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The San Francisco Bay Area (popularly referred to as the Bay Area) is a populous region surrounding the San Francisco, San Pablo and in the northern part of the state of . 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 the consolidated City and County of . Other sources may exclude parts of or even entire counties, or include neighboring counties such as San Benito, San Joaquin, Stanislaus, and Santa Cruz.

Home to approximately 7.68 million people, Northern California’s nine-county Bay Area contains many cities, towns, airports, and associated regional, state, and , connected by a complex multimodal transportation network. The larger combined statistical area of the region, which includes twelve counties, is the second-largest in (after the Greater Los Angeles area), the fifth-largest in the , and the 41st-largest urban area in the world with 8.75 million people. The Bay Area's population is ethnically diverse: for example, roughly half of the region's residents are Hispanic, , , or Pacific Islander, all of whom have a significant presence throughout the region.

The earliest archaeological evidence of human settlements in the Bay Area dates back to 3000 BC. In 1769, the Bay Area was inhabited by the people when a Spanish exploration party led by Gaspar de Portolà entered the Bay – the first documented European visit to the Bay Area. After established independence from in 1821, the region was briefly controlled by the Mexican government until the seized the territory in 1846 during the Mexican–American War. Soon after, discovery of gold in California attracted a flood of treasure seekers, many using ports in the Bay Area as an entry point. During the early years of California's statehood, state legislative business rotated between three locations in the Bay Area before a permanent state capital was established in Sacramento. 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. During World War II, the Bay Area played a major role in America's war effort in the Asiatic-Pacific Theater, with San Francisco's acting as a primary embarkation point for American forces. In 1945, the United Nations Charter was signed in San Francisco, establishing the , and in 1951, the Treaty of San Francisco officially ended the U.S.'s . Since then, the Bay Area has experienced numerous political, cultural and artistic movements, developing unique local genres in music and art and establishing itself as a hotbed of . Economically, the post-war Bay Area saw huge growth in the financial and technology industries, creating a vibrant and diverse economy with a gross domestic product of over $700 billion, and home to the second highest concentration of Fortune 500 companies in the United States.

Despite its urban character, the San Francisco Bay is one of California's most ecologically important habitats, providing key ecosystem services such as filtering pollutants and sediments from the rivers, and supporting a number of endangered species. The region is also known for the complexity of its landforms, the result of millions of years of movements. Because the Bay Area is crossed by six major , the region is particularly exposed to hazards presented by large earthquakes. The climate is temperate and generally very mild, and is ideal for outdoor recreational and athletic activities such as hiking. The Bay Area is host to seven professional sports teams and is a cultural center for music, theater, and the arts. It is also host to several institutions of higher education, ranging from to major research universities. Home to 101 municipalities and nine counties, governance in the Bay Area is multifaceted and involves numerous local and regional actors, each with wide-ranging and overlapping responsibilities.


Boundaries

The borders of the San Francisco Bay Area are not officially delineated, and the unique development patterns influenced by the region's topography, along with the presence of unusual commute patterns caused by the presence of three central cities and employment centers located in suburban cities, has led to considerable disagreement between local and federal definitions of the area. Because of this, professor of at the University of California, Berkeley Richard Walker claimed that "no other U.S. city-region is as definitionally challenged as."

Locally, many of the regional governmental agencies and districts recognize the nine counties that border the San Francisco, San Pablo, and as part of the Bay Area: Alameda, Contra Costa, Marin, Napa, , San Mateo, Santa Clara, Solano, and Sonoma counties. These agencies include the 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.

Various U.S. Federal government agencies use definitions that differ from their local counterparts' nine-county definition. 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. On the other hand, the United States Office of Management and Budget, which designates Metropolitan Statistical Areas (MSAs) and Combined Statistical Areas (CSA) for populated regions across the country, has five MSAs which include, wholly or partially, areas within the nine-county definition, and one CSA which includes all nine counties plus neighboring San Benito, Santa Cruz and San Joaquin counties.


Subregions
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. Although geographically located on the tip of the San Francisco Peninsula, the city of San Francisco is not considered part of the "Peninsula" subregion, but as a separate entity.
(2006). 9780912301631, First Books. .

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. As one of the larger subregions, the East Bay includes a variety of enclaves, including the suburban area and the highly urban western part of the subregion that runs alongside the bay.

(2006). 9780912301631, First Books. .
The "Peninsula" subregion includes the cities and towns on the San Francisco Peninsula, excluding the titular city of San Francisco. Its eastern half, which runs alongside the Bay, is highly populated while its less populated western coast traces the coastline of the and is known for its open space and hiking trails. 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.
(2006). 9780912301631, First Books. .
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 roughly synonymous with due to its high concentration of tech companies, although the industry also has a significant presence in the rest of the Bay Area.
(2006). 9780912301631, First Books. .
The "North Bay" includes Marin, Sonoma, Napa, and Solano counties, and is the largest and least populated subregion. The western counties of Marin and Sonoma are encased by the Pacific Ocean on the west and the bay on the east, and are characterized by its mountainous and woody terrain. Sonoma and Napa counties are known internationally for their grape vineyards and , and Solano county to the east, centered around Vallejo, is the fastest growing region in the Bay Area.
(2006). 9780912301631, First Books. .


History

Although the settlement of the Americas occurred some 20,000 years ago, when the first Asians crossed the into , the earliest archaeological evidence of human habitation of the Bay Area dates to around 3,000 along the shores of the bay, with evidence pointing to even earlier settlement in in Marin County. The and people, who were living in the Bay Area at the time of first European contact, were possibly descended from tribes who arrived at around 1,000 BC by sailing over the and following the salmon migration. The Ohlone lived in about forty or so tribes spread throughout the lands adjacent to the San Francisco Bay and as far south as near .

In 1575, a Spanish exploration party led by Sebastian Rodriguez Cermeno landed in near Point Reyes and was the first European settler to claim land in the Bay Area. He was soon followed in 1579 by Sir Francis Drake, who also landed in Drakes Bay and claimed the land for England. The San Francisco Bay itself remained undiscovered by Europeans until a Spanish expedition led by Gaspar de Portolà sailed through the Golden Gate Strait in 1769. Further expeditions by Spanish explorers in the following years include those led by Juan Bautista de Anza who colonized the , and who started at the Presidio and led expedition parties to San Jose and over the , as well as reaching the San Joaquin Valley. In 1821, gained its independence from and the Bay Area became part of the Mexican province of , a period characterized by ranch life and visiting trappers. Mexico's control of the territory would be short-lived, however, and in 1846, a party of settlers occupied and proclaimed the independence of the new Republic of California. That same year, the Mexican-American War began, and American captain John Berrien Montgomery sailed the into the bay and seized San Francisco, which was then known as Yerba Buena, and raised the for the first time over Portsmouth Square.

(2001). 9780762710768, Globe Pequot. .

In 1848, James W. Marshall's discovery of gold in the sparked the California Gold Rush, and within half a year, 4,000 men were panning for gold along the river and finding $50,000 per day. The promise of fabulous riches quickly led to a stampede of wealth-seekers descending on Sutter's Mill. The Bay Area's population quickly emptied out as laborers, clerks, waiters, and servants joined the rush to find gold, and California's first newspaper, The Californian, was forced to announce a temporary freeze in new issues due to labor shortages. By the end of 1849, news had spread across the world and newcomers flooded into the Bay Area at a rate of one thousand per week on their way to California's interior, including the first large influx of Chinese immigrants to the U.S.
(2018). 9781598842197, ABC-CLIO.
The rush was so great that vessels were abandoned by the hundreds in San Francisco's ports as crews rushed to the gold fields. The unprecedented influx of new arrivals spread the nascent government authorities thin, and the military was unable to prevent desertions. As a result, numerous vigilante groups formed to provide order, but many tasked themselves with forcibly moving or killing local Native Americans, and by the end of the Gold Rush, two thirds of the indigenous population had been killed.

During this same time, a constitutional convention was called to determine California's application for statehood into the . After statehood was granted, the capital city moved between three cities in the Bay Area: San Jose (1849–1851), Vallejo (1851–1852), and Benicia (1852–1853) before permanently settling in Sacramento in 1854. As the Gold Rush wound down, wealth generated from the endeavor led to the establishment of Wells Fargo Bank and the Bank of California, and immigrant laborers attracted by the promise of wealth transformed the demographic makeup of the region. Construction of the First Transcontinental Railroad from the Oakland Long Wharf attracted so many laborers from China that by 1870, eight percent of San Francisco's population was of Asian origin. The completion of the railroad connected the Bay Area with the rest of the United States, established a truly national marketplace for the trade of goods, and accelerated the urbanization of the region.

In the early morning of April 18, 1906, a large earthquake with an epicenter near the city of San Francisco hit the region. Immediate casualty estimates by the U.S. Army's relief operations were 498 deaths in San Francisco, 64 deaths in Santa Rosa, and 102 in or near San Jose, for a total of about 700. More recent studies estimate the total death count to be over 3,000, with over 28,000 buildings destroyed. Rebuilding efforts began immediately. Amadeo Peter Giannini, owner of the Bank of Italy (now known as the Bank of America), had managed to retrieve the money from his bank's vaults before fires broke out through the city and was the only bank with funds readily available and was instrumental in loaning out funds for rebuilding efforts. Congress immediately approved plans for a reservoir in Hetch Hetchy Valley in Yosemite National Park, a plan they had denied a few years earlier, which now provides drinking water for 2.4 million people in the Bay Area. By 1915, the city had been sufficiently rebuilt and advertised itself to the world during the Panama Pacific Exposition that year, although the effects of the quake hastened the loss of the region's dominant status in California to the Los Angeles metropolitan area.

During the 1929 stock market crash and subsequent , not a single San Francisco-based bank failed, while the region attempted to spur job growth by simultaneously undertaking two large infrastructure projects: construction of the Golden Gate Bridge, which would connect San Francisco with Marin County, and the Bay Bridge, which would connect San Francisco with Oakland and the East Bay. After the United States joined World War II in 1941, the Bay Area became a major domestic military and naval hub, with large shipyards constructed in Sausalito and across the East Bay to build ships for the war effort, and acting the primary port of embarkation for service members shipping out to the Pacific Theater of Operations. After the war, the was chartered in San Francisco to help prevent the kind of devastation that occurred over the past decade, and on September 1951, Japan officially surrendered to the Allied forces in San Francisco, with the Treaty of San Francisco entering into force a year later. In the years immediately following the war, the Bay Area saw a huge wave of immigration as populations increased across the region. Between 1950 and 1960, San Francisco welcomed over 100,000 new residents, inland suburbs in the East Bay saw their populations double, Daly City's population quadrupled, and Santa Clara's population quintupled.

By the early 1960s, the Bay Area and the rest of Northern California became the center of the counterculture movement. in Berkeley and the neighborhood in San Francisco were seen as centers of activity, with the hit American San Francisco (Be Sure to Wear Flowers in Your Hair) further enticing like-minded individuals to join the movement in the Bay Area and leading to the Summer of Love. In the proceeding decades, the Bay Area would cement itself as a hotbed of activism, , opposition to the Vietnam War and other anti-war movements, the , and the gay rights movement. At the same time, San Jose and the rest of the South Bay began to rapidly develop as it began to transition from a largely agricultural-based economy into the hotbed of the high-tech industry. , the director of a top-secret research project at Harvard University during World War II, joined the faculty at Stanford University in order to reshape the university's engineering department. His students, including and William Hewlett would later help usher in the region's high-tech revolution. In 1955, Shockley Semiconductor Laboratory opened for business near Stanford, and although the business venture was a financial failure, it was the first company in the Bay Area, and the talent that it attracted to the region eventually led to a high-tech cluster of companies later known as .

In 1989, in the middle of the World Series match between two Bay Area baseball teams, the Loma Prieta earthquake struck and caused widespread infrastructural damage, including the failure of the Bay Bridge, a major link between San Francisco and Oakland. Even so, the Bay Area's technology industry continued to expand and growth in Silicon Valley accelerated that the United States Census confirmed that year that San Jose had overtaken San Francisco in terms of population. The commercialization of the in the middle of the decade rapidly created a speculative bubble in the high-tech economy known as the . This bubble began collapsing in the early 2000s and the industry continued contracting for the next few years, nearly wiping out the market. Companies like Amazon.com and managed to weather the crash however, and following the industry's return to normalcy, their market value increased significantly.

Even as the growth of the technology sector transformed the region's economy, continued to guide the region's political environment. By the turn of the millennium, Non-Hispanic whites, the largest ethnic group in the United States, were only half of the population in the Bay Area as immigration among minority groups accelerated. During this time, the Bay Area was the center of the LGBT rights movement: in 2004, San Francisco began issuing marriage licenses to same-sex couples, a first in the United States, and four years later, a majority of voters in the Bay Area rejected California Proposition 8, which sought to constitutionally restrict marriage to opposite-sex couples but ultimately passed statewide. The Bay Area was also the center of contentious protests concerning racial and economic inequality. In 2009, an man named Oscar Grant was fatally shot by , precipitating widespread protests across the region and even riots in Oakland, and whose name was symbolically tied to the protests two years later that sought to fight against social and economic inequality. Following the Inauguration of Donald Trump as President of the United States in 2017, the Bay Area became a center of resistance to his administration, beginning with widespread protests in concert with the nationwide Women's March a day later, followed by frequent public feuds between Trump and various Bay Area political, cultural, and business figures over issues of race and immigration, among others.


Culture

Arts

Art

The Bay Area was a hub of the Abstract Expressionism movement of painting. It is associated with the works of , who began teaching at the California School of Fine Arts (now the San Francisco Art Institute) in 1946, leaving a lasting impact on the artistic styles of Bay Area painters up to the present day. A few years later, Abstract Expressionist painter David Park painted Kids on Bikes in 1950, which retained many aspects of abstract expressionism but with original distinguishing features that would later lead to the Bay Area Figurative Movement. While both the Figurative Movement and the Abstract Expressionism movement arose from art schools, would later rise out of the region's underground and was characterized by informal sharing of technique among groups of friends and art showcases in "cooperative" galleries instead of formal museums. Later, the Bay Area art movement would be heavily influenced by the counterculture movement in the 1960s, and art produced during this time reflected the political environment.

The Bay Area is presently home to a thriving computer animation industry led by Pixar Animation Studios and Industrial Light & Magic. Pixar, based in Emeryville, produced the first fully computer animated feature film, , with software it designed in-house and whose computer animation films have since garnered 26 and critical acclaim. Industrial Light & Magic, which is based in the Presidio in San Francisco, was created in 1975 to help create visual effects for the series has since been involved with creating visual effects for over three hundred Hollywood films.


Music
Throughout its recent history, the Bay Area has been home to several musical movements that left lasting influences on the genres they affected. San Francisco, in particular, was the center of the counterculture movement in the 1960s, which directly led to the rise of several notable musical acts: , which formed in 1965, and Jefferson Airplane and ; all three would be closely associated with the 1967 Summer of Love.T. Gitlin, The Sixties: Years of Hope, Days of Rage, (New York, 1993), p.215–217 also had strong connections to the movement and the Bay Area, as he lived in Berkeley for a brief time as a child and played in many local venues in that decade. By the 1970s, San Francisco had developed a vibrant jazz scene, earning the moniker, "Harlem of the West". The was being fought at the time, and Bay Area bands such as Creedence Clearwater Revival of El Cerrito became known for their political and socially-conscious lyrics against the conflict. rose to fame in the early 1970s with his and would later be inducted into the Rock and Roll Hall of Fame, "Santana". Rock and Roll Hall of Fame. Retrieved April 16, 2013. and would later help lead the formation of the band Journey along with former members of Santana.

During the 1980s and early 1990s, the Bay Area became home to one of the largest and most influential scenes in the world, with contributions from 3 of the "Big Four" of thrash metal, namely , , and , and the emergence of the avant-garde metal with bands such as Giant Squid, , and .; The era in the 1990s and featured prominent Bay Area bands Third Eye Blind of San Francisco, of Berkeley, and of San Jose, and later bands like . The 1990s also saw the emergence of the influential in , derived from the Oakland for "hyperactive", and pioneered by Bay Area rappers Andre "Mac Dre" Hicks, , and E-40. Other notable rappers from the Bay Area include , , and . Today, much of the rap coming out of the Oakland and the East Bay is "", which concerns itself with social issues and awareness.

The Bay Area is also home to hundreds of ensembles, from community choirs to professional , such as the San Francisco Symphony, California Symphony, Fremont Symphony Orchestra, and the San Francisco Chamber Orchestra.


Theater

According to the regional theater service organization Theatre Bay Area, the San Francisco Bay Area is the third largest center of activity for and in the United States, after the New York City and Chicago metropolitan areas, with 400 companies spread throughout the region. The organization was founded in 1976 by the and American Conservatory Theater (ACT) in San Francisco and the Berkeley Repertory Theatre in Berkeley. The latter two, along with the San Francisco Mime Troupe, have since gone on to win one Regional Theatre Tony Award each. Several famous actors have arisen from the Bay Area's theatre community, including from Hamilton and from Hedwig, A Very Potter Musical, and Glee. Locally, well-regarded actors include James Carpenter, a stage actor who has performed at the ACT, Berkeley Repertory, and San Jose Repertory Theatre among others, Rod Gnapp of the Magic Theatre Company, Sean San Jose, one of the founders of the Campo Santo theater, and Campo Santo member Margo Hall.

The Bay Area also has an active youth theater scene. ACT and the Berkeley Repertory both run classes and camps for young actors, as do the Peninsula Youth Theater and Willow Glen Children’s Theatre in the Peninsula and South Bay, Bay Area Children's Theater and Danville Children’s Musical Theater in the East Bay, and Marin Shakespeare in the North Bay, among many others.


Media
The San Francisco Bay Area is the sixth-largest television market and the fourth-largest radio market in the U.S. The Bay Area's oldest radio station, KCBS (AM), began as an experimental station in San Jose in 1909, before the beginning of commercial broadcasting. was the Bay Area's first , and first radio station to begin commercial broadcasting west of the Mississippi River when it signed on the air in 1941. , which began broadcasting in 1948, was the first television station to air in the Bay Area and Northern California.

All major U.S. television networks have affiliates serving the region, including 2 (FOX), 4 (Local News/), 5 (CBS), 7 (ABC), 9 (PBS), 11 (NBC), KBCW 44/45 (CW), 54 (PBS), and 65 (). , a show that focuses on topics pertaining to technology and business, was launched in 2011 from a studio in and continues to broadcast from San Francisco.

Public broadcasting outlets include both a and a , both broadcasting under the call letters KQED from a facility near the Potrero Hill neighborhood. KQED-FM is the most-listened-to National Public Radio affiliate in the country. Another local broadcaster, , is an independent, African-American owned and operated noncommercial radio station established in 1971.

The largest newspapers in the Bay Area are the San Francisco Chronicle and San Jose Mercury News, the highest and second-highest most widely circulated newspaper in Northern California. The Chronicle is most famous for a former columnist, the late , whose daily musings attracted critical acclaim and represented the "voice of San Francisco". The San Francisco Examiner, once the cornerstone of William Randolph Hearst's media empire and the home of , declined in circulation over the years and now takes the form of a free daily tabloid, under new ownership. Most of the Bay Area's local regions and municipalities also have their own newspapers, such as the East Bay Times and San Mateo Daily Journal. The national newsmagazine Mother Jones is also based in San Francisco. Non-English language newspapers include several Chinese-language papers such as Sing Tao Daily, the largest in the Bay Area by circulation, and El Mundo, a free Spanish-language weekly distributed by the Mercury News.


Sports and recreation

The Bay Area is home to seven professional major league sports franchises: The San Francisco 49ers and of the National Football League (NFL) in American football, the San Francisco Giants and Oakland Athletics of Major League Baseball (MLB), the Golden State Warriors of the National Basketball Association (NBA), the San Jose Sharks of the National Hockey League, and the San Jose Earthquakes of Major League Soccer. In , the Bay Area was host to the 2013 America's Cup.

In American football, the 49ers play in Levi's Stadium and have won five (XVI, XIX, XXIII, XXIV, XXIX) and lost one (XLVII), while the Raiders play in Oakland–Alameda County Coliseum until their relocation to in either 2019 or 2020 and have won three Super Bowls (XI, XV, XVIII), and lost two (II, XXXVII) In baseball, the San Francisco Giants, who play at AT&T Park, have won eight titles, and the Oakland Athletics, who share the Oakland Coliseum with the Raiders, have won nine World Series titles. In , the Warriors play in and have won three since their move to Oakland in 1971. In , the Sharks play at the and have yet to win the despite making their first Stanley Cup Finals appearance in 2016. In soccer, the Earthquakes play at and have won the twice in 2001 and 2003.

Outside of major league sports, the Bay Area is home to seven minor league teams: one soccer team (San Francisco Deltas), one hockey team (San Jose Barracuda), one Minor League Baseball team (San Jose Giants) in the California League, and four baseball teams in the Pacific Association of Professional Baseball Clubs (San Rafael Pacifics, , Pittsburg Diamonds, and the ). In terms of collegiate sports, six Bay Area universities are members of NCAA Division I, the highest level of college sports in the country. All three football-playing schools in the Bay Area are in the Football Bowl Subdivision, the highest level of NCAA . The California Golden Bears and Stanford Cardinal compete in the Pac-12 Conference, and the San Jose State Spartans compete in the Mountain West Conference. The Cardinal and Golden Bears are intense rivals, with their football teams competing annually in the Big Game for the Stanford Axe. One of the most famous games in the rivalry occurred in 1982, when the Golden Bears defeated the Cardinal on a last-second return kickoff known as "The Play".

The Bay Area has an ideal climate for outdoor recreation, such that activities like hiking and cycling are popular among locals. There are more than of bicycle paths, lanes and bike routes just within San Francisco, and the Embarcadero and are favored sites for . Extensive public tennis facilities are available in Golden Gate Park and , as well as at smaller neighborhood courts throughout the city. San Francisco residents have often ranked among the fittest in the U.S. Boating, sailing, and are among the popular activities on San Francisco Bay, and the city maintains a yacht harbor in the Marina District. The St. Francis Yacht Club and Golden Gate Yacht Club are located in the Marina Harbor, while the South Beach Yacht Club is located next to AT&T Park.


Demographics

According to the 2010 United States Census, the population of the nine-county Bay Area was 7.15 million, with 49.6% male and 50.4% female. Of these, approximately 2.3 million (32%) are foreign born. In 2010 the racial makeup of the nine-county Bay Area was 52.5% of which 42.4% were non-Hispanic and 10.1% were Hispanic, 23.5% Hispanic or Latino of any race (17.9% Mexican, 1.3% Salvadoran, 0.6% Guatemalan, 0.6% Puerto Rican, 0.5% Nicaraguan, 0.3% Peruvian, 0.2% Cuban), 23.3% (7.9% Chinese, 5.1% Filipino, 3.3% Indian, 2.5% Vietnamese, 1.0% Korean, 0.9% Japanese, 0.2% Pakistani, 0.2% Cambodian, 0.2% Laotian, 0.1% Thai, 0.1% Burmese), 6.7% non-Hispanic African American, 0.7% Native American or , 0.6% Pacific Islander (0.1% Tongan, 0.1% Samoan, 0.1% Fijian, >0.1% Guamanian, >0.1% Native Hawaiian), 5.4% from two or more races and 10.8% from other races. The Bay Area cities of Vallejo, Suisun City, Oakland, San Leandro, Fairfield, and Richmond are among the most ethnically diverse cities in the United States.

Based on geographic location, non-Hispanic whites make up the majority in Marin, Napa, and Sonoma counties. Whites also make up the majority in the eastern regions of the East Bay centered around Livermore and Walnut Creek areas. San Francisco's North Beach district is considered the of the city, and was once home to a significant Italian American community. San Francisco and Marin County both have substantial communities. The population is spread throughout the Bay Area, but among the nine counties, the greatest number of them live in Santa Clara County, while Contra Costa County sees the highest growth rate. Mexican Americans make up the largest share of Hispanic residents in Napa county, while Central Americans make up the largest share in San Francisco, many of whom live in the Mission District which is home to many residents of Salvadoran and Guatemalan descent.

The population in the Bay Area is significant compared to other regions in the U.S., concentrated in the Bay Area city of Daly City. At 58.4%, Daly City's Asian American population is larger than anywhere else in the United States outside of . Asian Americans also constitute a majority in Fremont, with significant populations in Sunnyvale and Santa Clara. The cities of San Jose and San Francisco had the third and fourth largest total number of Asian Americans out of every American city. In , Chinese Americans constitute 21.4% of the population and constitute the single largest ethnic group in the city. Santa Clara county, and increasingly the East Bay, house a significant community. The Bay Area is home to over 382,950 Filipino Americans, one of the largest communities of Filipino people outside of the with the largest proportion of Filipino Americans concentrating themselves within , Daly City, Fairfield, South San Francisco and Vallejo. There are more than 100,000 people of Vietnamese ancestry residing within San Jose city limits, the largest Vietnamese population of any city in the world outside of . In addition, there is a sizable community of in Santa Clara county, where San Jose is located. East Bay cities such as Richmond and Oakland, and the North Bay city of Santa Rosa, have plentiful populations of Laotian and Cambodians in certain neighborhoods. Pacific Islanders such as and have the largest presence in East Palo Alto, where they constitute over 7% of the population.

The population of the Bay Area used to be significant in San Francisco, where one out of seven residents were black in 1970, which had a thriving scene and was known as "Harlem of the West". Today, they have mostly moved to parts of the East Bay and North Bay, including the cities of Oakland and Antioch. The South Park neighborhood of Santa Rosa was home to once a primarily black community until the 1980s, when many Latino immigrants settled in the area. Other cities with large numbers of African Americans include Vallejo (28%), Richmond (26%), and East Palo Alto (17%).

Since the economy of the Bay Area heavily relies on innovation and high-tech skills, a greater, educated population exists in the region. Roughly 87.4% of Bay Area residents have attained a high school degree or higher,Community Facts. (2010, October 5). United. Retrieved from factfinder.census.gov/faces/nav/jsf/pages/community_facts.xhtml#. while 46% of adults in the Bay Area have earned a post-secondary degree or higher. Scott, W. Richard, and Michael W. Krist. Higher Education and Silicon Valley: Connected but Conflicted. Johns Hopkins University Press, 2017.

The Bay Area is one of the wealthiest regions in the United States, due, primarily, to the economic power engines of San Jose, San Francisco, and Oakland. The Bay Area city of Pleasanton has the second-highest household income in the country after New Canaan, Connecticut. However, discretionary income is very comparable with the rest of the country, primarily because the higher cost of living offsets the increased income.

By 2014, the Bay Area's wealth gap was considerable: the top ten percent of income-earners took home over eleven times as much as the bottom ten percent, and a Brookings Institution study found the San Francisco metro area, which excludes four Bay Area counties, to be the third most unequal urban area in the country. Among the wealthy, there are forty-seven Bay Area residents made the magazine's 400 richest Americans list, published in 2007. Thirteen lived in San Francisco proper, placing it seventh among cities in the world. Among the forty-seven were several well-known names such as , , and Charles Schwab. The wealthiest resident was of Oracle, worth $25 billion. A study by indicates that in 2009, 4.5 percent of all households within the San Francisco-Oakland and San Jose metropolitan areas held $1 million in investable assets, placing the region first in the United States, just ahead of the New York City metro region. On the other hand, low income residents in the Bay Area saw their incomes fall by nine percent since 2007, with the bottom ten percent earning just $20,000 on average.

22.2%
23.9%
14.0%
31.5%
15.1%
24.9%
26.6%
23.6%
24.3%

$87,012
$93,437
$113,826
$79,884
$87,329
$104,370
$103,255
$79,316
$78,227


Crime
Statistics regarding crime rates in the Bay Area generally fall into two categories: and . Historically, violent crime has been concentrated in a few cities in the East Bay, namely Oakland, Richmond, and Antioch, but also East Palo Alto in the Peninsula, Vallejo in the North Bay, and . Nationally, Oakland's murder rate ranked 18th among cities with over 100,000 residents, and third for violent crimes per capita. According to a 2015 Federal Bureau of Investigation report, Oakland was also the source of the most violent crime in the Bay Area, with 16.9 reported incidents per thousand people. Vallejo came in second, at 8.7 incidents per thousand people, while San Pablo, Antioch, and San Francisco rounded out the top five. East Palo Alto, which used to have the Bay Area's highest murder rate, saw violent crime incidents drop 65% between 2013 and 2014, while Oakland saw violent crime incidents drop 15%. Meanwhile, San Jose, which was one of the safest large cities in the United States in the early 2000s, has seen its violent crime rates trend upwards. Cities with the lowest rate of violent crime include the Peninsula cities of Los Altos and Foster City, East Bay cities of San Ramon and Danville, and South Bay cities of Saratoga and Cupertino. In 2015, 45 Bay Area cities counted zero homicides, the largest of which was Daly City.

In 2015, Oakland also saw the highest rates of property crime in the Bay Area, at 59.4 incidents per thousand residents, with San Francisco following close behind at 53 incidents per thousand residents. The East Bay cities Pleasant Hill, Berkeley, and San Leandro rounded out the top five. The South Bay city of Saratoga and the North Bay city of Windsor saw the least rates of property crime. Additionally, San Francisco saw the most reports of arson.

Several street gangs operate in the Bay Area, including the Sureños and Norteños in San Francisco's Mission District. African-American street gangs familiar in other cities, including the , have struggled to establish footholds in the city, although gangs with shotcallers in China, including Triad groups such as the Wo Hop To, have been reported active. In 1977, an ongoing rivalry between two Chinese gangs led to a shooting attack at the Golden Dragon restaurant in Chinatown, which left five people dead and eleven wounded. Five members of the gang were arrested and convicted of the crime. Oakland, which also sees organized gang violence, implemented Operation Ceasefire in 2012 in an effort to reduce the violence.


Economy
The three principal cities of the Bay Area represent different employment clusters and are dominated by different, but commingled, industries. San Francisco is home to the region's financial and business industry, tourism, and is host to numerous conventions. The East Bay, centered around Oakland, is home to heavy industry, metalworking, oil, and shipping, while Silicon Valley is a major pole of economic activity around the industry. Furthermore, the North Bay is a major player in the country's and wine industry. In all, the Bay Area is home to the second highest concentration of Fortune 500 companies, second only to the New York metropolitan area, with thirty such companies based throughout the region. In 2016, the greater twelve-county statistical area had a GDP of $820.9 billion, the third-highest among combined statistical areas. The smaller nine-county Bay Area had a GDP of $781 billion, which nonetheless would rank it 5th among U.S. states and 18th among countries.

Several major corporations are headquartered in the Bay Area. Among the Fortune 500 companies located in the region include technology companies , Apple Inc., , , Applied Materials, , , , Oracle, , and ; companies Chevron and PG&E; financial service companies Charles Schwab Corporation, Visa Inc., and ; retailers Gap Inc., Levi Strauss & Co., and ; and defense contractor ; local Safeway; pharmaceutical company McKesson; and biotechnology companies and . The largest manufacturers include Tesla Inc., , , Chevron, and . Oakland is the site of the fifth-largest container shipping port in the United States and is also a major . In research, 's Ames Research Center and the federal research facility Lawrence Livermore National Laboratory are based in Mountain View and Livermore respectively. In the North Bay, Napa and Sonoma counties are known for their famous wineries, including Fantesca Estate & Winery, Domaine Chandon California, and D'Agostini Winery.


Housing
The Bay Area is one of the most expensive places to live in the United States. Strong economic growth has created hundreds of thousands of new jobs, but coupled with severe restrictions on building new housing units, has resulted in an extreme housing shortage. For example, from 2012 to 2017, the San Francisco metropolitan area added 400,000 new jobs, but only 60,000 new housing units. As of 2016, the entire Bay Area had 3.6 M jobs, and 2.6 M housing units, for a ratio of 1.4 jobs per housing unit, significantly above the ratio for the US as a whole, which stands at 1.1 jobs per housing unit. (152M jobs, 136M housing units ) According to a survey conducted by the United States Census Bureau, the Bay Area ranks #1 "in median home value, median monthly costs for homes with a mortgage, and median gross rent." Bee, C. A. (2013). The Geographic Concentration of High-Income Households: 2007-2011 (No. ACSBR/11-23). United States Census Bureau. Bay Area burden. electronic : examining the costs and impacts of housing and transportation on Bay Area residents, their neighborhoods and the environment. (2009). Washington, DC : Urban Land Institute, c2009. As of 2017, the average income needed in order to purchase a house in the region was $179,390, while the median price for a house was $895,000 and the average cost of a home in the Bay Area being $440,000 - more than twice the national average, while the average monthly rent is $1,240 - 50 percent more than the national average.Alamo, C., Uhler, B., & O'Malley, M. (2015). California's high housing costs : causes and consequences. Sacramento, CA : Legislative Analyst's Office, March 17, 2015..

With high costs of living, many Bay Area residents allocate large amounts of their income towards housing. 20 percent of Bay Area homeowners spend more than half their income on housing, while roughly 25 percent of renters in the Bay Area spend more than half of their incomes in the Bay Area. Bay Area Burden. Electronic : Examining the Costs and Impacts of Housing and Transportation on Bay Area Residents, Their Neighborhoods and the Environment. Washington, DC : Urban Land Institute, c2009., 2009. EBSCO host Expending an average of more than $28,000 per year on housing in addition to roughly $13,400 on transportation, Bay Area residents spend around $41,420 per year to live in the region. This combined total of housing and transportation signifies 59 percent of the Bay Area's median household income, conveying the extreme costs of living. The high rate of homelessness in the Bay Area can be attributed to the high cost of living.Quigley, J. M., Raphael, S., & Smolensky, E. (2001). Homelessness in California. San Francisco, Calif. : Public Policy Institute of California, 2001. No approximate number of homeless people living in the Bay Area can be determined due to the difficulty of tracking homeless residents. However, according to San Francisco’s Department of Public Health, the number of homeless people in San Francisco alone is 9,975.Suzuki, L. (2016, June 28). How Many People Live on Our Streets? San Francisco Chronicle. Retrieved from projects.sfchronicle.com/sf-homeless/numbers/. Additionally, San Francisco was revealed to have the most unsheltered homeless people in the country.

Because of the high cost of housing, many workers in the Bay Area live far from their place of employment, contributing to one of the highest percentages of extreme commuters in the United States, or commutes that take over ninety minutes in one direction. For example, about 50,000 people commute from neighboring San Joaquin county into the nine-county Bay Area daily, and more extremely, some workers commute daily by flying.


Education

Colleges and universities

The Bay Area is home to a large number of colleges and universities. The first institution of higher education in the Bay Area, Santa Clara University, was founded by in 1851, who also founded the University of San Francisco in 1855. San Jose State University was founded in 1857 and is the oldest public college on the West Coast of the United States. According to the Brookings Institution, 45% of residents of the two-county San Jose metro area have a college degree and 43% of residents in the five-county San Francisco metro area have a college degree, the second and fourth highest ranked metro areas in the country for higher educational attainment.

Rankings compiled by U.S. News & World Report feature several Bay Area universities in prominent spots. Stanford University is the highest ranked university in the Bay Area, and fifth overall in the United States. The University of California, Berkeley is ranked twentieth overall, but for the past nineteen years has been highest-ranked public university in the country. Additionally, San Jose State University and Sonoma State University were respectively ranked sixth and tenth among public colleges in the West Coast.

The city of San Francisco is host to two additional University of California schools, neither of which confer degrees. The University of California, San Francisco is entirely dedicated to graduate education in health and biomedical sciences. It is ranked among the top five medical schools in the United States and operates the UCSF Medical Center, which is the highest-ranked hospital in California. The University of California, Hastings College of the Law, founded in Civic Center in 1878, is the oldest law school in California and claims more judges on the state bench than any other institution. The city is also host to a California State University school, San Francisco State University.

California Community Colleges System also operates a number of community colleges in the Bay Area. According to , the Bay Area community college with the highest "success" rate is De Anza College in Cupertino, which is also the tenth-highest ranked in the nation. Other relatively well-ranked Bay Area community colleges include , City College of San Francisco, West Valley College, Diablo Valley College, and Las Positas College.

Many scholars have pointed out the overlap of education and the economy within the Bay Area. According to multiple reports, research universities such as Stanford University, University of California - Santa Cruz and University of California - Berkeley, are essential to the culture and economy in the area. Scott, W. Richard, and Michael W. Krist. Higher Education and Silicon Valley: Connected but Conflicted. Johns Hopkins University Press, 2017. These universities also provide countless, public programs for people to learn and enhance skills relevant to the local economies. These opportunities not only provide educational services to the community, but also generates significant amounts of revenue.


Primary and secondary schools
Public primary and secondary education in the Bay Area is provided through school districts organized through three structures: elementary school districts, high school districts, or unified school districts, and are governed by an elected board. In addition, many Bay Area counties and the city of San Francisco operate "special service schools" that are geared towards providing education to students with handicaps or . An alternative public educational setting is offered by , which may be established with a renewable charter of up to five years by third parties. The mechanism for charter schools in the Bay Area is governed by the California Charter Schools Act of 1992.

According to rankings compiled by U.S. News & World Report, the highest-ranked high school in California is the Pacific Collegiate School, located in Santa Cruz and part of the greater Bay Area. Within the traditional nine-county boundaries, the highest ranked high school is KIPP San Jose Collegiate in San Jose. Among the top twenty high schools in California include Lowell High School in San Francisco, Monta Vista High School in , the University Preparatory Academy in San Jose, Mission San Jose High School in Fremont, Oakland Charter High School in Oakland, Henry M. Gunn High School in Palo Alto, and Saratoga High School in Saratoga.


Geography

Climate
The Bay Area is located in the relatively rare warm-summer Mediterranean climate zone (Köppen Csb) that is a characteristic of California's coast, with moist mild winters and dry summers. It is largely influenced by the cold California Current, which penetrates the natural mountainous barrier along the coast by traveling through various gaps. In terms of , this means that the Bay Area has pronounced wet and dry seasons. The wet season, which roughly runs between November and March, is the source of about 82% of annual precipitation in the area. In the South Bay and further inland, while the wet season is cool and mild, the summer dry season is characterized by warm sunny days, while in San Francisco and areas closer to the Golden Gate strait, the dry season is periodically affected by fog.

Due to the Bay Area's diverse topography, the result of the clashing , the region is home to numerous that lead to pronounced differences in climate and temperature over short distances. Within the city of San Francisco, natural and artificial topographical features direct the movement of wind and fog, resulting in startlingly varied climates between city blocks. Along the Golden Gate Strait, oceanic wind and fog from the are able to penetrate the mountain barriers inland into the Bay Area. During the summer, rising hot air in California's interior valleys creates a low pressure area that draws winds from the North Pacific High through the Golden Gate, which creates the city's characteristic cool winds and fog. The microclimate phenomenon is most pronounced during this time, when fog penetration is at its maximum in areas near the Golden Gate strait, while the South Bay and areas further inland are sunny and dry.

Along the San Francisco peninsula, gaps in the Santa Cruz Mountains, one south of San Bruno Mountain and another in Crystal Springs, allow oceanic weather into the interior and causing a cooling effect for cities along the Peninsula and even as far south as San Jose. This weather pattern is also the source for delays at San Francisco International Airport. In Marin county north of the Golden Gate strait, two gaps north of Muir Woods bring cold air across the , with the cooling affect reaching as far north as Santa Rosa. Further inland, the East Bay receives oceanic weather that travels through the Golden Gate strait, and further diffuses that air through the , and the Hayward Pass into the and . Here, the resulting breeze is so strong that it is home to one of the world's largest array of . Further north, the funnels the ocean weather into the San Joaquin River Delta, causing a cooling effect in Stockton and Sacramento, so that these cities are also cooler than their Central Valley counterparts in the south.

+ daily high and low temperatures in °F (°C) for selected locations in the Bay Area,
colored and sortable by average monthly temperature

! Santa Rosa


Ecology

Marine wildlife
The Bay Area is home to a diverse array of wildlife and, along with the connected San Joaquin River Delta represents one of California's most important ecological habitats. California's , Pacific , and the California are all significant components of the bay's . The bay's now represent most of California's remaining salt marsh and support a number of endangered and provide key ecosystem services such as filtering pollutants and from the rivers. Most famously, the bay is a key link in the and with millions of annually visiting the bay shallows as a refuge, is the most important component of the flyway south of . Many endangered species of birds are also found here: the California least tern, the California clapper rail, the , and the black crowned night heron.

There is also a significant diversity of present in the bay. populations in California have dramatically declined due to human and natural causes; in the Bay Area, all naturally spawned steelhead populations below natural and manmade impassable barriers in California streams from the Russian River to , and the drainages of San Francisco, San Pablo, and Suisun Bays are listed as threatened under the Federal Endangered Species Act. The Central California Coast population is the most endangered of the many troubled salmon populations on the west coast of the United States, including populations residing in to the San Francisco Bay. Industrial, mining, and other uses of mercury have resulted in a widespread distribution of that poisonous metal in the bay, with uptake in the bay's and contamination of its .

(2018). 9780387748153

Aquatic mammals are also present in the bay. Before 1825, Spanish, French, English, Russians and Americans were drawn to the Bay Area to harvest prodigious quantities of beaver, river otter, marten, fisher, mink, fox, weasel, harbor and and . This early fur trade, known as the California Fur Rush, was more than any other single factor, responsible for opening up the West and the San Francisco Bay Area, in particular, to world trade. By 1817 sea otter in the area were practically eliminated. Since then, the California golden beaver has re-established a presence in the . The North American river otter which was first reported in Redwood Creek at Muir Beach in 1996, has since been spotted in the North Bay's Corte Madera Creek, the South Bay's Coyote Creek, as well as in 2010 in San Francisco Bay itself at the Richmond Marina. Other mammals include the internationally famous who began inhabiting San Francisco's Pier 39 after the 1989 Loma Prieta earthquake and the locally famous Humphrey the Whale, a who entered San Francisco Bay twice on errant migrations in the late 1980s and early 1990s.

(1986). 9780893462703, Heian Intl Publishing Company.
Bottlenose dolphins and have recently returned to the bay, having been absent for many decades. Historically, this was the northern extent of their warm-water species range.


Birds
In addition to the many species of marine birds that can be seen in the Bay Area, many other species of birds make the Bay Area their home, making the region a popular destination for . Many birds, including many described in the following paragraphs, are listed as endangered species despite once being common in the region, due to human and other impacts.

were originally listed as a species of special concern by the California Department of Fish and Game in 1979. California's population declined 60% from the 1980s to the early 1990s, and continues to decline at roughly 8% per year. A 1992–93 survey reported little to no breeding burrowing owls in most of the western counties in the Bay Area, leaving only Alameda, Contra Costa, and counties as remnants of a once large breeding range. were once common in the Bay Area, but habitat destruction and thinning of eggs from poisoning reduced the California state population to 35 nesting pairs. Bald eagles disappeared from the Bay Area in 1915, and only began returning in recent years. In the 1980s an effort to re-introduce the species to the area began with the Santa Cruz Predatory Bird Research Group and the San Francisco Zoo importing birds and eggs from and northeastern California, and there are now nineteen nesting couples in eight of the Bay Area's nine counties. Other once absent species that have returned to the Bay Area include Swainson’s hawk, white tailed kite, and the .

In 1927, zoologist wrote that osprey were only rare visitors to the San Francisco Bay Area, although he noted records of one or two used nests in the broken tops of trees along the Russian River. In 1989, the southern breeding range of the osprey in the Bay Area was , although osprey were noted to be extending their range further south in the Central Valley and the Sierra Nevada. In 2014, a Bay Area-wide survey found osprey had extended their breeding range southward with nesting sites as far south as Hunters Point in San Francisco on the west side and Hayward on the east side, while further studies have found nesting sites as far south as the Los Gatos Creek watershed, indicating that the nesting range now includes the entire length of San Francisco Bay.

(2007). 9780979603808, Santa Clara Valley Audubon Society. .
Most nests were built on man-made structures close to areas of human disturbance, likely due to lack of mature trees near the Bay. The population was introduced in the 1960s by state game officials, and by 2015 have become a common sight in East Bay communities.


Geology and landforms

The Bay Area is well known for the complexity of its landforms that are the result of millions of years by the forces of , since the region is located in the middle of a meeting point between two plates. Nine out of eleven distinct assemblages have been identified in a single county, Alameda. Preliminary geologic map emphasizing bedrock formations in Alameda County, California: A digital database USGS Publication Diverse assemblages adjoin in complex arrangements due to offsets along the many faults (both active and stable) in the area. As a consequence, many types of rock and soil are found in the region. The oldest rocks are metamorphic rocks that are associated with granite in the west of the San Andreas fault. These were formed from rocks of , , and in uplifted seabeds. Volcanic deposits also exist in the Bay Area, left behind by the movement of the San Andreas fault, whose movement sliced a subduction plate and allowed magma to briefly flow to the surface.

The region has considerable vertical relief in its landscapes that are not in the leading to the bay or in inland valleys. The topography, and geologic history, of the Bay Area can largely be attributed to the compressive forces between the Pacific Plate and the North American plate. The three major ridge structures in the Bay Area, part of the Pacific Coast Range, are all roughly parallel to the major faults. The Santa Cruz Mountains along the San Francisco Peninsula and the in Marin County follow the San Andreas fault, The , San Leandro Hills and their southern ridgeline extension through roughly follow the , and the , which includes and Mount Hamilton and runs along the .

In total, the Bay Area is traversed by seven major systems with hundreds of related faults, all of which are stressed by the relative motion between the and the North American Plate or by compressive stresses between these plates. The fault systems include the Hayward Fault Zone, , , Clayton-Marsh Creek-Greenville Fault, Rodgers Creek Fault, and the San Gregorio Fault. Significant blind (faults with near vertical motion and no surface ruptures) are associated with portions of the Santa Cruz Mountains and the northern reaches of the and . These "hidden" faults, which are not as well known, pose a significant earthquake hazard. Among the more well-understood faults, scientists estimate a 63% probability of a magnitude 6.7 earthquake occurring along either the Hayward, Rogers Creek, or San Andreas fault, with an earthquake more likely to occur in the East Bay. Two of the largest earthquakes in recent history were the 1906 San Francisco earthquake and the 1989 Loma Prieta earthquake.


Hydrography
The Bay Area is home to a complex network of watersheds, marshes, rivers, creeks, reservoirs, and bays that predominantly drain into the San Francisco Bay and . The largest bodies of water in the Bay Area are the San Francisco, San Pablo, and estuaries. Major rivers of the North Bay include the , the , the , and the Russian River; the former two drain into San Pablo Bay, the latter two into the . In the South Bay, the Guadalupe River drains into San Francisco Bay near Alviso. There are also several lakes present in the Bay Area, including man-made lakes like and natural albeit heavily modified lakes like .

Prior to the introduction of European agricultural methods, the shores of San Francisco Bay consisted mostly of tidal marshes. Today, the bay has been significantly altered heavily re-engineered to accommodate the needs of water delivery, shipping, agriculture, and urban development, with side effects including the loss of wetlands and the introduction of contaminants and .Kimmerer, W. (2004). "Open water process of the San Francisco Estuary: from physical forcing to biological responses. " San Francisco Estuary and Watershed Science 2(1). pp. 1–13. Approximately 85% of those marshes have been lost or destroyed, but about 50 marshes and marsh fragments remain. Huge tracts of the marshes were originally destroyed by farmers for agricultural purposes, then repurposed to serve as salt evaporation ponds to produce salt for food and other purposes. Today, regulations limit the destruction of tidal marshes, and large portions are currently being rehabilitated to its natural state.


Government and politics
Government in the San Francisco Bay Area consists of multiple actors, including 101 city and nine county governments, a dozen regional agencies, and a large number of single-purpose special districts such as municipal utility districts and . Incorporated cities are responsible for providing police service, zoning, issuing building permits, and maintaining public streets among other duties. California Government Code Title 4, Government of Cities County governments are responsible for elections and voter registration, vital records, property assessment and records, tax collection, public health, agricultural regulations, and building inspections, among other duties.
(1998). 9780520214866, Public Policy Institute of California/University of California Press. .
(2018). 9781442203389, Rowman & Littlefield Publishers. .
Public education is provided by independent school districts, which may be organized as elementary districts, high school districts, unified school districts combining elementary and high school grades, or community college districts, and are managed by an elected school board. A variety of special districts also exist and provide a single purpose, such as delivering public transit in the case of the Bay Area Rapid Transit District, or monitoring air quality levels in the case of the Bay Area Air Quality Management District.

Politics in the Bay Area is widely regarded as one of the most liberal in and in the . Since the late 1960s, the Bay Area cemented its role as the most liberal region in California politics, supporting the Democratic Party's candidates for U.S. President and continued to support Democratic candidates more than other regions of the state, even as California trended towards the Democratic Party over time. According to research by the Public Policy Institute of California, the Bay Area and the North Coast counties of Humboldt and Mendocino were the most consistently and strongly liberal areas in California.

According to the California Secretary of State, the Democratic Party holds a voter registration advantage in every congressional district, state senate district, state assembly district, State Board of Equalization district, all nine counties, and all but three of the 101 incorporated municipalities in the Bay Area. On the other hand, the Republican Party holds a voter registration advantage in only one state assembly subdistrict (the portion of California's 4th State Assembly district in Solano county) and three cities, Atherton, Hillsborough, and Danville. According to the Cook Partisan Voting Index (CPVI), congressional districts the Bay Area tends to favor Democratic candidates by roughly 40 to 50 percentage points, considerably above the mean for California and the nation overall.

19.5%
23.7%
12.9%
23.4%
31.1%
25.5%
29.0%
22.0%
21.3%

In U.S. Presidential elections since 1960, the nine-county Bay Area voted for Republican candidates only three times, in all three cases voting for a Californian: in 1972 for and again in 1980 and 1984 for . The last county to vote for a Republican Presidential candidate was Napa county in 1988 for George H. W. Bush. Since then, all nine Bay Area counties have voted consistently for the Democratic candidate. Currently, both of California's U.S. Senators are Democrats, and all twelve U.S. congressional districts located wholly or partially in the Bay Area are represented by a Democratic representative. Additionally, every Bay Area member of the California State Senate and the California State Assembly is a registered Democrat, except for , who represents California's 16th State Assembly district.

The association between the Bay Area and progressive politics has led the term "San Francisco values" being used by commentators in a pejorative sense to describe the secular progressive culture in the area.


Transportation
Transportation in the San Francisco Bay Area is reliant on a complex multimodal infrastructure consisting of roads, bridges, highways, rail, tunnels, airports, ferries, and bike and pedestrian paths. The development, maintenance, and operation of these different modes of transportation are overseen by various agencies, including the California Department of Transportation (Caltrans), San Francisco Municipal Transportation Agency, and the Metropolitan Transportation Commission. These and other organizations collectively manage several interstate highways and state routes, two networks, two agencies, eight trans-bay bridges, transbay ferry service, local service, three international airports (San Francisco, San Jose, and Oakland), and an extensive network of roads, tunnels, and paths such as the San Francisco Bay Trail.

The Bay Area hosts an extensive freeway and highway system that is particularly prone to traffic congestion, with one study by concluding that the Bay Area's traffic was the fourth worst in the world. There are some city streets in San Francisco where gaps occur in the freeway system, partly the result of the Freeway Revolt, which prevented a freeway-only thoroughfare through San Francisco between the San Francisco–Oakland Bay Bridge, the western terminus of Interstate 80, and the southern terminus of the Golden Gate Bridge (U.S. Route 101). Additional damage that occurred in the wake of the 1989 Loma Prieta earthquake resulted in freeway segments being removed instead of being reinforced or rebuilt, leading to the revitalization of neighborhoods such as San Francisco's Embarcadero. The greater Bay Area contains the three principal north-south highways in California: Interstate 5, U.S. Route 101, and California State Route 1. U.S. 101 and State Route 1 directly serve the traditional nine-county region, while Interstate 5 bypasses to the east in San Joaquin County to provide a more direct –Sacramento route. Additional local highways connect the various subregions of the Bay Area together.

There are over two dozen agencies in the Bay Area with overlapping service areas that utilize different modes, with designated connection points between the various operators. Bay Area Rapid Transit (BART), a / system, operates in four counties and connects San Francisco and Oakland via an underwater tube. Other systems link San Francisco with the Peninsula and San Jose (), San Jose with the and San Joaquin County (ACE), and Sonoma with Marin County (SMART). In addition, provides frequent commuter service between San Jose and the East Bay with Sacramento, and long distance service to other parts of the . operates a hybrid / system within the city of San Francisco, and VTA operates a system in Santa Clara County. These rail systems are supplemented by numerous bus agencies and transbay such as Golden Gate Ferry and the San Francisco Bay Ferry. Most of these agencies accept the , a reloadable contactless smart card, as a universal electronic payment system.


See also
  • List of metropolitan areas of the United States
  • Coastal California
  • List of companies based in the San Francisco Bay Area
  • Lists of San Francisco Bay Area topics
  • Timeline of the San Francisco Bay Area


External links

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