How many people live in Alameda County, CA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 1.65 million people living in Alameda County, CA. That makes Alameda County the 22nd-most populous county in the US. It is also the seventh-largest in California, accounting for 4.2% of the state’s population.
1.65M
population of Alameda County, CA (2024)
4.2%
County share of the California population (2024)
About 1.65 million people lived in Alameda County, CA in 2024.
Population estimates, 2000–2024
What are Alameda County, CA’s age demographics?
About 270,800 Alameda County residents are aged 65 and older in 2024. That represents 16.4% of its population. For comparison, the age group represents 16.6% of California’s population and 18% in the US overall.
Another 316,600 Alameda County residents, or 19.2% of the population, were children under 18. For comparison, the age group represents 21.4% of California’s population and 21.6% in the US overall.
A higher share of Alameda County, CA's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Alameda County, CA’s racial and ethnic demographics?
Non-Hispanic Asian residents make up 34.7% of the Alameda County, CA population, higher than the national share of 6.5%. Alameda County, CA also has a larger share of people identifying as Hispanic (23.6%) than the US overall (20%).
In contrast, Alameda County’s non-Hispanic white population accounts for 27.1%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 9.4% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Alameda County, CA has a higher share of a non-Hispanic Asian population than California as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Alameda County, CA is Oakland with about 443,600 residents in 2024.
Cities and towns in Alameda County, CA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Oakland | 443,554 |
| 2. | Fremont | 228,192 |
| 3. | Hayward | 158,440 |
| 4. | Berkeley | 121,749 |
| 5. | San Leandro | 86,571 |
| 6. | Livermore | 84,867 |
| 7. | Alameda | 78,795 |
| 8. | Pleasanton | 75,664 |
| 9. | Dublin | 70,544 |
| 10. | Union City | 66,196 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
