How many people live in Lassen County, CA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 28,300 people living in Lassen County, CA. That makes Lassen County the 47th-most populous county in California. It is home to 0.07% of people living in the state.
28.3K
population of Lassen County, CA (2024)
0.07%
County share of the California population (2024)
About 28,300 people lived in Lassen County, CA in 2024.
Population estimates, 2000–2024
What are Lassen County, CA’s age demographics?
About 5,400 Lassen County, CA residents are aged 65 and older in 2024. That represents 18.9% of its population. For comparison, the age group represents 16.6% of California's population and 18% in the US overall.
Another 5,400 Lassen County residents, or 18.9% 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 Lassen County, CA's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Lassen County, CA’s racial and ethnic demographics?
Non-Hispanic white residents make up 62.8% of the Lassen County, CA population, higher than the national share of 57.5%. Lassen County, CA also has a larger share of people identifying as Hispanic (22.3%) than the US overall (20%).
In contrast, Lassen County’s non-Hispanic Black or African American population accounts for 6.1%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 1.7% 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.
Lassen 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 Lassen County, CA is Susanville with about 12,400 residents in 2024.
Cities and towns in Lassen County, CA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Susanville | 12,359 |
| 2. | Balance of Lassen County | 15,981 |
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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.
