Where is sonoma county located? Sonoma County is known for bucolic vineyards, marine reserves, 19th-century historical sights, and Slow-noma way of living. Incorporated on February 18, 1850, Sonoma County is located along the West Coast in Northern California. The county seat is Santa Rosa, which is the largest city in California's North Coast and North Bay region.What is the zip code for sonoma county? The Sonoma Zip Code is 95476. If you want to send a mail to Sonoma City, you should use the 95476 Zip Code.What is the largest city in sonoma county? SANTA ROSA. Santa Rosa is the largest city in Sonoma County with a population of over 175,000. Neighborhoods range from downtown urban to hilltop view properties overlooking Bennett and Sonoma Valleys. Santa Rosans enjoy a culture here with a flavor all its own; a mix of art, music, craft beverages and bikes, to name a few.
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