Santa Clara County, California
Santa Clara County
|County of Santa Clara|
Location in the state of California
Latitude and Longitude:
|Region||San Francisco Bay Area|
|Incorporated||February 18, 1850 |
|Named for||Mission Santa Clara de Asís, St. Clare of Assisi|
|County seat||San Jose|
|Largest city||San Jose|
|• Total||1,304 sq mi (3,380 km2)|
|• Land||1,290 sq mi (3,300 km2)|
|• Water||14 sq mi (40 km2)|
|Highest elevation||4,216 ft (1,285 m)|
| • Estimate |
|• Density||1,400/sq mi (530/km2)|
|Time zone||UTC−8 ( Pacific)|
|• Summer ( DST)||UTC−7 ( Pacific Daylight Time)|
|Area codes||408/669, 650|
|GNIS feature ID||277307|
Santa Clara County, officially the County of Santa Clara, is California's 6th most populous county, with a population of 1,781,642, as of the 2010 census.  The county seat and largest city is San Jose, the 10th most populous city in the United States, California's 3rd most populous city and the most populous city in the San Francisco Bay Area.
Home to Silicon Valley, Santa Clara County is an economic center for high technology and has the third highest GDP per capita in the world (after Zurich, Switzerland and Oslo, Norway), according to the Brookings Institution.  The county's concentration of wealth, primarily due to the tech industry, has made it the most affluent county on the West Coast of the United States and one of the most affluent places in America.  
Santa Clara County is part of the San Jose- Sunnyvale- Santa Clara, CA Metropolitan Statistical Area as well as the San Jose- San Francisco- Oakland, CA Combined Statistical Area. Located on the southern coast of San Francisco Bay, the urbanized Santa Clara Valley within Santa Clara County is also known as Silicon Valley. Santa Clara is the most populous county in the San Francisco Bay Area and in Northern California.
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Santa Clara County was one of the original counties of California, formed in 1850 at the time of statehood. The original inhabitants included the Ohlone, residing on Coyote Creek and Calaveras Creek. Part of the county's territory was given to Alameda County in 1853.
In 1882, Santa Clara County tried to levy taxes upon property of the Southern Pacific Railroad within county boundaries. The result was the U.S. Supreme Court case of Santa Clara County v. Southern Pacific Railroad, 118 U.S. 394 (1886), in which the Court extended Due Process rights to artificial legal entities.
In the early 20th Century, the area was promoted as the "Valley of the Heart's Delight" due to its natural beauty, including a significant number of orchards. 
The first major technology company to be based in the area was Hewlett-Packard, founded in a garage in Palo Alto in 1939. IBM selected San Jose as its West Coast headquarters in 1943. Varian Associates, Fairchild Semiconductor, and other early innovators were located in the county by the late 1940s and 1950s. The U.S. Navy had a large presence in the area and began giving large contracts to Silicon Valley electronics companies. The term " Silicon Valley" was coined in 1971. The trend accelerated in the 1980s and 1990s, and agriculture has since then been nearly eliminated from the northern part of the county. Today, Santa Clara County is the headquarters for approximately 6500 high technology companies, including many of the largest tech companies in the world, among them hardware manufacturers AMD, Cisco Systems and Intel, computer and consumer electronics companies Apple Inc. and Hewlett-Packard, and internet companies eBay, Google, and Yahoo!. Most of what is considered to be Silicon Valley is located within the county, although some adjoining tech regions in San Mateo (e.g., Facebook), Alameda, and Santa Cruz counties are also considered part of Silicon Valley.
Counties which border with Santa Clara County are, clockwise, Alameda County, San Joaquin (within a few hundred feet at Mount Boardman), Stanislaus, Merced, San Benito, Santa Cruz, and San Mateo County. Santa Clara County formerly shared borders with Contra Costa, Mariposa, Monterey, and Tuolumne counties until 1853, 1874, and 1854 respectively (Monterey County currently comes within a few miles of Santa Clara).
In 1978, California Department of Fish and Game warden Henry Coletto urged the department to choose the Mount Hamilton area as one of California's relocation sites under a new statewide effort to restore tule elk (Cervus canadensis ssp. nannodes). While other ranchers refused, tech pioneers Bill Hewlett and David Packard allowed Coletto and state biologists to translocate the initial 32 tule elk from the Owens Valley in the eastern Sierra onto the 28,000-acre (11,000 ha) San Felipe Ranch, which the families jointly own, in the hills east of Morgan Hill.  From the three original 1978–1981 translocations (totaling 65 animals) to the Mount Hamilton region of the Diablo Range, there are multiple herds in different locations including the Isabel Valley, San Antonio Valley, Livermore area, San Felipe Ranch, Metcalf Canyon, Coyote Ridge, Anderson Lake, and surrounding areas such as the Sunol and Cottonwood Creek (near San Luis Reservoir) herds. As of 2012 [update], an estimated 400 tule elk roam 1,875 square kilometres (724 sq mi) in northeastern Santa Clara County and southeastern Alameda County.  In March 2014 CDFW translocated nine bull elk from the San Luis National Wildlife Refuge to add genetic diversity to the San Antonio Valley Ecological Reserve herd in San Antonio Valley in extreme eastern Santa Clara County.  As of 2017 there were four herds in the Coyote Ridge area, often visible from U. S. Highway 101, according to Craige Edgerton, recently retired executive director of the Silicon Valley Land Conservancy and local naturalist Michael Hundt.  In 2019, a fifth herd of tule elk was documented by local naturalist Roger Castillo, likely having split from the Coyote Ridge herd and established itself in Silver Creek Valley around the closed Ranch Golf Club. 
Pronghorn (Antilocapra americana) were historically native to Santa Clara County. In June 1776, Lieutenant Commander Don Jose Joaquin Morago led a group of soldiers and colonists from the Presidio of Monterey to establish Mission San Francisco de Asis and found pronghorn: “In the said plains of San Bernardino [Santa Clara Valley]…there is another species of deer about the size of three-year-old sheep. They are similar in appearance to the deer, except that they have short horns and also short legs like the sheep. They live in the plains where they go in herds of 100, 200, or more. They run all together over the plains so fast that they seem to fly…These animals are called berrendos and there are many of them also in the southern Missions wherever the country is level.”  In 1990, the California Department of Fish and Game's Henry Coletto translocated excess pronghorn from Modoc County to six locations in California, including 51 animals to the San Felipe Ranch in Santa Clara County, where the swift-footed ungulates had not lived for generations.  The animals left the San Felipe Ranch for the Isabel and San Antonio Valleys, as well as an area near Lake Del Valle in Alameda County may now be extirpated by poaching, highway vehicle collisions, and insufficient numbers to defend pronghorn fawns against coyote predation.  As of 2012, the Isabel Valley Ranch herd had dwindled to 3 animals, and the Lake del Valle herd to 13.  Currently, iNaturalist.org has zero observer records of pronghorn in Santa Clara County. 
The Nature Conservancy "Mount Hamilton Project" has acquired or put under conservation easement 100,000 acres (40,000 ha) of land towards its 500,000 acres (200,000 ha) goal for habitat conservation within a 1,200,000 acres (490,000 ha) area encompassing much of eastern Santa Clara County as well as portions of southern Alameda County, western Merced and Stanislaus Counties, and northern San Benito County. Acquisitions to date include the 1,756-acre (711 ha) Rancho Cañada de Pala, straddling the Alameda Creek and Coyote Creek watersheds for California tiger salamander habitat; a conservation easement on the 3,259-acre Blue Oak Ranch Reserve, which abuts the north side of Joseph D. Grant County Park; a conservation easement on the 28,359-acre San Felipe Ranch, connecting Joseph D. Grant County Park with Henry W. Coe State Park; the 2,899-acre South Valley Ranch which protects a tule elk herd in the San Antonio Valley, and other properties.  
As of 1980 [update], Santa Clara County has the highest number of Superfund Sites of any county in the United States, accounting for 25 polluted locations requiring a long-term response to clean up hazardous material contaminations.   The vast majority of these Superfund sites were caused by firms associated with the high tech sector located in Silicon Valley. 
|Population, race, and income|
|Total population ||1,762,754|
|Black or African American ||45,219||2.6%|
|American Indian or Alaska Native ||9,906||0.6%|
|Native Hawaiian or other Pacific Islander ||6,445||0.4%|
|Some other race ||171,082||9.7%|
|Two or more races ||72,803||4.1%|
|Hispanic or Latino (of any race) ||468,262||26.6%|
|Per capita income ||$40,698|
|Median household income ||$89,064|
|Median family income ||$103,255|
|Places by population and race|
|Place||Type ||Population ||White ||Other
|Asian ||Black or African
|Hispanic or Latino|
(of any race) 
|Los Altos Hills||Town||7,912||66.2%||1.9%||31.7%||0.1%||0.0%||1.9%|
|Places by population and income|
|Place||Type ||Population ||Per capita income ||Median household income ||Median family income |
|Los Altos Hills||Town||7,912||$109,694||$218,077||$230,000|
|U.S. Decennial Census
1790–1960  1900–1990 
1990–2000  2010–2015 
The 2010 United States Census reported that Santa Clara County had a population of 1,781,642. The ethnic makeup of Santa Clara County was 836,616 (47.0%) White, 46,428 (2.6%) African American, 12,960 (0.7%) Native American, 570,524 (32.0%) Asian, 7,060 (0.4%) Pacific Islander, 220,806 (12.4%) from other races, and 87,248 (4.9%) from two or more races. Hispanic or Latino of any race were 479,210 persons (26.9%) of the population. 
Demographic profile 
|Population reported at 2010 United States Census|
(of any race)
|Santa Clara County||1,781,642||836,616||46,428||12,960||570,524||7,060||220,806||87,248||479,210|
cities and towns
(of any race)
|Los Altos Hills||7,922||5,417||37||4||2,109||8||50||297||213|
(of any race)
(of any race)
|All others not CDPs (combined)||30,494||21,985||439||256||3,175||84||3,234||1,321||7,651|
As of the census  of 2000, there are 1,682,585 people, 565,863 households, and 395,538 families residing in the county. The population density is 503/km² (1,304/mi²). There are 579,329 housing units at an average density of 173/km² (449/mi²). The ethnic makeup of the county is 53.8% White, 2.8% Black or African American, 0.7% Native American, 25.6% Asian, 0.3% Pacific Islander, 12.1% from other races, and 4.7% from two or more races. 24.0% of the population are Hispanic or Latino of any race.
There were 565,863 households out of which 34.9% had children under the age of 18 living with them, 54.9% were married couples living together, 10.0% had a female householder with no husband present, and 30.1% were non-families. 21.4% of all households were made up of individuals and 5.9% had someone living alone who was 65 years of age or older. The average household size was 2.92 and the average family size was 3.41.
In the county, the population was spread out with 24.7% under the age of 18, 9.3% from 18 to 24, 35.4% from 25 to 44, 21.0% from 45 to 64, and 9.5% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 102.80 males. For every 100 females age 18 and over, there were 101.90 males.
The median income for a household in the county was $74,335, and the median income for a family was $81,717. Males had a median income of $56,240 versus $40,574 for females. The per capita income for the county was $32,795. About 4.9% of families and 7.5% of the population were below the poverty line, including 8.4% of those under age 18 and 6.4% of those age 65 or over.
Santa Clara County has five elected supervisors, elected within their districts.
The county is one among three counties in California (with Napa and Madera) to establish a separate department, the Santa Clara County Department of Corrections, to deal with corrections pursuant to California Government Code §23013.
The county also pays the $340,000 salary and benefits of the California state Department of Social Services director, which is reimbursed by the state, skirting the $165,000 state law cap for the position. 
- California's 17th congressional district, represented by Democrat Ro Khanna,
- California's 18th congressional district, represented by Democrat Anna Eshoo,
- California's 19th congressional district, represented by Democrat Zoe Lofgren, and
- California's 20th congressional district, represented by Democrat Jimmy Panetta. 
- the 10th Senate District, represented by Democrat Bob Wieckowski,
- the 13th Senate District, represented by Democrat Jerry Hill,
- the 15th Senate District, represented by Democrat Jim Beall, and
- the 17th Senate District, represented by Democrat Bill Monning.
- the 24th Assembly District, represented by Democrat Marc Berman,
- the 25th Assembly District, represented by Democrat Kansen Chu,
- the 27th Assembly District, represented by Democrat Ash Kalra,
- the 28th Assembly District, represented by Democrat Evan Low,
- the 29th Assembly District, represented by Democrat Mark Stone, and
- the 30th Assembly District, represented by Democrat Robert Rivas.
Voters in the county also elect a number of other officials to county-wide positions, including the Santa Clara County District Attorney, the Santa Clara County Sheriff, and a large number of criminal and civil judges that serve in courts throughout the county.
Historically, Santa Clara County was a Republican stronghold in presidential elections. From 1892 until 1988, the only Democrats to carry Santa Clara County were Franklin Roosevelt, Lyndon Johnson, and Hubert Humphrey. Since 1988, Santa Clara County has been a Democratic stronghold in presidential and congressional elections. The last Republican to win a majority in the county was Ronald Reagan in 1984. While Republicans remained competitive at the state and local level throughout the 1990s, there are currently no elected Republicans representing the county above the local level.
According to the California Secretary of State, as of February 10, 2019, Santa Clara County has 895,965 registered voters. Of those, 405,470 (45.3%) are registered Democrats, 151,213 (16.9%) are registered Republicans, and 308,769 (35.4%) have declined to state a political party. 
As of November 2012, all of the cities, towns, and the unincorporated areas of Santa Clara County have more registered Democrats than Republicans.  In the 2008 US Presidential Election, Democratic nominee Barack Obama carried every city and town in the county, as well as the unincorporated areas. 
Following the passage of Proposition 8, Santa Clara County joined San Francisco and Los Angeles in a lawsuit, becoming, along with San Francisco and Los Angeles, the first governmental entities in the world to sue for same-sex marriage. 
|Population and registered voters|
|Total population ||1,762,754|
|Registered voters  [note 3]||817,310||46.4%|
|Democratic–Republican spread ||+195,711||+23.9%|
|Peace and Freedom ||1,950||0.2%|
|Americans Elect ||36||0.0%|
|No party preference ||237,357||29.0%|
|Cities by population and voter registration|
|City||Population ||Registered voters
|Democratic ||Republican ||D–R spread ||Other ||No party preference |
|Los Altos Hills||7,912||73.6%||34.9%||33.6%||+1.3%||4.3%||28.7%|
The following table includes the number of incidents reported in 2009 and the rate per 1,000 persons for each type of offense.
|Population and crime rates|
|Violent crime ||5,013||2.84|
|Forcible rape ||387||0.22|
|Aggravated assault ||3,081||1.75|
|Property crime ||23,790||13.50|
|Larceny-theft  [note 4]||28,303||16.06|
|Motor vehicle theft ||7,356||4.17|
|Cities by population and crime rates|
|City||Population ||Violent crimes ||Violent crime rate
per 1,000 persons
|Property crimes ||Property crime rate|
per 1,000 persons
|Los Altos Hills||8,121||5||0.62||45||5.54|
The county's economy is heavily service based. Technology, both hardware and software, dominates the service sector by value, but like any other county, Santa Clara has its share of retail and office support workers.
The San Jose/Sunnyvale/Santa Clara metropolitan region, comprising Santa Clara County and San Benito County, was ranked as the highest performing metropolitan area in the US in 2012, ahead of Austin, Texas and Raleigh, North Carolina, according to the Milken Institute.  The GDP of the metro area reached $176.7 billion in 2011, or $94,587 per capita,  roughly on par with Qatar in both total GDP and per capita (nominal).  GDP grew a strong 7.7% in 2011, and in contrast with most of California, GDP and per capita GDP (nominal) is well above 2007 (financial crisis) levels. Despite relative wealth vis a vis other regions nationally, a large underclass exists whose income is roughly equivalent to that elsewhere in the country, despite extreme land prices. The surge in metro GDP is highly correlated with home prices, which for average single-family homes passed $1 million ($1,017,528) in August 2013. 
Santa Clara County Library, is a public library system serving the communities and cities of Campbell, Cupertino, Gilroy, Los Altos, Los Altos Hills, Milpitas, Monte Sereno, Morgan Hill, Saratoga, and all unincorporated areas of the county.  All other cities run their own library system.
The county's main airport is Norman Y. Mineta San José International Airport (SJC). It is a U.S. Customs and Border Protection port of entry  and as of 2019 has five international routes (one to Canada, one to England, one to Japan, one to Mexico, and one to China) but the airport's busiest routes are all to cities in the western United States. San Francisco International Airport (SFO) is also often used for commercial services by residents of Santa Clara County.
Moffett Federal Airfield (NUQ), a former U.S. Naval Air Station, is used by the Air National Guard, NASA, Lockheed Martin, Google, and by the San Jose Police and Santa Clara County Sheriff's Department as an air operations base.  There are also smaller general aviation airports in Palo Alto (PAO), San Jose (Reid-Hillview) (RHV), and San Martin(E16)
Santa Clara County is served by Caltrain commuter rail from Gilroy through San Jose and Silicon Valley north to San Francisco Airport and San Francisco. The Santa Clara Valley Transportation Authority operates the VTA light rail system, which primarily serves San Jose, with one line continuing as far north as Mountain View. Santa Clara and San Jose are also served by the Altamont Corridor Express commuter rail line which provides services to Stockton, and Amtrak which provides service to Sacramento and Oakland. The Amtrak Coast Starlight train between Seattle and Los Angeles also stops in San Jose. In the future, BART will provide service to San Jose and Santa Clara.
Santa Clara County has consolidated its transportation services into the Santa Clara Valley Transportation Authority, which operates a bus system.
The Santa Clara Valley Transportation Authority is establishing a bicycle network throughout the county. Santa Clara County Bicycle network is part of the San Francisco Bay Area Regional Bikeway Network.
- Bikeways Map (Effective April 2011)
- Regional Bicycle Plan for the San Francisco Bay Area 2009 Update
The county has an extensive freeway system and a separate expressway system (though it's not as extensive as those in Southern California). Expressways in California are distinct from freeways; although access to adjoining properties is eliminated, at-grade intersections are allowed. However, unlike expressways virtually everywhere else in California, the Santa Clara County expressways were built, signed, and maintained as county roads; they are not maintained by Caltrans, although they are patrolled by the California Highway Patrol.
There is also a large street network dominated by four- and six-lane arterials. Some of the newer boulevards (primarily in the West Valley) are divided with landscaped medians.
The county has no commercial seaports, although small boats can access San Francisco Bay from several points. Like many other Bay Area counties, it is dependent upon the Port of Oakland for transport of ocean cargo.
Santa Clara County Department of Correction is administered by the county's sheriff's office and supervises the following facilities:
- Santa Clara County Main Jail
- Main Jail South (up to 674 men)
- Main Jail North (up to 919 men)
- Elmwood Correctional Facility (up to 600 women, 2,500 men) 
- North County Jail (day use only for Palo Alto courthouse)
- Juvenile Detention
- Santa Clara County Juvenile Hall (up to 390 boys and girls)
- William F. James Boys Ranch (up to 96 teenage boys)
Santa Clara County has an extensive park system, much of it founded in the major park expansion of the late 1970s. Parks within the county include:
Open space preserves include:
Santa Clara County also contains Ulistac Natural Area, a volunteer maintained natural open space. Foreign and invasive species are removed when possible as native plants are introduced. Migratory birds and butterflies often use this area.
To promote friendship and understanding and to build bridges with countries of origin for various ethnic populations in the county, the County of Santa Clara has created a Sister County Commission to coordinate the program. As of 2009, there are three sister counties: 
- Province of Florence, Italy
- Moscow Area, Russia
- Hsinchu County, Taiwan Province, Republic of China (Taiwan)
There are 15 incorporated places in Santa Clara County, they are...
- Almaden Township: Present-day Almaden Valley, Cambrian Park and portions of Campbell and Los Gatos.
- Alviso Township: Present-day Alviso.
- Burnett Township: Present-day Coyote, Santa Teresa and Morgan Hill.
- Fremont Township: Present-day Palo Alto, Sunnyvale, Mountain View, Los Altos, Los Altos Hills and part of Cupertino.
- Gilroy Township: Present-day Gilroy and San Martin.
- Milpitas Township: Present-day Milpitas.
- Redwood Township: Present-day Los Gatos, Monte Sereno, Saratoga, Redwood Estates and portions of Cupertino and Campbell.
- San Jose Township: Most of present-day San Jose.
- Santa Clara Township: Present-day Santa Clara and portions of San Jose, Cupertino and Campbell.
† county seat
|Rank||City/Town/etc.||Municipal type||Population (2010 Census)
|1||† San Jose||City||945,942|
|17||Los Altos Hills||Town||7,922|
- List of attractions in Silicon Valley
- List of school districts in Santa Clara County, California
- National Register of Historic Places listings in Santa Clara County, California
- Santa Clara County expressway system
- Santa Clara County Federal Credit Union
- Santa Clara Valley
- Other = Some other race + Two or more races
- Native American = Native Hawaiian or other Pacific Islander + American Indian or Alaska Native
- Percentage of registered voters with respect to total population. Percentages of party members with respect to registered voters follow.
- Only larceny-theft cases involving property over $400 in value are reported as property crimes.
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- Official website
- Santa Clara Valley Water District - Drinking Water
- List of special districts in Santa Clara County (LAFCo)
- Santa Clara County Library
- Santa Clara County: California's Historic Silicon Valley, a National Park Service Discover Our Shared Heritage Travel Itinerary