How many people live in Colusa County, CA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 22,100 people living in Colusa County, CA. That makes Colusa County the 50th-most populous county in California. It is home to 0.06% of people living in the state.
22.1K
population of Colusa County, CA (2024)
0.06%
County share of the California population (2024)
About 22,100 people lived in Colusa County, CA in 2024.
Population estimates, 2000–2024
What are Colusa County, CA’s age demographics?
About 3,600 Colusa County residents are aged 65 and older in 2024. That represents 16.2% of its population. For comparison, the age group represents 16.6% of California’s population and 18% in the US overall.
Another 5,800 Colusa County residents, or 26.5% 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 Colusa County, CA's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Colusa County, CA’s racial and ethnic demographics?
Hispanic residents make up 64.2% of the Colusa County, CA population, higher than the national share of 20%. Colusa County, CA also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (1.4%) than the US overall (0.72%).
In contrast, Colusa County’s non-Hispanic white population accounts for 30.2%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 1% 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.
Colusa County, CA has a higher share of a Hispanic population than California as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Colusa County, CA is Colusa with about 6,600 residents in 2024.
Cities and towns in Colusa County, CA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Colusa | 6,589 |
| 2. | Williams | 5,598 |
| 3. | Balance of Colusa County | 9,887 |
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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.
