Lake County, IL Population by Age

The median age in Lake County, IL is 38.5, as per 2021 ACS 5-Year Estimates. Of the total population, 19.44% were under the age of 15, 20.46% aged 15 to 29, 45.70% aged 30 to 64, 12.62% aged 65 to 84, and 1.78% were 85 years of age and older.
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Updated Sep 17, 2023

Lake County, IL population age distribution

A complete breakdown of Lake 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 39,917 5.59%
5 to 9 years 47,777 6.69%
10 to 14 years 51,230 7.17%
15 to 19 years 55,947 7.83%
20 to 24 years 50,154 7.02%
25 to 29 years 40,052 5.61%
30 to 34 years 39,150 5.48%
35 to 39 years 45,996 6.44%
40 to 44 years 44,369 6.21%
45 to 49 years 48,293 6.76%
50 to 54 years 50,669 7.09%
55 to 59 years 51,936 7.27%
60 to 64 years 46,104 6.45%
65 to 69 years 35,181 4.92%
70 to 74 years 27,523 3.85%
75 to 79 years 16,769 2.35%
80 to 84 years 10,676 1.49%
85 years and over 12,741 1.78%
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Lake County, IL population by age group

Key stats
245,025
Population under 25 years
169,567
Population aged 25-44
197,002
Population aged 45-64
102,890
Population aged 65+

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

The graph shows Lake 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
Lake County, IL population by age group. The largest age group was 15-19 years with a poulation of 55,947 (7.83% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Lake County, IL was for the group of age 15-19 years with a population of 55,947 (7.83%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Lake County, IL was the 80-84 years with a population of 10,676 (1.49%).

Lake County, IL population by age cohort

To better understand the age distribution of Lake 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 Lake 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.
Lake 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 439,167 (61.47% 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 172,427 24.13%
18 to 64 years 439,167 61.47%
85 years and over 102,890 14.4%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Lake County's population under 18 was 24.13%, compared to the 22.51% nationwide.
  • Lake County's working population (between 18 and 64) was 61.47%, compared to 61.45% nationwide.
  • Lake County's elderly or the senior population (over 65 age) was 14.40% as compared to 16.04% nationwide.

Lake County, IL population pyramid

Population pyramid for Lake 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 Lake County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Lake County, IL, is 29.4.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Lake County, IL, is 21.8.
  • Total dependency ratio for Lake County, IL is 51.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Lake County, IL is 4.6.
The graph shows Lake 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.
Lake County, IL population pyramid i.e. Lake County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 20,298 19,619 39,917
5 to 9 years 24,712 23,065 47,777
10 to 14 years 25,810 25,420 51,230
15 to 19 years 29,733 26,214 55,947
20 to 24 years 27,222 22,932 50,154
25 to 29 years 21,046 19,006 40,052
30 to 34 years 19,818 19,332 39,150
35 to 39 years 23,503 22,493 45,996
40 to 44 years 21,778 22,591 44,369
45 to 49 years 24,050 24,243 48,293
50 to 54 years 25,212 25,457 50,669
55 to 59 years 26,507 25,429 51,936
60 to 64 years 22,117 23,987 46,104
65 to 69 years 17,265 17,916 35,181
70 to 74 years 12,965 14,558 27,523
75 to 79 years 7,503 9,266 16,769
80 to 84 years 4,671 6,005 10,676
85 years and over 4,701 8,040 12,741
Exploring Lake County's Diversity? Request Customized Data Now!

Things to know

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

Lake County's population under the age of 18 is 172,427, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 24.13% of the total resident population of Lake County, IL.

What is the aging population in Lake County, IL?

Lake County's population aged 65 years and above was 102,890. As per the U.S. Census Bureau's American Community Survey, this population is 14.40% of the entire population.

References

Datasets

Explore datasets by year of publication.
2023
Lake County, IL Age Group Population Dataset: A complete breakdown of Lake County age demographics from 0 to 85 years, distributed across 18 age groups
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

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

Key observations

The largest age group in Lake County, IL was for the group of age 15-19 years with a population of 55,947 (7.83%), according to the 2021 American Community Survey. At the same time, the smallest age group in Lake County, IL was the 80-84 years with a population of 10,676 (1.49%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Lake County, IL Age Cohorts Dataset: Children, Working Adults, and Seniors in Lake County - Population and Percentage Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the Lake 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 Lake 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.

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

Lake County, IL Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Lake County, IL population pyramid, which represents the Lake 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 Lake County, IL, is 29.4.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Lake County, IL, is 21.8.
  • Total dependency ratio for Lake County, IL is 51.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Lake County, IL is 4.6.

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