Started in Sunnyvale, National Semi, Fairchild. Then Santa Clara with a little company called Intel.oh. Not Apple Valley
Easy to mix up the Valleys over there.
If I am correct there is no such thing as a postal code called Silicon Valley, correct" Its just a geographic area.
It is basically San Mateo in the north, then South Bay Area.
My Dad was a management engineer and came from Florida to work at Lockheed in fall '66. In late '69 he put a down payment on a filthy expensive 3/2 new home in Sunnyvale. Listed at 31K (mostly Doctors on the street); he paid like $26.5. We sold it after my folks passed away for $1.9M and it's $3M now.
FYI, Palo Alto is probably the most expensive per square foot in the US. My co-worker went through a divorce and bought a small 2/1 fixer upper in Palo Alto on Waverly back in the early 2000's I think. Her neighbors were "the 2 Steves", Jobs and Young. I bet Tanya's place could be $5M now.
Here's Jobs' place, on the corner. He later bought a mansion in Woodside so he could make deals at Buck's.