Istanbul ranked eleventh on the list with 26 billionaries holding the total of $39 billion.

Here are the top 25 cities with the most billionaires in the world: 

25-Palo Alto

Billionaire Population: 13
Combined Net Worth: $124.9B
Richest Individual: Mark Zuckerberg ($44.6B)

25-Geneva

Billionaire Population: 13
Combined Net Worth: $41.5B
Richest Individual: Gennady Timchenko ($11.4B)

25-Chicago

Billionaire Population: 13
Combined Net Worth: $36.6B
Richest Individual: Ken Griffin ($7.5B

21-Dubai

Billionaire Population: 14
Combined Net Worth: $37B
Richest Individual: Majid Al Futtaim ($5B)

21-Delhi

Billionaire Population: 14
Combined Net Worth: $42.7B
Richest Individual: Shiv Nadar ($11.1B)

21-Bangkok

Billionaire Population: 14
Combined Net Worth: $42.2B
Richest Individual: Charoen Sirivadhanabhakdi ($10.7B)

21-Sao Paulo

Billionaire Population: 14
Combined Net Worth: $54.1B
Richest Individual: Joseph Safra ($17.2B)

20-Milan

Billionaire Population: 15
Combined Net Worth: $59.2B
Richest Individual: Leonardo Del Vecchio ($18.7B)

18-Guangzhou

Billionaire Population: 16
Combined Net Worth: $38.8B
Richest Individual: Hui Ka Yan ($8.6B)

18-Dallas

Billionaire Population: 16
Combined Net Worth: $51B
Richest Individual: Andrew Beal ($9.4B)

17-Hangzhou

Billionaire Population: 17
Combined Net Worth: $60.8B
Richest Individual: Jack Ma ($20.5B

16-Tokyo

Billionaire Population: 18
Combined Net Worth: $62.3B
Richest Individual: Tadashi Yanai ($14.6B)

14-Taipei

Billionaire Population: 20
Combined Net Worth: $42.4B
Richest Individual: Terry Gou ($5.6B)

14-Los Angeles

Billionaire Population: 20
Combined Net Worth: $70.7B
Richest Individual: Patrick Soon-Shiong ($11.9B)

13-Singapore

Billionaire Population: 21
Combined Net Worth: $54.5B
Richest Individual: Robert & Philip Ng ($7.6B)

12-Paris

Billionaire Population: 22
Combined Net Worth: $147.9B
Richest Individual: Lilane Bettencourt ($36.1B)

11-Istanbul

Billionaire Population: 26
Combined Net Worth: $39B
Richest Individual: Murat Ulker ($2.9B)

10-San Francisco

Billionaire Population: 28
Combined Net Worth: $74.5B
Richest Individual: Dustin Moskovitz ($8.9B)

8-Shenzhen

Billionaire Population: 30
Combined Net Worth: $78B
Richest Individual: Ma Huateng ($16.6B)

8-Seoul

Billionaire Population: 30
Combined Net Worth: $73.9B
Richest Individual: Lee Kun-Hee ($9.6B)

7-Shanghai

Billionaire Population: 31
Combined Net Worth: $66.1B
Richest Individual: Tsai Eng-Meng ($6B)

6-Mumbai

Billionaire Population: 32
Combined Net Worth: $115.1B
Richest Individual: Mukesh Ambani ($19.3B)

5-London

Billionaire Population: 48
Combined Net Worth: $187.7B
Richest Individual: Len Blavatnik ($15.3B)

4-Beijing

Billionaire Population: 51
Combined Net Worth: $149.9B
Richest Individual: Wang Jianlin ($28.7B)

3-Moscow

Billionaire Population: 60
Combined Net Worth: $217.6B
Richest Individual: Leonid Mikhelson ($14.4B

2-Hong Kong

Billionaire Population: 68
Combined Net Worth: $261.3B
Richest Individual: Li Ka-shing ($27.1B)

1-New York City

Billionaire Population: 79
Combined Net Worth: $364.6B
Richest Individual: Michael Bloomberg ($40B)

Source:Forbes