About Santa Clara County

Santa Clara County, officially the County of Santa Clara, is a county located at the southern end of the San Francisco Bay Area in the U.S. state of California. As of 2010 it had a population of 1,781,642. The county seat is San Jose. The highly urbanized Santa Clara Valley within Santa Clara County is also known as Silicon Valley. Santa Clara is the most populous county in the Bay Area region, and one of the most affluent counties in the United States.

Santa Clara County is named after Mission Santa Clara, which was established in 1777, and is also named for Saint Clare of Assisi.

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.

Once promoted as the "Valley of the Heart's Delight", after two centuries of an agricultural economy started by the Spanish missionaries, the focus has shifted to technology. This trend is not new. Hewlett Packard was founded in 1939, and 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, as agriculture has been nearly eliminated from the northern part of the county. Today, Santa Clara County is the headquarters for such companies as AMD, Apple, Cisco Systems, eBay, Facebook, Google, Hewlett Packard, Intel, Sun Microsystems, Yahoo, and many others. The valley is currently home to approximately 6500 high technology companies. Most of Silicon Valley's (Santa Clara Valley) high tech companies are located within the county, with some adjoining tech regions in San Mateo, Alameda, and Santa Cruz counties also being considered Silicon Valley.

Santa Clara currently has the highest amount of Superfund Sites of any other 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.