Sonoma County is located in the U.S. state of California. As of the 2020 United States Census, its population was 488,863. Its seat of government and largest city is Santa Rosa.

The Pomo are a Native American people of California. Historical Pomo territory in Northern California was large, bordered by the Pacific Coast to the west, extending inland to Clear Lake, mainly between Cleone and Duncans Point. One small group, the Tceefoka, lived in the vicinity of present-day Stonyford, Colusa County, were they were separated from the majority of Pomo lands by Yuki and Wintuan speakers.