As of 2013, the region employed about a quarter of a million information technology workers. It was in Silicon Valley that the silicon-based integrated circuit, the microprocessor, and the microcomputer, among other technologies, were developed.

Silicon Valley also accounts for one-third of all of the venture capital investment in the United States, which has helped it to become a leading hub and startup ecosystem for high-tech innovation. Silicon Valley is home to many of the world's largest high-tech corporations, including the headquarters of more than 30 businesses in the Fortune 1000, and thousands of startup companies. The San Jose Metropolitan Area has the third-highest GDP per capita in the world (after Zurich, Switzerland and Oslo, Norway), according to the Brookings Institution, and, as of June 2021, has the highest percentage of homes valued at $1 million or more in the United States. San Jose is Silicon Valley's largest city, the third-largest in California, and the tenth-largest in the United States other major Silicon Valley cities include Sunnyvale, Santa Clara, Redwood City, Mountain View, Palo Alto, Menlo Park, and Cupertino. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical Santa Clara Valley. Silicon Valley is a region in Northern California that serves as a global center for high technology and innovation.

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