They also give predictions on those numbers in the year 2022. Not surprisingly, New York City had the most high net worth individuals with 7,580 and a projected 10,306 in 2022. However, that 36 percent increase doesn’t come close to the estimated growth in some other more unexpected cities. S?o Paulo is one of those, with 1,880 multi-millionaires now, and an anticipated 143 percent jump, taking the count to 4,566 in 2022. The second largest city in Brazil, Rio de Janeiro, is where Knight Frank notes a 146 percent rise from 1,740 to 4,285 over the next 10 years. Beijing, Mumbai and San Francisco also made the lustrous list.