There was a total of nearly $892 million of farms and ranches for sale in California's Sonoma County recently on Land.com. The total of all Sonoma County farms, ranches, and rural real estate for sale was approximately 100,000 acres. Sonoma County ranks 13th in the Golden State for the total number of acres of land currently advertised for sale. Among cities in Sonoma County with farms and ranches for sale, Santa Rosa had the most land for sale. Based on its natural assets, Sonoma County's economy is dependent on tourism and recreation. Sonoma County is California's 28th biggest county (1,767 square miles). It's located in the North Coast California region of California.