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Alameda County, CA Population by Age

The median age in Alameda County, CA is 38.0, as per 2021 ACS 5-Year Estimates. Of the total population, 17.18% were under the age of 15, 19.21% aged 15 to 29, 49.62% aged 30 to 64, 12.23% aged 65 to 84, and 1.76% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

Alameda County, CA population age distribution

A complete breakdown of Alameda 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 94,055 5.62%
5 to 9 years 95,429 5.7%
10 to 14 years 97,972 5.86%
15 to 19 years 96,036 5.74%
20 to 24 years 95,778 5.72%
25 to 29 years 129,678 7.75%
30 to 34 years 143,720 8.59%
35 to 39 years 137,583 8.22%
40 to 44 years 120,674 7.21%
45 to 49 years 114,640 6.85%
50 to 54 years 108,671 6.5%
55 to 59 years 107,130 6.4%
60 to 64 years 97,771 5.84%
65 to 69 years 78,109 4.67%
70 to 74 years 62,795 3.75%
75 to 79 years 38,225 2.28%
80 to 84 years 25,442 1.52%
85 years and over 29,425 1.76%
Exploring Alameda County's Diversity? Request Customized Data Now!

TABLE OF CONTENTS

Alameda County, CA population by age group

Key stats
479,270
Population under 25 years
531,655
Population aged 25-44
428,212
Population aged 45-64
233,996
Population aged 65+

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

The graph shows Alameda 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
Alameda County, CA population by age group. The largest age group was 30-34 years with a poulation of 143,720 (8.59% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Alameda County, CA was for the group of age 30-34 years with a population of 143,720 (8.59%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Alameda County, CA was the 80-84 years with a population of 25,442 (1.52%).

Alameda County, CA population by age cohort

To better understand the age distribution of Alameda 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 Alameda 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.
Alameda 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 1,095,049 (65.45% 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 344,088 20.57%
18 to 64 years 1,095,049 65.45%
85 years and over 233,996 13.99%
Exploring Alameda County's Diversity? Request Customized Data Now!

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

  • Alameda County's population under 18 was 20.57%, compared to the 22.51% nationwide.
  • Alameda County's working population (between 18 and 64) was 65.45%, compared to 61.45% nationwide.
  • Alameda County's elderly or the senior population (over 65 age) was 13.99% as compared to 16.04% nationwide.

Alameda County, CA population pyramid

Population pyramid for Alameda 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 Alameda County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Alameda County, CA, is 25.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Alameda County, CA, is 20.3.
  • Total dependency ratio for Alameda County, CA is 45.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Alameda County, CA is 4.9.
The graph shows Alameda 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.
Alameda County, CA population pyramid i.e. Alameda County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Age Group Population(Male) Population(Female) Total Population
Under 5 years 48,041 46,014 94,055
5 to 9 years 49,116 46,313 95,429
10 to 14 years 50,055 47,917 97,972
15 to 19 years 48,563 47,473 96,036
20 to 24 years 47,679 48,099 95,778
25 to 29 years 64,937 64,741 129,678
30 to 34 years 72,187 71,533 143,720
35 to 39 years 68,726 68,857 137,583
40 to 44 years 61,383 59,291 120,674
45 to 49 years 57,546 57,094 114,640
50 to 54 years 54,709 53,962 108,671
55 to 59 years 52,915 54,215 107,130
60 to 64 years 47,830 49,941 97,771
65 to 69 years 36,588 41,521 78,109
70 to 74 years 28,945 33,850 62,795
75 to 79 years 16,975 21,250 38,225
80 to 84 years 10,879 14,563 25,442
85 years and over 10,482 18,943 29,425
Exploring Alameda County's Diversity? Request Customized Data Now!

Things to know

What is the population of Alameda County, CA under 18?

Alameda County's population under the age of 18 is 344,088, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 20.57% of the total resident population of Alameda County, CA.

What is the aging population in Alameda County, CA?

Alameda County's population aged 65 years and above was 233,996. As per the U.S. Census Bureau's American Community Survey, this population is 13.99% of the entire population.

References

Datasets

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

Key observations

The largest age group in Alameda County, CA was for the group of age 30-34 years with a population of 143,720 (8.59%), according to the 2021 American Community Survey. At the same time, the smallest age group in Alameda County, CA was the 80-84 years with a population of 25,442 (1.52%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

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

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

Alameda 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 Alameda County, CA population pyramid, which represents the Alameda 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 Alameda County, CA, is 25.0.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Alameda County, CA, is 20.3.
  • Total dependency ratio for Alameda County, CA is 45.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Alameda County, CA is 4.9.

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