Siskiyou County, California

Siskiyou County
Motto: 
"Mountains of Opportunity"
Interactive map of Siskiyou County
Location in the state of California
Coordinates: 41°35′N 122°30′W / 41.583°N 122.500°W / 41.583; -122.500
CountryUnited States
StateCalifornia
RegionShasta Cascade
IncorporatedMarch 22, 1852
Named afterThe Siskiyou Trail
County seatYreka
Largest cityYreka
Government
 • TypeCouncil–Administrator
 • ChairRay A. Haupt
 • Vice ChairJess W. Harris
 • Board of Supervisors
Supervisors
  • Jess W. Harris
  • Ed Valenzuela
  • Michael N. Kobseff
  • Nancy Ogren
  • Ray A. Haupt
 • County AdministratorTerry Barber
Area
 • Total
6,347 sq mi (16,440 km2)
 • Land6,278 sq mi (16,260 km2)
 • Water69 sq mi (180 km2)
Highest elevation
14,162 ft (4,317 m)
Population
 (2020)
 • Total
44,076
 • Estimate 
(2024)
42,498
 • Density7.021/sq mi (2.711/km2)
GDP
 • Total$2.008 billion (2022)
Time zoneUTC−8 (Pacific Time Zone)
 • Summer (DST)UTC−7 (Pacific Daylight Time)
Area code530
FIPS code06-093
GNIS feature ID277311
Congressional district1st
Websiteco.siskiyou.ca.us

Siskiyou County (/ˈsɪskjuː/ SISK-yoo) is a county located in the northwestern portion of the U.S. state of California. As of the 2020 census, the population was 44,076. Its county seat is Yreka and its highest point is Mount Shasta. It falls within the Cascadia bioregion.

Siskiyou County is in the Shasta Cascade region along the Oregon border. Because of its outdoor recreation, Mt. Shasta, McCloud River, and Gold Rush-era history, it is an important tourist destination within the state.