Where is Silicon Valley?

Silicon Valley is not just a region, but an idea.

Most simply, it is the beautiful Valley of Heart’s Delight, home to 40 cities in the south San Francisco Bay Area which cross four counties: from San Mateo to Gilroy, Fremont to Scotts Valley, and beyond. The Valley includes the nation’s 10th largest city, San Jose, and cities small and large in Santa Clara, San Mateo, Santa Cruz, and southern Alameda Counties. Visit our interactive Cities and Counties page to learn what makes each one unique and to connect to our members.

Silicon Valley gave birth to the computer and information technology industries, is the heart of the biotech industry, and is leading today’s green revolution. Find out a bit about our History here.

The Valley boasts a variety of educational, recreational, and cultural resources that make our Lifestyle hard to beat.