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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 United States Office of Management and Budget does not use the nine-county definition of the San Francisco Bay Area. The OMB has designated a more extensive 12-county Combined Statistical Area titled the San Jose-San Francisco-Oakland, CA Combined Statistical Area which also includes the three counties of San Joaquin, Santa Cruz, and San Benito that do not border San Francisco Bay, but are economically tied to the nine counties that do. (via Freebase)