The San Francisco Bay Area, commonly known as the Bay Area, is a populated region that surrounds the San Francisco and San Pablo estuaries in Northern California, United States. The region encompasses the major cities and metropolitan areas of San Francisco, Oakland, and San Jose, along with smaller urban and rural areas. The Bay Area's nine counties are Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma. Home to approximately 7.15 million people, the nine-county Bay Area contains many cities, towns, airports, and associated regional, state, and national parks, connected by a network of roads, highways, railroads, bridges, tunnels and commuter rail. The combined urban area of San Jose and San Francisco is the largest in Northern California, the second largest in California, and the 55th largest urban area in the world. The nine-county definition of the San Francisco Bay Area is not recognized by the United States Census Bureau; rather, they define a larger 11-county Combined Statistical Area (CSA) designated the San Jose-San Francisco-Oakland, CA CSA, including Santa Cruz and San Benito counties to the south; counties that do not have a border on the San Francisco Bay but are tied economically to counties that do. As of the 2010 U.S. Census, this larger CSA contains 7.46 million people—the sixth-largest CSA in the U.S. The San Francisco Bay Area is renowned for its natural beauty, liberal politics, entrepreneurship, and diversity. The area has high incomes; it includes the five highest California counties by per capita income and two of the top 25 wealthiest counties in the United States.
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