As for the next decade, it's impossible to know how long the economic downturn due to the coronavirus will last, but "gains in wealth are likely to be delayed," Wealth-X predicts.

Here are the 10 leading cities for the wealthy for 2019 and 2020

10. Dallas 

Number of individuals with a net worth of $5 million or more: 36,515 Percentage of global population: 1.2%

9. Washington, D.C.

Number of individuals with a net worth of $5 million or more: 37,495 Percentage of global population: 1.3%

8. San Francisco

Number of individuals with a net worth of $5 million or more: 39,390  Percentage of global population: 1.3%

7. Chicago

Number of individuals with a net worth of $5 million or more: 44,795 Percentage of global population: 1.5%

6. Paris

Number of individuals with a net worth of $5 million or more: 49,005 Percentage of global population: 1.7%

5. London

Number of individuals with a net worth of $5 million or more: 50,305  Percentage of global population: 1.7%

4. Los Angeles

Number of individuals with a net worth of $5 million or more: 71,035 Percentage of global population: 2.4%

3. Hong Kong

Number of individuals with a net worth of $5 million or more: 73,430 Percentage of global population: 2.5%

2. Tokyo

Number of individuals with a net worth of $5 million or more: 81,645 Percentage of global population: 2.8%

1. New York

Number of individuals with a net worth of $5 million or more: 120,605 Percentage of global population: 4.1%