Colusa County, California

Colusa County
County
Colusa National Wildlife Refuge Butte Sink Bear Valley Arbuckle Mendocino Forest
Seal
Location in the state of California
Interactive map of Colusa County
Country	United States
State	California
Region	Sacramento Valley
Incorporated	February 18, 1850
Named for	Rancho Colus
County seat	Colusa
Largest city	Colusa (population) Williams (area)
Government
• Type	Council–CAO
• Chair	Jose Merced Corona
• Vice Chair	Janice Bell
• Board of Supervisors	Supervisors Jose Merced Corona Daurice Kalfsbeek Smith Kent S. Boes Randy Wilson Janice Bell
• County Administrative Officer	Joshua Pack
Area
• Total	1,156 sq mi (2,990 km2)
• Land	1,151 sq mi (2,980 km2)
• Water	5.6 sq mi (15 km2)
Highest elevation	7,059 ft (2,152 m)
Population  (2020)
• Total	21,839
• Estimate  (2025)	21,836
• Density	18.97/sq mi (7.326/km2)
GDP
• Total	$1.781 billion (2022)
Time zone	UTC-8 (Pacific Time Zone)
• Summer (DST)	UTC-7 (Pacific Daylight Time)
Area code	530
Congressional district	1st
Website	www.countyofcolusa.org

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Colusa County (/kəˈluːsə/ ^ⓘ) is a county located in the U.S. state of California. As of the 2020 census, the population was 21,839. The county seat is Colusa. It is in the northern Sacramento Valley, northwest of the state capital, Sacramento.