Santa Rosa is the county seat of Sonoma County, California, USA. As of July 1, 2005, the population of Santa Rosa was approximately 156,200 residents.
Santa Rosa is the largest city in California’s wine country and fifth largest city in the San Francisco Bay Area, after San Jose, San Francisco, Oakland, and Fremont. Santa Rosa’s Metropolitan Statistical Area is approximately 466,477 residents, making it the 12th largest in California and the 102nd largest in the United States.
In addition to being the largest city in the county, Santa Rosa has the most diversity of ethnic groups, neighborhoods, and shopping. Santa Rosa official website