Santa Clara County, CA Population by Age

The median age in Santa Clara County, CA is 37.5, as per 2021 ACS 5-Year Estimates. Of the total population, 18.08% were under the age of 15, 19.95% aged 15 to 29, 48.41% aged 30 to 64, 11.65% aged 65 to 84, and 1.91% were 85 years of age and older.
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Updated Sep 17, 2023

Santa Clara County, CA population age distribution

A complete breakdown of Santa Clara 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 110,990 5.74%
5 to 9 years 113,979 5.9%
10 to 14 years 124,430 6.44%
15 to 19 years 117,582 6.09%
20 to 24 years 115,669 5.99%
25 to 29 years 152,096 7.87%
30 to 34 years 157,486 8.15%
35 to 39 years 146,806 7.6%
40 to 44 years 134,769 6.98%
45 to 49 years 134,876 6.98%
50 to 54 years 129,640 6.71%
55 to 59 years 125,108 6.48%
60 to 64 years 106,702 5.52%
65 to 69 years 85,960 4.45%
70 to 74 years 63,185 3.27%
75 to 79 years 44,901 2.32%
80 to 84 years 30,979 1.6%
85 years and over 36,864 1.91%
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Santa Clara County, CA population by age group

Key stats
582,650
Population under 25 years
591,157
Population aged 25-44
496,326
Population aged 45-64
261,889
Population aged 65+

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

The graph shows Santa Clara 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
Santa Clara County, CA population by age group. The largest age group was 30-34 years with a poulation of 157,486 (8.15% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Santa Clara County, CA was for the group of age 30-34 years with a population of 157,486 (8.15%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Santa Clara County, CA was the 80-84 years with a population of 30,979 (1.60%).

Santa Clara County, CA population by age cohort

To better understand the age distribution of Santa Clara 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 Santa Clara 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.
Santa Clara 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 1,248,070 (64.60% 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 422,063 21.85%
18 to 64 years 1,248,070 64.6%
85 years and over 261,889 13.56%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Santa Clara County's population under 18 was 21.85%, compared to the 22.51% nationwide.
  • Santa Clara County's working population (between 18 and 64) was 64.60%, compared to 61.45% nationwide.
  • Santa Clara County's elderly or the senior population (over 65 age) was 13.56% as compared to 16.04% nationwide.

Santa Clara County, CA population pyramid

Population pyramid for Santa Clara 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 Santa Clara County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Santa Clara County, CA, is 26.5.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Santa Clara County, CA, is 19.8.
  • Total dependency ratio for Santa Clara County, CA is 46.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Santa Clara County, CA is 5.0.
The graph shows Santa Clara 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.
Santa Clara County, CA population pyramid i.e. Santa Clara County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 57,514 53,476 110,990
5 to 9 years 58,968 55,011 113,979
10 to 14 years 63,370 61,060 124,430
15 to 19 years 60,307 57,275 117,582
20 to 24 years 60,422 55,247 115,669
25 to 29 years 82,254 69,842 152,096
30 to 34 years 84,345 73,141 157,486
35 to 39 years 77,321 69,485 146,806
40 to 44 years 68,836 65,933 134,769
45 to 49 years 68,589 66,287 134,876
50 to 54 years 66,286 63,354 129,640
55 to 59 years 63,066 62,042 125,108
60 to 64 years 54,500 52,202 106,702
65 to 69 years 41,121 44,839 85,960
70 to 74 years 29,105 34,080 63,185
75 to 79 years 20,683 24,218 44,901
80 to 84 years 13,090 17,889 30,979
85 years and over 14,047 22,817 36,864
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Things to know

What is the population of Santa Clara County, CA under 18?

Santa Clara County's population under the age of 18 is 422,063, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.85% of the total resident population of Santa Clara County, CA.

What is the aging population in Santa Clara County, CA?

Santa Clara County's population aged 65 years and above was 261,889. As per the U.S. Census Bureau's American Community Survey, this population is 13.56% of the entire population.

References

Datasets

Explore datasets by year of publication.
2023
Santa Clara County, CA Age Group Population Dataset: A complete breakdown of Santa Clara 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 Santa Clara 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 Santa Clara County. The dataset can be utilized to understand the population distribution of Santa Clara County by age. For example, using this dataset, we can identify the largest age group in Santa Clara County.

Key observations

The largest age group in Santa Clara County, CA was for the group of age 30-34 years with a population of 157,486 (8.15%), according to the 2021 American Community Survey. At the same time, the smallest age group in Santa Clara County, CA was the 80-84 years with a population of 30,979 (1.60%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Santa Clara County, CA Age Cohorts Dataset: Children, Working Adults, and Seniors in Santa Clara 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 Santa Clara 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 Santa Clara 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.

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

Santa Clara County, CA 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 Santa Clara County, CA population pyramid, which represents the Santa Clara 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 Santa Clara County, CA, is 26.5.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Santa Clara County, CA, is 19.8.
  • Total dependency ratio for Santa Clara County, CA is 46.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Santa Clara County, CA is 5.0.

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