Explore Sonoma County. Laid-back Sonoma County in Northern California is a wine, food, and nature lover’s dream, captivating visitors with its stunning landscapes, quaint towns, locally-focused restaurants, and multigenerational family-owned wineries. This vast growing region (roughly double the size of neighboring Napa Valley) is made up of. Only 26% of the households in Sonoma County can afford a house at the median price of $585,000. The minimum income needed to qualify for a home in the median price range is $114,000/year. The median household income in Sonoma County is $66,640/year. If you make the median income of $66,640, you can afford a home that costs as much as $394,066.