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Collection 5 Resources

Los Angeles County, CA Population by Age

The median age in Los Angeles County, CA is 37.0, as per 2021 ACS 5-Year Estimates. Of the total population, 17.90% were under the age of 15, 21.14% aged 15 to 29, 47.27% aged 30 to 64, 11.83% aged 65 to 84, and 1.86% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Los Angeles County, CA population age distribution

A complete breakdown of Los Angeles 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 570,367 5.69%
5 to 9 years 579,682 5.79%
10 to 14 years 643,054 6.42%
15 to 19 years 631,736 6.3%
20 to 24 years 672,735 6.71%
25 to 29 years 814,015 8.12%
30 to 34 years 791,922 7.9%
35 to 39 years 719,258 7.18%
40 to 44 years 670,271 6.69%
45 to 49 years 673,831 6.73%
50 to 54 years 663,284 6.62%
55 to 59 years 638,231 6.37%
60 to 64 years 579,032 5.78%
65 to 69 years 460,887 4.6%
70 to 74 years 342,987 3.42%
75 to 79 years 222,406 2.22%
80 to 84 years 159,374 1.59%
85 years and over 186,563 1.86%
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TABLE OF CONTENTS

Los Angeles County, CA population by age group

Key stats
3,097,574
Population under 25 years
2,995,466
Population aged 25-44
2,554,378
Population aged 45-64
1,372,217
Population aged 65+

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

The graph shows Los Angeles 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
Los Angeles County, CA population by age group. The largest age group was 25-29 years with a poulation of 814,015 (8.12% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Los Angeles County, CA was for the group of age 25-29 years with a population of 814,015 (8.12%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Los Angeles County, CA was the 80-84 years with a population of 159,374 (1.59%).

Los Angeles County, CA population by age cohort

To better understand the age distribution of Los Angeles County, CA'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 Los Angeles 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.
Los Angeles County, CA 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 6,478,335 (64.66% 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 2,169,083 21.65%
18 to 64 years 6,478,335 64.66%
85 years and over 1,372,217 13.7%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Los Angeles County's population under 18 was 21.65%, compared to the 22.51% nationwide.
  • Los Angeles County's working population (between 18 and 64) was 64.66%, compared to 61.45% nationwide.
  • Los Angeles County's elderly or the senior population (over 65 age) was 13.70% as compared to 16.04% nationwide.

Los Angeles County, CA population pyramid

Population pyramid for Los Angeles County, CA 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 Los Angeles County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Los Angeles County, CA, is 26.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Los Angeles County, CA, is 20.0.
  • Total dependency ratio for Los Angeles County, CA is 46.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Los Angeles County, CA is 5.0.
The graph shows Los Angeles 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.
Los Angeles County, CA population pyramid i.e. Los Angeles County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Los Angeles County, CA's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 292,103 278,264 570,367
5 to 9 years 296,758 282,924 579,682
10 to 14 years 330,572 312,482 643,054
15 to 19 years 321,453 310,283 631,736
20 to 24 years 338,019 334,716 672,735
25 to 29 years 411,152 402,863 814,015
30 to 34 years 404,755 387,167 791,922
35 to 39 years 367,368 351,890 719,258
40 to 44 years 335,872 334,399 670,271
45 to 49 years 336,497 337,334 673,831
50 to 54 years 331,853 331,431 663,284
55 to 59 years 312,265 325,966 638,231
60 to 64 years 283,156 295,876 579,032
65 to 69 years 217,476 243,411 460,887
70 to 74 years 153,886 189,101 342,987
75 to 79 years 96,045 126,361 222,406
80 to 84 years 66,416 92,958 159,374
85 years and over 68,082 118,481 186,563
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Things to know

What is the population of Los Angeles County, CA under 18?

Los Angeles County's population under the age of 18 is 2,169,083, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.65% of the total resident population of Los Angeles County, CA.

What is the aging population in Los Angeles County, CA?

Los Angeles County's population aged 65 years and above was 1,372,217. As per the U.S. Census Bureau's American Community Survey, this population is 13.70% of the entire population.

References

Datasets

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

Key observations

The largest age group in Los Angeles County, CA was for the group of age 25-29 years with a population of 814,015 (8.12%), according to the 2021 American Community Survey. At the same time, the smallest age group in Los Angeles County, CA was the 80-84 years with a population of 159,374 (1.59%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the Los Angeles 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 Los Angeles 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.

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

Los Angeles County, CA 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 Los Angeles County, CA population pyramid, which represents the Los Angeles 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 Los Angeles County, CA, is 26.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Los Angeles County, CA, is 20.0.
  • Total dependency ratio for Los Angeles County, CA is 46.2.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Los Angeles County, CA is 5.0.

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

Explore related topics

Los Angeles County, CA Demographics Los Angeles County, CA 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