Brandon Sloter/Getty ImagesThe Bay Area came second in Henley & Partners' ranking, with about 305,700 millionaires as of December 2023. Its millionaire population grew by 82% between 2013 and 2023, indicating an increase of about 136,000 millionaires in the space of just 10 years.
The Bay Area encompasses the cities of San Francisco, San Jose, and Oakland and notably includes the tech hub of Silicon Valley, which is home to companies including Google parent company Alphabet, HP, and PayPal.
It also has the US' biggest billionaire population, the Henley & Partners' ranking shows, with nearly 70 billionaires living in the area as of December.