How many people live in ?

Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 15,600 people living in Trinity County, CA. That makes Trinity County the 54th-most populous county in California. It is home to 0.04% of people living in the state.

15.6K

population of Trinity County, CA (2024)

0.04%

County share of the California population (2024)

About 15,600 people lived in Trinity County, CA in 2024.

Population estimates, 2000–2024

What are Trinity County, CA’s age demographics?

About 5,200 Trinity County, CA residents are aged 65 and older in 2024. That represents 33.1% of its population. For comparison, the age group represents 16.6% of California’s population and 18% in the US overall.
Another 2,700 Trinity County, CA residents, or 17.2% 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 Trinity County, CA's population is aged 65 or older than the US as a whole.

Population estimates by age group, (2024)

What are Trinity County, CA’s racial and ethnic demographics?

Non-Hispanic white residents make up 80.6% of the Trinity County, CA population, higher than the national share of 57.5%. Trinity County, CA also has a larger share of people identifying as non-Hispanic two or more races (5%) than the US overall (2.5%).
In contrast, Trinity County’s Hispanic population accounts for 6.8%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.68% 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.

Trinity County, CA has a higher share of a non-Hispanic white population than California as a whole.

Population estimates by race and ethnicity, (2024)

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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.