Santa Rosa is the county seat of Sonoma County, California United States. The 2010 census reported a population of 167,815. Santa Rosa is the largest city in California's North Coast, Wine Country and the North Bay; the fifth most populated city in the San Francisco Bay Area after San Jose, San Francisco, Oakland, and Fremont; and the 26th most populated city in California. The first known permanent European settlement of Santa Rosa was the homestead of the Carrillo family, in-laws to Mariano Guadalupe Vallejo, who settled the Sonoma pueblo and Petaluma area. In the 1830s, during the Mexican period, the family of Mara Lpez de Carrillo built an adobe house on their Rancho Cabeza de Santa Rosa land grant, just east of what later became downtown Santa Rosa.
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