Download
Share
Contents
Save
Collection 5 Resources

DeKalb County, IL Population by Age

The median age in DeKalb County, IL is 31.4, as per 2021 ACS 5-Year Estimates. Of the total population, 17.96% were under the age of 15, 30.03% aged 15 to 29, 39.37% aged 30 to 64, 11.16% aged 65 to 84, and 1.48% were 85 years of age and older.
Neilsberg Research Avatar
By Neilsberg Research
Updated Sep 17, 2023

DeKalb County, IL population age distribution

A complete breakdown of DeKalb 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 5,775 5.72%
5 to 9 years 5,628 5.58%
10 to 14 years 6,723 6.66%
15 to 19 years 8,856 8.78%
20 to 24 years 14,148 14.02%
25 to 29 years 7,300 7.23%
30 to 34 years 6,216 6.16%
35 to 39 years 6,021 5.97%
40 to 44 years 5,604 5.55%
45 to 49 years 5,271 5.22%
50 to 54 years 5,432 5.38%
55 to 59 years 6,116 6.06%
60 to 64 years 5,070 5.02%
65 to 69 years 4,409 4.37%
70 to 74 years 3,355 3.32%
75 to 79 years 2,320 2.3%
80 to 84 years 1,182 1.17%
85 years and over 1,496 1.48%
Exploring California's Diversity? Request Customized Data Now!

TABLE OF CONTENTS

DeKalb County, IL population by age group

Key stats
41,130
Population under 25 years
25,141
Population aged 25-44
21,889
Population aged 45-64
12,762
Population aged 65+

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

The graph shows DeKalb 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
DeKalb County, IL population by age group. The largest age group was 20-24 years with a poulation of 14,148 (14.02% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in DeKalb County, IL was for the group of age 20-24 years with a population of 14,148 (14.02%), according to the 2021 American Community Survey.

At the same time, the smallest age group in DeKalb County, IL was the 80-84 years with a population of 1,182 (1.17%).

DeKalb County, IL population by age cohort

To better understand the age distribution of DeKalb 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 DeKalb 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.
DeKalb 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 66,275 (65.67% 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 21,885 21.69%
18 to 64 years 66,275 65.67%
85 years and over 12,762 12.65%
Exploring California's Diversity? Request Customized Data Now!

Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • DeKalb County's population under 18 was 21.69%, compared to the 22.51% nationwide.
  • DeKalb County's working population (between 18 and 64) was 65.67%, compared to 61.45% nationwide.
  • DeKalb County's elderly or the senior population (over 65 age) was 12.65% as compared to 16.04% nationwide.

DeKalb County, IL population pyramid

Population pyramid for DeKalb 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 DeKalb County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for DeKalb County, IL, is 25.9.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for DeKalb County, IL, is 18.2.
  • Total dependency ratio for DeKalb County, IL is 44.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for DeKalb County, IL is 5.5.
The graph shows DeKalb 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.
DeKalb County, IL population pyramid i.e. DeKalb County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 2,919 2,856 5,775
5 to 9 years 2,998 2,630 5,628
10 to 14 years 3,226 3,497 6,723
15 to 19 years 4,474 4,382 8,856
20 to 24 years 7,072 7,076 14,148
25 to 29 years 3,621 3,679 7,300
30 to 34 years 3,220 2,996 6,216
35 to 39 years 3,147 2,874 6,021
40 to 44 years 2,682 2,922 5,604
45 to 49 years 2,666 2,605 5,271
50 to 54 years 2,738 2,694 5,432
55 to 59 years 2,949 3,167 6,116
60 to 64 years 2,572 2,498 5,070
65 to 69 years 2,074 2,335 4,409
70 to 74 years 1,652 1,703 3,355
75 to 79 years 1,117 1,203 2,320
80 to 84 years 433 749 1,182
85 years and over 507 989 1,496
Exploring California's Diversity? Request Customized Data Now!

Things to know

What is the population of DeKalb County, IL under 18?

DeKalb County's population under the age of 18 is 21,885, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.69% of the total resident population of DeKalb County, IL.

What is the aging population in DeKalb County, IL?

DeKalb County's population aged 65 years and above was 12,762. As per the U.S. Census Bureau's American Community Survey, this population is 12.65% of the entire population.

References

Datasets

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

Key observations

The largest age group in DeKalb County, IL was for the group of age 20-24 years with a population of 14,148 (14.02%), according to the 2021 American Community Survey. At the same time, the smallest age group in DeKalb County, IL was the 80-84 years with a population of 1,182 (1.17%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the DeKalb 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 DeKalb 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.

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

DeKalb 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 DeKalb County, IL population pyramid, which represents the DeKalb 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 DeKalb County, IL, is 25.9.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for DeKalb County, IL, is 18.2.
  • Total dependency ratio for DeKalb County, IL is 44.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for DeKalb County, IL is 5.5.

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

Explore related topics

DeKalb County, IL Demographics DeKalb County, IL Population

Explore more

About the author

Neilsberg Research Avatar
Neilsberg Research
Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.
Read more from Neilsberg Research ➔

Share

This article is for informational purposes only and is not intended to be legal or tax advice. We recommend that you consult with a qualified professional such as a lawyer or accountant before making a decision. Many of the products and services featured here are from our affiliate partners. We may receive commissions on purchases made from our chosen links. Read advertiser disclosure.
Collection 5 Resources