San Diego County, CA Population by Age

The median age in San Diego County, CA is 36.3, as per 2021 ACS 5-Year Estimates. Of the total population, 18.09% were under the age of 15, 21.81% aged 15 to 29, 45.99% aged 30 to 64, 12.30% aged 65 to 84, and 1.80% were 85 years of age and older.
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Updated Sep 17, 2023

San Diego County, CA population age distribution

A complete breakdown of San Diego 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 198,377 6.02%
5 to 9 years 191,887 5.82%
10 to 14 years 206,127 6.25%
15 to 19 years 207,669 6.3%
20 to 24 years 240,936 7.31%
25 to 29 years 270,456 8.2%
30 to 34 years 264,425 8.02%
35 to 39 years 238,552 7.24%
40 to 44 years 214,765 6.52%
45 to 49 years 204,357 6.2%
50 to 54 years 201,843 6.12%
55 to 59 years 202,794 6.15%
60 to 64 years 189,265 5.74%
65 to 69 years 155,118 4.71%
70 to 74 years 121,334 3.68%
75 to 79 years 76,083 2.31%
80 to 84 years 53,016 1.61%
85 years and over 59,313 1.8%
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San Diego County, CA population by age group

Key stats
1,044,996
Population under 25 years
988,198
Population aged 25-44
798,259
Population aged 45-64
464,864
Population aged 65+

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

The graph shows San Diego 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
San Diego County, CA population by age group. The largest age group was 25-29 years with a poulation of 270,456 (8.20% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in San Diego County, CA was for the group of age 25-29 years with a population of 270,456 (8.20%), according to the 2021 American Community Survey.

At the same time, the smallest age group in San Diego County, CA was the 80-84 years with a population of 53,016 (1.61%).

San Diego County, CA population by age cohort

To better understand the age distribution of San Diego 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 San Diego 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.
San Diego 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 2,117,615 (64.24% 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 713,838 21.66%
18 to 64 years 2,117,615 64.24%
85 years and over 464,864 14.1%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • San Diego County's population under 18 was 21.66%, compared to the 22.51% nationwide.
  • San Diego County's working population (between 18 and 64) was 64.24%, compared to 61.45% nationwide.
  • San Diego County's elderly or the senior population (over 65 age) was 14.10% as compared to 16.04% nationwide.

San Diego County, CA population pyramid

Population pyramid for San Diego 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 San Diego County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for San Diego County, CA, is 26.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for San Diego County, CA, is 20.8.
  • Total dependency ratio for San Diego County, CA is 47.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for San Diego County, CA is 4.8.
The graph shows San Diego 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.
San Diego County, CA population pyramid i.e. San Diego County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 101,638 96,739 198,377
5 to 9 years 98,571 93,316 191,887
10 to 14 years 105,316 100,811 206,127
15 to 19 years 108,476 99,193 207,669
20 to 24 years 133,771 107,165 240,936
25 to 29 years 141,859 128,597 270,456
30 to 34 years 137,543 126,882 264,425
35 to 39 years 122,188 116,364 238,552
40 to 44 years 111,199 103,566 214,765
45 to 49 years 103,001 101,356 204,357
50 to 54 years 101,334 100,509 201,843
55 to 59 years 100,369 102,425 202,794
60 to 64 years 93,238 96,027 189,265
65 to 69 years 73,869 81,249 155,118
70 to 74 years 56,662 64,672 121,334
75 to 79 years 33,469 42,614 76,083
80 to 84 years 22,869 30,147 53,016
85 years and over 22,792 36,521 59,313
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Things to know

What is the population of San Diego County, CA under 18?

San Diego County's population under the age of 18 is 713,838, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.66% of the total resident population of San Diego County, CA.

What is the aging population in San Diego County, CA?

San Diego County's population aged 65 years and above was 464,864. As per the U.S. Census Bureau's American Community Survey, this population is 14.10% of the entire population.

References

Datasets

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

Key observations

The largest age group in San Diego County, CA was for the group of age 25-29 years with a population of 270,456 (8.20%), according to the 2021 American Community Survey. At the same time, the smallest age group in San Diego County, CA was the 80-84 years with a population of 53,016 (1.61%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

Context

The dataset tabulates the San Diego 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 San Diego 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.

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

San Diego 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 San Diego County, CA population pyramid, which represents the San Diego 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 San Diego County, CA, is 26.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for San Diego County, CA, is 20.8.
  • Total dependency ratio for San Diego County, CA is 47.5.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for San Diego County, CA is 4.8.

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

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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