How many people live in Sonoma County, CA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 485,400 people living in Sonoma County, CA. That makes Sonoma County the 17th-most populous county in California. It is home to 1.2% of people living in the state.
485K
population of Sonoma County, CA (2024)
1.2%
County share of the California population (2024)
About 485,400 people lived in Sonoma County, CA in 2024.
Population estimates, 2000–2024
What are Sonoma County, CA’s age demographics?
About 110,500 Sonoma County, CA residents are aged 65 and older in 2024. That represents 22.8% of its population. For comparison, the age group represents 16.6% of California’s population and 18% in the US overall.
Another 89,400 Sonoma County residents, or 18.4% 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 Sonoma County, CA's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Sonoma County, CA’s racial and ethnic demographics?
Non-Hispanic white residents make up 58.2% of the Sonoma County, CA population, higher than the national share of 57.5%. Sonoma County, CA also has a larger share of people identifying as Hispanic (31%) than the US overall (20%).
In contrast, Sonoma County’s non-Hispanic Black or African American population accounts for 1.7%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 4.9% of the county, compared with 6.5% 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.
Sonoma County, CA has a higher share of a non-Hispanic white population than California as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Sonoma County, CA is Santa Rosa with about 177,500 residents in 2024.
Cities and towns in Sonoma County, CA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Santa Rosa | 177,524 |
| 2. | Petaluma | 59,393 |
| 3. | Rohnert Park | 44,894 |
| 4. | Windsor | 25,846 |
| 5. | Healdsburg | 11,231 |
| 6. | Sonoma | 10,606 |
| 7. | Cloverdale | 8,784 |
| 8. | Cotati | 7,403 |
| 9. | Sebastopol | 7,388 |
| 10. | Balance of Sonoma County | 132,306 |
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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.
