Santa Rosa is a city located in Sonoma County, California, United States. As of the 2020 census, the city had a population of approximately 177,586 people, making it the largest city in Sonoma County. Santa Rosa is known for its wine production and is considered one of the top wine regions in the United States. The city is also home to several parks, cultural attractions, and a vibrant downtown area. Additionally, Santa Rosa is known for its proximity to natural beauty, including the Russian River and nearby redwood forests.