Sonoma County California Cities/Towns - Bodega Bay, Boyes Hot Springs, Cloverdale, Cotati, El Verano, Forestville, Geyserville, Graton, Guerneville, Healdsburg, Monte Rio, Occidental, Petaluma, Santa Rosa (County Seat), Rohnert Park, Sebastopol, Sonoma, Windsor

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Your Ad Here Sonoma County, located on the northern coast of California. Its population at the 2000 census was 458,614. Its county seat is Santa Rosa. History Sonoma was one of the original counties formed when California became a state in 1850. The Pomo, Coast Miwok and Wappo peoples were the earliest human settlers of Sonoma County, between 5000 to 8000 BC, effectively living within the natural carrying capacity of the land.