I don’t get this.
The median income where I live(Boston suburb) is $110,000.00 per household. In San Jose it’s $81,000.00.
I always that these West Coast areas were much higher.
?
Apples and oranges comparison. That's your suburb. San Jose used to be a poor town of latinos working in surrounding fruit orchards. When the tech boom happened, it changed San Jose and it rapidly grew and expanded. Large areas are still full of poor latinos, and they pull down the income averages against high-paid tech workers.