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How does Sonoma County rank in terms of wealth? SmartAsset calculated a Wealth Index for all California counties based on their data sources and ranked them. In terms of median income, Sonoma County is the 14th best county in the state with a median income of about $91-thousand dollars. That’s above the state median income by about $7-thousand dollars. Marin County came in 3rd overall while Napa County was 9th. Mendocino and Lake Counties ranked towards the bottom of the list at 47th and 50th respectively. Overall number one? No surpirse. It’s Santa Clara County with a median income of $140-thousand dollars.