Billionaires are congregating in a small coterie of cities around the globe. : San Francisco has more billionaires per inhabitant in the world — with one billionaire for approximately every 11,600 residents, according to data released Thursday by global wealth consultancy Wealth-X. San Francisco is followed by New York, Dubai and Hong Kong. In terms of numbers alone, New York has the largest billionaire population globally (105 individuals), followed by Hong Kong (87), San Francisco (75), Moscow (70), London (65) and Beijing (55). To put that in context, San Francisco has over 860,000 residents. New York has over 8.6 million.