Sonoma County, California
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|Sonoma County, California|
Location in the state of California
California's location in the U.S.
1,768 sq mi (4,579 km²)
1,576 sq mi (4,082 km²)
192 sq mi (497 km²), 10.88%
290/sq mi (112/km²)
Sonoma County is a county in Northern California. The county seat is in Santa Rosa. To the south of Sonoma County is Marin County, to the north is Mendocino County, to the east is Napa County, and to the northeast is Lake County.