How many people live in Solano County, CA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 455,100 people living in Solano County, CA. That makes Solano County the 19th-most populous county in California. It is home to 1.2% of people living in the state.
455K
population of Solano County, CA (2024)
1.2%
County share of the California population (2024)
About 455,100 people lived in Solano County, CA in 2024.
Population estimates, 2000–2024
What are Solano County, CA’s age demographics?
About 83,900 Solano County residents are aged 65 and older in 2024. That represents 18.4% of its population. For comparison, the age group represents 16.6% of California’s population and 18% in the US overall.
Another 97,500 Solano County residents, or 21.4% 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 lower share of Solano County, CA's population is aged 18–24 than the US as a whole.
Population estimates by age group, (2024)
What are Solano County, CA’s racial and ethnic demographics?
Hispanic residents make up 30.9% of the Solano County, CA population, higher than the national share of 20%. Solano County, CA also has a larger share of people identifying as non-Hispanic Asian (16.9%) than the US overall (6.5%).
In contrast, Solano County’s non-Hispanic white population accounts for 32.5%, below the 57.5% nationwide, and the non-Hispanic American Indian and Alaska Native population makes up 0.39% of the county, compared with 0.72% 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.
Solano County, CA has a higher share of a non-Hispanic Black or African American population than California as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Solano County, CA is Vallejo with about 123,500 residents in 2024.
Cities and towns in Solano County, CA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Vallejo | 123,475 |
| 2. | Fairfield | 122,646 |
| 3. | Vacaville | 103,994 |
| 4. | Suisun City | 29,614 |
| 5. | Benicia | 26,477 |
| 6. | Dixon | 20,296 |
| 7. | Rio Vista | 10,248 |
| 8. | Balance of Solano County | 18,351 |
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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.
