San Francisco Bay Area

Bay AreaSan FranciscoSan Francisco Baythe Bay AreaSan Francisco Bay Area, CaliforniaSF Bay AreaareaBayBay Area of CaliforniaSan Francisco 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 estuaries in the northern part of the U.S. state of California.wikipedia
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Northern California

Northernnorthern portionNorth California
The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo and Suisun estuaries in the northern part of the U.S. state of 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).

San Francisco Bay

BaySan Franciscothe Bay
The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo and Suisun estuaries in the northern part of the U.S. state of 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.

California

CAState of CaliforniaCalifornia, USA
The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo and Suisun estuaries in the northern part of the U.S. state of California. The larger combined statistical area of the region, which includes twelve 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 8.75 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 8.8 million residents respectively.

Marin County, California

Marin CountyMarinMarin Counties
Although the exact boundaries of the region vary depending on the source, the Bay Area is generally accepted 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.

Sonoma County, California

SonomaSonoma CountySonoma Counties
Although the exact boundaries of the region vary depending on the source, the Bay Area is generally accepted 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 Mateo County, California

San Mateo CountySan MateoSan Mateo Counties
Although the exact boundaries of the region vary depending on the source, the Bay Area is generally accepted 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-Hayward, Calif. Metropolitan Statistical Area, and is part of the San Francisco Bay Area, the nine counties bordering San Francisco Bay.

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 estuaries in the northern part of the U.S. state of 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.

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

Combined Statistical AreaSan Jose-San Francisco-OaklandSan Jose-Sunnyvale-Santa Clara
The larger combined statistical area of the region, which includes twelve 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 8.75 million people.
The San Jose–San Francisco–Oakland, CA Combined Statistical Area is a 12-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.

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 generally accepted 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, and is one of the most affluent counties in the United States.

San Joaquin County, California

San JoaquinSan Joaquin CountySan Joaquin Counties
Other sources may exclude parts of or even entire counties, or expand the definition to include neighboring counties that don't 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 don't 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 earthquake1906 earthquake and fire
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.
The 1906 San Francisco earthquake struck the coast of Northern California at 5:12 a.m. on Wednesday, April 18 with an estimated moment magnitude of 7.9 and a maximum Mercalli intensity of XI (Extreme). 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.

East Bay (San Francisco Bay Area)

East BayEast Bay AreaEast Bay region
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 eastern region of the San Francisco Bay Area, commonly referred to as the East Bay, 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 generally accepted 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 US city, and the fifth-most densely populated U.S. county, behind only four of the five New York City boroughs.

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 north of the San Francisco Bay Area and west of the Central Valley.

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, CAMayfield
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.

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.

Silicon Valley

Silicon Valley, CaliforniaSan JoseValley
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 San Francisco Bay Area of Northern California that serves as a global center for high technology, innovation and social media.

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.
San Jose is 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 don't 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.

Metropolitan Transportation Commission (San Francisco Bay Area)

Metropolitan Transportation CommissionMTCBay Area's Metropolitan Transportation Commission
Today, this definition is accepted by most local governmental agencies including San Francisco Regional Water Quality Control Board, Bay Area Air Quality Management District, the San Francisco Bay Restoration Authority, the Metropolitan Transportation Commission, and the Association of Bay Area Governments, the latter two of which partner to deliver a Bay Area Census using the nine-county definition.
The Metropolitan Transportation Commission (MTC) is the government agency responsible for regional transportation planning and financing in the San Francisco Bay Area.

Los Altos, California

Los AltosLos Altos, United StatesPasatiempo, California
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.