Sonoma County is located in the U.S. state of California. As of the 2020 United States Census, its population was 488,863. Its seat of government and largest city is Santa Rosa. Sonoma County comprises the Santa Rosa-Petaluma Metropolitan Statistical Area, which is part of the San Jose-San Francisco-Oakland, CA Combined Statistical Area. It is the northernmost county in the nine-county San Francisco Bay Area region. In California's Wine Country region, which also includes Napa, Mendocino, and Lake counties, Sonoma County is the largest producer. It has thirteen approved American Viticultural Areas and more than 350 wineries. The voters have twice approved open space initiatives that have provided funding for public acquisition of natural areas, preserving forested areas, coastal habitat, and other open space. More than 8.4 million tourists visit each year, spending more than $1 billion in 2016.

Region: San Francisco Bay Area
Incorporated: February 18, 1850
Named for: the city of Sonoma
County seat (and largest city): Santa Rosa
Type: Council–Administrator
Body: Sonoma County Board of Supervisors
Chair: Chris Coursey
Vice Chair: David Rabbitt
Chair Pro Tem: Lynda Hopkins
County Administrator: Sheryl Bratton
Population (2020): 488,863
Time zone: Pacific Time Zone (UTC−8)
Summer (DST): Pacific Daylight Time (UTC−7)
Area code: 707
FIPS code: 06-097
GNIS feature ID: 1657246
Congressional districts: 2nd, 4th
Wikidata description: county in California, United States
Wikidata id: Q108067
Wikidata label: Sonoma County
Wikidata aliases: Array
Source
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