How large is the Silicon Valley? July 15, 2020 by Pamela Landy The stretch between San Jose and San Francisco is called Silicon Valley and runs 55 miles. Related Answers What was the name of the spaceship in Silent Running (1971)? How many dogs and cats are there in the United States? How many films did John Ford shoot in Monument Valley, on the Arizona-Utah line? How cold was it at Valley Forge in the winter of 1777? Where is the Red River valley? What states are part of the Tennessee Valley?