Santa Rosa (Spanish for '"Saint Rose"') is a city and the county seat of Sonoma County, in the North Bay region of the Bay Area in California. Its estimated 2019 population was 176,753. It is the largest city in California's Wine Country and Redwood Coast, as well as the fifth most populous city in the Bay Area after San Jose, San Francisco, Oakland, and Fremont; and the 27th most populous city in California.
Sonoma is a city in Sonoma County, California in Sonoma Valley. Known as a part of Wine Country in the Sonoma Valley AVA Appellation, Sonoma is the home of the Sonoma International Film Festival and a historic town plaza, a remnant of the town's Mexican colonial past. Sonoma's population was 10,648 as of the 2010 census, while the Sonoma urban area had a population of 32,678.