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Re:Tech workers think Silicon Valley and startups are losing... by largote on Saturday July 09, 2016 @09:48PM (#12064198)
It's generally considered to be where San Mateo county ends and Santa Clara county begins, in other words, between Palo Alto and Mountain View.
Re:Tech workers think Silicon Valley and startups are losing... by ScottBurson on Sunday July 10, 2016 @03:50AM (#12064887)
Palo Alto is in Santa Clara County.

Any line is somewhat arbitrary, of course, but I would put it between Mountain View and Sunnyvale.