You’re most likely to have a 10-digit neighbor if you live in the United States, China or India, but which are the cities where the most billionaires reside?
We’ve combed through the ranks to find the top 20.
#1 New York
Billionaire population: 82
Combined net worth: $397.9 billion
Richest individual: David Koch ($48.3 billion)
That’s a flip-flop from the Forbes 400 List of richest Americans in September 2016, when Bloomberg was richer than Koch.
#2 Hong Kong
Billionaire population: 75
Combined net worth: $297.8 billion
Richest individual: Li Ka-shing ($31.2 billion)
#3 Moscow
Billionaire population: 73
Combined net worth: $297 billion
Richest individual: Leonid Mikhelson ($18.4 billion)
Vladimir Lisin, the country’s biggest gainer, saw his fortune climb $6.8 billion in one year (to $16.1 billion) thanks in part to rallying steel prices and a stronger Russian ruble. He chairs NLMK Group, one of the world’s largest steel producers, whose shares rose 69% in a year.
#4 Beijing
Billionaire population: 54
Combined net worth: $161.3 billion
Richest individual: Wang Jianlin ($31.3 billion)
His Dalian Wanda Group opened Wanda City, a $3 billion theme park complex last May in Nanchang, in the southeastern Jiangxi Province, in an attempt to compete with Walt Disney’s theme parks.
#5 London
Billionaire population: 50
Combined net worth: $217.3 billion
Richest individual: Len Blavatnik ($20 billion)
Since their home retailer, BHS, collapsed, 19,000 British workers’ pensions have been at risk. In October 2016, the parliament voted to strip Philip Green of his knighthood. In late February, he agreed to pay about $450 million to cover the pension deficit.
#6 Mumbai
Billionaire population: 41
Combined net worth: $149.1 billion
Richest individual: Mukesh Ambani ($23.2 billion)
His Reliance Industries is locked in a legal battle with the government over developing a gas field. The company’s 4G phone service Jio, which launched last September, has secured 100 million subscribers to date.
#7 Shanghai
Billionaire population: 40
Combined net worth: $91.9 billion
Richest individual: Liu Yongxing ($6.6 billion)
Among them is Yu Huijiao (net worth: $3.6 billion), who took his delivery business YTO Express public via a reverse merger on the Shanghai Stock Exchange in October 2016.
#8 Seoul
Billionaire population: 37
Combined net worth: $91.4 billion
Richest individual: Kun-Hee Lee ($15.1 billion)
#9 Shenzhen
Billionaire population: 35
Combined net worth: $129.4 billion
Richest individual: Ma Huateng ($24.9 billion)
Robotics, real estate and electronics helped mint many of the resident billionaires, including the world’s first drone billionaire, Frank Wang ($3.6 billion). Wang is the founder and CEO of drone maker SZ Dajiang Innovation Technology.
#10 San Francisco
Billionaire population: 32
Combined net worth: $86.6 billion
Richest individual: Dustin Moskovitz ($10.7 billion)
Companies such as Uber, Airbnb, Pinterest and Twitter all have founders or executives in our ranks.
#11 Singapore
Billionaire population: 25
Combined net worth: $67.8 billion
Richest individuals: Robert & Philip Ng ($8.7 billion)
Their 300-room Park Hotel Farrer Park and Farrer Square Medical Suites, both in Singapore’s Little India district, and the 226-room InterContinental Hotel at Robertson Quay are due to open in mid-2017.
#12 Hangzhou
Billionaire population: 24
Combined net worth: $86.6 billion
Richest individual: Jack Ma ($28.3 billion)
They are Jonathan Lu ($1.1 billion), Lucy Peng ($1.1 billion) and the city’s richest person Alibaba founder and chairman Jack Ma ($28.3 billion).
#13 (Tie) Istanbul
Billionaire population: 23
Combined net worth: $39.3 billion
Richest individual: Murat Ulker ($3.7 billion)
He owns 5-star hotel brand World of Wonders, which operates ten such hotels across Turkey. His hotels are concentrated in Turkey’s most important tourism regions, including Antalya, Bodrum and Istanbul.
#13 (Tie) Taipei
Billionaire population: 23
Combined net worth: $57.1 billion
Richest individual: Terry Gou ($7.5 billion)
Taipei’s wealthiest man, Terry Gou ($7.5 billion), is $1.9 billion richer than last year thanks to shares of his Hon Hai Precision Industry climbing 30% in 12 months. The company, better known as Foxconn, is the world’s biggest maker of smartphones.
#13 (Tie) Tokyo
Billionaire population: 23
Combined net worth: $81.4 billion
Richest individual: Masayoshi Son ($21.2 billion)
In July 2016, the company announced it would acquire British semiconductor design firm ARM Holdings for $31 billion in cash. In late March Softbank said it would invest $300 million in office rental firm WeWork.
#16 Sao Paulo
Billionaire population: 22
Combined net worth: $82.3 billion
Richest individual: Joseph Safra ($20.5 billion)
Eight of the city’s billionaires owe their fortune to banks, including Brazil’s second richest man, Joseph Safra ($20.5 billion), who owns three banks.
#17 Los Angeles
Billionaire population: 21
Combined net worth: $74.5 billion
Richest individual: Elon Musk ($13.9 billion)
Among them are 26-year old Evan Spiegel ($4 billion), who cofounded Snap Inc. (formerly called Snapchat).
#18 (Tie) Paris
Billionaire population: 18
Combined net worth: $155.4 billion
Richest individual: Bernard Arnault ($41.5 billion)
They have switched spots in the past year, with Arnault passing Bettencourt in the ranks.
It rose 41% over the last year amidst a flurry of new deals and acquisitions.
#20 (Tie) Delhi
Billionaire population: 17
Combined net worth: $54.7 billion
Richest individual: Shiv Nadar ($12.3 billion)
#20 (Tie) Guangzhou
Billionaire population: 17
Combined net worth: $56.3 billion
Richest individual: William Ding ($17.3 billion)
The industry responsible for the most billionaires in Guangzhou? Real estate.