
3. San Jose-Santa Clara, California
These 3 cities combined make up a Metropolitan Statistical Area in California which had a population of just under 2 million in April 2010. This area has shown a population growth of 7.7% in the years between 2010 and 2016. The GDP per capita for this statistical area amounted to $127,595 in 2016.

The City of San Jose is overall the 3rd most populated city in California and is also the biggest city in Northern California. This city has its home in Santa Clara County which ranks as one of the most cities nationally and statewide. San Jose is home to Silicon Valley which inevitably has accelerated its economy to dazzling heights. Sunnyvale is also in Santa Clara County and has a population of 140,095, making it the seventh-most populated city located in the San Francisco Bay Area. Sunnyvale also forms part of Silicon Valley. Along with aerospace and defense companies, there are also other huge technology companies that have headquarters here.

Santa Clara is Southeast of San Francisco and is also located in Santa Clara County. Its population is the 9th biggest in the San Francisco Bay Area and has a size of 116,468 people. Silicon Valley Power is located in Santa Clara. The electricity rate in this city is considerably lower than the rest of Northern California due to the 147 megawatts of electricity that this company produces and supplies.

Being such an affluent county, there are obviously countless households that are afforded a six-figure income. They are however not afforded the lifestyle which one would assume. Assuming the monthly income after taxes is $6,291 for each household. If expenses for the same household are $6,212 each month then even a 6-figure income household will spend 99% of their income on living expenses.