San Francisco Bay Area

Bay AreaSan FranciscoBay Area, CaliforniaSan Francisco Bay Area, CaliforniaSan Francisco BaySF Bay Areathe Bay AreaCalifornia Bay AreaBaySan Francisco metropolitan area
The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California.wikipedia
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San Francisco Bay

BaySan FranciscoSan Francisco Harbor
The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California.
It is surrounded by a contiguous region known as the San Francisco Bay Area (often simply "the Bay Area"), and is dominated by the large cities of San Jose, San Francisco and Oakland.

Northern California

NorthernNorth CaliforniaNorCal
The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California.
Spanning the state's northernmost 48 counties, its main population centers include the San Francisco Bay Area (anchored by the cities of San Jose, San Francisco, and Oakland), the Greater Sacramento area (anchored by the state capital Sacramento), and the Metropolitan Fresno area (anchored by the city of Fresno).

Marin County, California

Marin CountyMarinMarin, California
Although the exact boundaries of the region vary depending on the source, the Bay Area is defined by the Association of Bay Area Governments to include the nine counties that border the aforementioned estuaries: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco.
Marin County is a county located in the San Francisco Bay Area of the U.S. state of California.

California

CAState of CaliforniaCalifornia, USA
The larger combined statistical area of the region, which includes fourteen counties, is the second-largest in California (after the Greater Los Angeles area), the fifth-largest in the United States, and the 41st-largest urban area in the world with 9.67 million people.
The Greater Los Angeles Area and the San Francisco Bay Area are the nation's second- and fifth-most populous urban regions, with 18.7 million and 9.7 million residents respectively.

San Mateo County, California

San Mateo CountySan MateoCounty of San Mateo
Although the exact boundaries of the region vary depending on the source, the Bay Area is defined by the Association of Bay Area Governments to include the nine counties that border the aforementioned estuaries: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco.
San Mateo County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area, and is part of the San Francisco Bay Area, the nine counties bordering San Francisco Bay.

Sonoma County, California

Sonoma CountySonomaSonoma Counties
Although the exact boundaries of the region vary depending on the source, the Bay Area is defined by the Association of Bay Area Governments to include the nine counties that border the aforementioned estuaries: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco.
It is the northwesternmost county in the nine-county San Francisco Bay Area region.

San Jose–San Francisco–Oakland, CA Combined Statistical Area

San Jose-San Francisco-Oakland, CA Combined Statistical AreaCombined Statistical AreaSan Jose-San Francisco-Oakland, CA CSA
The larger combined statistical area of the region, which includes fourteen counties, is the second-largest in California (after the Greater Los Angeles area), the fifth-largest in the United States, and the 41st-largest urban area in the world with 9.67 million people.
The San Jose–San Francisco–Oakland, CA Combined Statistical Area is a 14-county Combined Statistical Area (CSA) designated by the United States Office of Management and Budget in Northern California that includes the San Francisco Bay Area.

San Pablo Bay

San Pablo
The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California.
San Pablo Bay is a tidal estuary that forms the northern extension of San Francisco Bay in the East Bay and North Bay regions of the San Francisco Bay Area in northern California.

Santa Clara County, California

Santa Clara CountySanta ClaraCounty of Santa Clara
Although the exact boundaries of the region vary depending on the source, the Bay Area is defined by the Association of Bay Area Governments to include the nine counties that border the aforementioned estuaries: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco.
Santa Clara is the most populous county in the San Francisco Bay Area and in Northern California.

San Joaquin County, California

San JoaquinSan Joaquin CountyStockton, CA MSA
Other sources may exclude parts of or even entire counties, or expand the definition to include neighboring counties that do not border the bay such as San Benito, San Joaquin, and Santa Cruz.
The county is located in Northern California's Central Valley just east of the very highly populated nine-county San Francisco Bay Area region and is separated from the Bay Area by the Diablo Range of low mountains with its Altamont Pass.

Santa Cruz County, California

Santa CruzSanta Cruz CountySanta Cruz Counties
Other sources may exclude parts of or even entire counties, or expand the definition to include neighboring counties that do not border the bay such as San Benito, San Joaquin, and Santa Cruz.
The county is on the California Central Coast, south of the San Francisco Bay Area region.

1906 San Francisco earthquake

1906 earthquakeSan Francisco earthquakeSan Francisco earthquake of 1906
A major earthquake leveled the city of San Francisco and environs in 1906, but the region quickly rebuilt in time to host the 1915 Panama-Pacific Exposition.
High intensity shaking was felt from Eureka on the North Coast to the Salinas Valley, an agricultural region to the south of the San Francisco Bay Area.

Association of Bay Area Governments

ABAG
Although the exact boundaries of the region vary depending on the source, the Bay Area is defined by the Association of Bay Area Governments to include the nine counties that border the aforementioned estuaries: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco.
The Association of Bay Area Governments (ABAG) is a regional planning agency incorporating various local governments in the San Francisco Bay Area in California.

East Bay

East Bay AreaEast Bay (San Francisco Bay Area)East Bay, California
Among locals, the nine-county Bay Area can be further divided into five sub-regions: the East Bay, North Bay, South Bay, Peninsula, and the city of San Francisco. The "East Bay" is the densest region of the Bay Area outside of San Francisco and includes cities and towns in Alameda and Contra Costa counties, centered around Oakland.
The East Bay is the eastern region of the San Francisco Bay Area and includes cities along the eastern shores of the San Francisco Bay and San Pablo Bay.

San Francisco

San Francisco, CaliforniaSan Francisco, CACity and County of San Francisco
Although the exact boundaries of the region vary depending on the source, the Bay Area is defined by the Association of Bay Area Governments to include the nine counties that border the aforementioned estuaries: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco. Among locals, the nine-county Bay Area can be further divided into five sub-regions: the East Bay, North Bay, South Bay, Peninsula, and the city of San Francisco.
It covers an area of about 46.89 sqmi, mostly at the north end of the San Francisco Peninsula in the San Francisco Bay Area, making it the second most densely populated large U.S. city, and the fifth-most densely populated U.S. county, behind only four of the five New York City boroughs.

Oakland, California

OaklandOakland, CACity of Oakland
The "East Bay" is the densest region of the Bay Area outside of San Francisco and includes cities and towns in Alameda and Contra Costa counties, centered around Oakland.
A major West Coast port city, Oakland is the largest city in the East Bay region of the San Francisco Bay Area, the third largest city overall in the San Francisco Bay Area, the eighth most populated city in California, and the 45th largest city in the United States.

San Francisco Peninsula

PeninsulaThe Peninsulaa long peninsula
Among locals, the nine-county Bay Area can be further divided into five sub-regions: the East Bay, North Bay, South Bay, Peninsula, and the city of San Francisco.
The San Francisco Peninsula is a peninsula in the San Francisco Bay Area that separates San Francisco Bay from the Pacific Ocean.

Palo Alto, California

Palo AltoPalo Alto, CACity of Palo Alto
Roughly coinciding with the borders of San Mateo county, it also includes the northwestern Santa Clara county cities of Palo Alto, Mountain View, and Los Altos.
Palo Alto is a charter city located in the northwest corner of Santa Clara County, California, United States, in the San Francisco Bay Area.

Mendocino County, California

Mendocino CountyMendocinoMendocino Counties
For example, the Federal Communications Commission (FCC) which regulates broadcast, cable, and satellite transmissions, includes nearby Colusa, Lake and Mendocino counties in their "San Francisco-Oakland-San Jose" media market, but excludes eastern Solano county.
It is located approximately equidistant from the San Francisco Bay Area and California/Oregon border, separated from the Sacramento Valley to the east by the California Coast Ranges.

Silicon Valley

Silicon Valley, CaliforniaSan JoseSan Francisco Bay Area technology industry
It is roughly synonymous with Silicon Valley due to its high concentration of tech companies, although the industry also has a significant presence in the rest of the Bay Area.
Silicon Valley is a region in the southern part of the San Francisco Bay Area in Northern California that serves as a global center for high technology, innovation, and social media.

North Bay (San Francisco Bay Area)

North BayNorth San Francisco Bay AreaNorth Bay Area
Among locals, the nine-county Bay Area can be further divided into five sub-regions: the East Bay, North Bay, South Bay, Peninsula, and the city of San Francisco.
The North Bay is a subregion of the San Francisco Bay Area, in California, United States.

San Jose, California

San JoseSan Jose, CASan José
The "South Bay" includes all of the rest of the cities in Santa Clara county, centered around San Jose, the largest city in Northern California.
It is also the most populous city in both the San Francisco Bay Area and the San Jose-San Francisco-Oakland Combined Statistical Area, which contain 7.7 million and 8.7 million people respectively.

Vallejo, California

VallejoVallejo, CAVallejo, Calif.
Sonoma and Napa counties are known internationally for their grape vineyards and wineries, and Solano county to the east, centered around Vallejo, is the fastest growing region in the Bay Area.
Vallejo is a waterfront city in Solano County, California, located in the North Bay subregion of the San Francisco Bay Area.

San Benito County, California

San BenitoSan Benito CountySan Benito Counties
Other sources may exclude parts of or even entire counties, or expand the definition to include neighboring counties that do not border the bay such as San Benito, San Joaquin, and Santa Cruz.
Sharing a border with Santa Clara County, San Benito County lies adjacent to the San Francisco Bay Area and is sometimes considered a part of that region.

Los Altos, California

Los AltosLos Altos, CALos Altos, United States
Roughly coinciding with the borders of San Mateo county, it also includes the northwestern Santa Clara county cities of Palo Alto, Mountain View, and Los Altos.
Los Altos is a city in Santa Clara County, California, in northern Silicon Valley, in the San Francisco Bay Area.