According to the Hurun Global Rich List 2023, New York City has the most billionaires in the world, with 113 billionaires. This is followed by Hong Kong with 105 billionaires, and San Francisco with 63 billionaires.

Here is a list of the top 10 cities with the most billionaires in the world:

1. New York City (113 billionaires)
2. Hong Kong (105 billionaires)
3. San Francisco (63 billionaires)
4. London (53 billionaires)
5. Beijing (49 billionaires)
6. Los Angeles (45 billionaires)
7. Shanghai (42 billionaires)
8. Munich (39 billionaires)
9. Chicago (38 billionaires)
10. Singapore (36 billionaires)

There are a number of factors that contribute to the number of billionaires in a city. These include the size of the city's economy, the presence of major industries, and the city's tax policies.

New York City is the financial capital of the world, and it is home to some of the world's largest and most successful companies. Hong Kong is also a major financial center, and it is home to a number of technology companies. San Francisco is home to the world's leading technology companies, such as Apple, Google, and Facebook.

These cities also have favorable tax policies for wealthy individuals. For example, New York City does not have a state income tax, and Hong Kong has a very low corporate tax rate. These factors make these cities attractive to wealthy individuals and businesses, which helps to drive the number of billionaires in these cities.

The number of billionaires in a city is also a reflection of the city's overall economic health. Cities with strong economies tend to have more billionaires. This is because these cities are able to attract and retain talented individuals and businesses, which creates the conditions for wealth creation.