Silicon Valley is a global center of technological innovation located in the South San Francisco Bay Area of California.

Silicon Valley, located in the southern San Francisco Bay Area of California, is home to many start-up and global technology companies. Apple, Facebook and Google are among the most prominent. It’s also the site of technology-focused institutions centered around Palo Alto's Stanford University. The Computer History Museum and NASA’s Ames Research Center are in Mountain View. The Tech Museum of Innovation is in San Jose.

Silicon Valley's population is approximately three million, and a large portion of its residents live within just six of its 39 cities. The population is growing rapidly – several cities are growing up to four times faster than the state as a whole.

Silicon Valley includes northwestern Santa Clara county as far inland as San Jose, as well as the southern bay regions of Alameda and San Mateo counties. Cities in this world-renowned valley include: Campbell, Cupertino, Gilroy, Los Altos, Los Gatos, Milpitas, Morgan Hill, Mountain View, Palo Alto, San Jose, Santa Clara, Saratoga and Sunnyvale.