How many people live in Siskiyou County, CA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 42,500 people living in Siskiyou County, CA. That makes Siskiyou County the 45th-most populous county in California. It is home to 0.11% of people living in the state.
42.5K
population of Siskiyou County, CA (2024)
0.11%
County share of the California population (2024)
About 42,500 people lived in Siskiyou County, CA in 2024.
Population estimates, 2000–2024
What are Siskiyou County, CA’s age demographics?
About 12,400 Siskiyou County, CA residents are aged 65 and older in 2024. That represents 29.3% of its population. For comparison, the age group represents 16.6% of California’s population and 18% in the US overall.
Another 8,200 Siskiyou County, CA residents, or 19.3% 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 Siskiyou County, CA's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Siskiyou County, CA’s racial and ethnic demographics?
Non-Hispanic white residents make up 73.5% of the Siskiyou County, CA population, higher than the national share of 57.5%. Siskiyou County, CA also has a larger share of people identifying as non-Hispanic two or more races (4.8%) than the US overall (2.5%).
In contrast, Siskiyou County’s non-Hispanic Black or African American population accounts for 1.3%, below the 12.6% nationwide, and the Hispanic population makes up 14.2% of the county, compared with 20% 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.
Siskiyou 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 Siskiyou County, CA is Yreka with about 7,700 residents in 2024.
Cities and towns in Siskiyou County, CA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Yreka | 7,686 |
| 2. | Mount Shasta | 3,124 |
| 3. | Weed | 2,633 |
| 4. | Dunsmuir | 1,618 |
| 5. | Montague | 1,170 |
| 6. | Tulelake | 857 |
| 7. | Dorris | 817 |
| 8. | Fort Jones | 669 |
| 9. | Etna | 643 |
| 10. | Balance of Siskiyou County | 23,281 |
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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.
