Siskiyou County, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 45th-largest in California
The population of Siskiyou County, California is 43,834 as of the 2023 American Community Survey, making it the 45th-largest county in California. The median household income is $55,499, the median home value is $284,500, and the median age is 47.4.
The population of Siskiyou County has declined 5.4% since 2010 (44,941 → 42,498), a -0.40% annualized rate.
43,834
Population
-0.40%
Annual growth
7
People / sq mi
$55,499
Median Income
$284,500
Median Home Value
Siskiyou County covers 6,279 sq mi of land at 7.0 people per square mile.
About Siskiyou County, CA
Age is the most distinctive thing about Siskiyou County: a median age of 47.4, older than the national median. Siskiyou County is a county in California with a population of 43,834. It ranks #45 among counties in California by population.
Incomes run on the lower side: a median household income of $55,499, below the US median of $78,538. About 11.6% of residents live below the federal poverty level, below the national 12.4%. Home values run above average at $284,500, with typical rent around $1,043.
Roughly 23.1% of adults have a bachelor’s, below the national 35.0%. About 10.2% of workers primarily work from home, below the national 14.0%, and the average commute runs about 20 minutes each way.
The age structure shapes everything downstream in Siskiyou County — from housing demand to the mix of working-age earners reflected in the income figures above.
Siskiyou County Population History (2010-2024)
The county of Siskiyou County had a population of 44,941 in 2010 and 42,498 in 2024, a -5.4% growth over 14 years. The peak was 44,941 in 2010. Average annual growth rate: -0.40%.
42,498
Population (2024)
44,941
Population (2010)
44,941
Peak (2010)
-0.40%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 44,941 |
| 2011 | 44,622 |
| 2012 | 44,091 |
| 2013 | 43,550 |
| 2014 | 43,357 |
| 2015 | 43,275 |
| 2016 | 43,402 |
| 2017 | 43,647 |
| 2018 | 43,624 |
| 2019 | 43,663 |
| 2020 | 43,999 |
| 2021 | 44,144 |
| 2022 | 43,746 |
| 2023 | 42,941 |
| 2024 | 42,498 |
Race & Ethnicity
| White | 79.4% |
| Black or African American | 1.7% |
| Asian | 0.1% |
| Hispanic or Latino (any race) | 7.6% |
| Two or More Races | 0.0% |
Age & Sex
47.4
Median Age
50.0%
Female
50.0%
Male
27.2%
Age 65+
Age Distribution
Children (under 15): 16.6% · Seniors (65+): 27.2%
Income & Poverty
| Median household income | $55,499$-40,835 vs state |
| Mean household income | $76,699 |
| Per-capita income | $34,074 |
| Poverty rate | 11.6%+3.2% vs state |
| Unemployment rate | 3.9% |
| Employment-to-population | 46.5% |
Top Industries by Employment
The largest employment sector in Siskiyou County is professional & business services, accounting for 27.1% of workers.
How residents commute
0.8%
Drive alone
3.4%
Carpool
74.7%
Public transit
10.2%
Work from home
20.3 min
Avg commute
Housing
$284,500$-410,900 vs state
Median home value
$1,043
Median rent
69.7%
Homeownership rate
23,066
Total housing units
82.0%
Occupied
18.0%
Vacant
30.3%
Renter-occupied
Social & access
93.6%
With health insurance
92.6%
With broadband internet
28.8%
Foreign-born
10.4%
Veterans (18+)
17.5%
With a disability
90.3%
Speak language other than English at home
Education
91.1%
High School+
23.1%
Bachelor's+
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County rankings
Frequently Asked Questions
Siskiyou County, California has a population of 43,834 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 45th-largest county in California. Population density is 7 people per square mile.
The population of Siskiyou County has declined 5.4% since 2010 (44,941 → 42,498), a -0.40% annualized rate.
The median household income in Siskiyou County, California is $55,499, with mean (average) household income of $76,699 and per-capita income of $34,074. 11.6% of residents live below the federal poverty level.
In Siskiyou County, the largest racial and ethnic groups are White (79.4%), Hispanic or Latino (7.6%), Black or African American (1.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Siskiyou County, California is 47.4 years. Residents are 50.0% female and 50.0% male.
The median home value in Siskiyou County is $284,500 and median monthly rent is $1,043. 69.7% of occupied housing units are owner-occupied. The county has 23,066 total housing units, 18.0% of which are vacant.
The largest employment sector in Siskiyou County, California is professional, scientific, and management services, employing 27.1% of workers. The unemployment rate is 3.9%.
Los Angeles is among the largest cities associated with Siskiyou County, California, with a population of 3,857,897.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.