
Population under 25 years
35,032
Population aged 25-44
36,536
Population aged 45-64
27,902
Population aged 65+

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

The graph shows Rock Island 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
Rock Island County, IL population by age group. The largest age group was 60-64 years with a poulation of 10,106 (6.98% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Rock Island County, IL was for the group of age 60-64 years with a population of 10,106 (6.98%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Rock Island County, IL was the 80-84 years with a population of 3,480 (2.41%).

Rock Island County, IL population by age cohort

To better understand the age distribution of Rock Island County, IL'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 Rock Island 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.
Rock Island County, IL 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 84,235 (58.22% 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 32,557 22.5%
18 to 64 years 84,235 58.22%
85 years and over 27,902 19.28%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Rock Island County's population under 18 was 22.50%, compared to the 22.51% nationwide.
  • Rock Island County's working population (between 18 and 64) was 58.22%, compared to 61.45% nationwide.
  • Rock Island County's elderly or the senior population (over 65 age) was 19.28% as compared to 16.04% nationwide.

Rock Island County, IL population pyramid

Population pyramid for Rock Island County, IL 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 Rock Island County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Rock Island County, IL, is 30.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Rock Island County, IL, is 31.1.
  • Total dependency ratio for Rock Island County, IL is 61.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Rock Island County, IL is 3.2.
The graph shows Rock Island 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.
Rock Island County, IL population pyramid i.e. Rock Island County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Rock Island County, IL's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 4,495 4,225 8,720
5 to 9 years 4,533 4,348 8,881
10 to 14 years 4,849 4,639 9,488
15 to 19 years 4,833 4,558 9,391
20 to 24 years 4,433 4,311 8,744
25 to 29 years 4,373 4,396 8,769
30 to 34 years 4,493 4,234 8,727
35 to 39 years 4,892 4,495 9,387
40 to 44 years 4,129 4,020 8,149
45 to 49 years 4,299 4,026 8,325
50 to 54 years 4,286 4,240 8,526
55 to 59 years 4,621 4,958 9,579
60 to 64 years 5,062 5,044 10,106
65 to 69 years 4,150 4,889 9,039
70 to 74 years 3,397 3,691 7,088
75 to 79 years 2,054 2,701 4,755
80 to 84 years 1,587 1,893 3,480
85 years and over 1,228 2,312 3,540
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Things to know

What is the population of Rock Island County, IL under 18?

Rock Island County's population under the age of 18 is 32,557, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.50% of the total resident population of Rock Island County, IL.

What is the aging population in Rock Island County, IL?

Rock Island County's population aged 65 years and above was 27,902. As per the U.S. Census Bureau's American Community Survey, this population is 19.28% of the entire population.

References

Datasets

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

Key observations

The largest age group in Rock Island County, IL was for the group of age 60-64 years with a population of 10,106 (6.98%), according to the 2021 American Community Survey. At the same time, the smallest age group in Rock Island County, IL was the 80-84 years with a population of 3,480 (2.41%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the Rock Island 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 Rock Island 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.

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

Rock Island County, IL 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 Rock Island County, IL population pyramid, which represents the Rock Island 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 Rock Island County, IL, is 30.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Rock Island County, IL, is 31.1.
  • Total dependency ratio for Rock Island County, IL is 61.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Rock Island County, IL is 3.2.

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

Explore related topics

Rock Island County, IL Demographics Rock Island County, IL Population

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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