It's been a while since Ive seen a thread on this topic so here's an update.
So Forbes has this map you can navigate through that has the number of billionaires there are in individual areas. I combined them by CSA(for example, I combined NY and Fairfield county). I wish I was better versed at German metro configurations because there are so many close to each other but I wasnt sure if they could be considered a single area? Same goes for the Pearl River Delta and Yangtze River Delta, massive concentrations of billionaires but Im not sure about merging them.
I selected cities with 10 or more.
Forbes Billionaires by City, 2020:
134 New York
95 San Francisco
71 Hong Kong
70 Moscow
67 Beijing
62 Los Angeles
58 London
46 Shanghai
44 Shenzhen
40 Miami
38 Mumbai
30 Singapore
29 Guangzhou
28 Seoul
26 Hangzhou
24 Taipei
23 Dallas
19 Istanbul
19 Sao Paulo
18 Boston
18 Delhi
18 Paris
17 Bangkok
17 Tokyo
16 Chicago
16 Stockholm
15 Houston
15 Washington
14 Manila
14 Ningbo
13 Madrid
12 Atlanta
12 Bangalore
12 Chengdu
12 Toronto
11 Dubai
11 Geneva
11 Mexico City
11 Milan
11 Montreal
11 Seattle
11 Xiamen
10 Phoenix
10 Rio de Janeiro
10 Sydney
10 Tel Aviv
Here's the link to their interactive map:
https://www.forbes.com/billionaires/
Here's North America's Areas by Forbes' own boundaries--before I merged a bunch of them together...
116 Greater New York Area
64 Greater San Francisco Area
55 Greater Los Angeles Area
37 Greater Palm Beach Area
25 Greater Palo Alto Area
23 Greater Dallas Area
16 Greater Boston Area
16 Greater Chicago Area
15 Greater Greenwich Area
15 Greater Houston Area
12 Atlanta, GA
12 Greater Washington DC Area
11 Mexico City, DF
11 Montreal, QC
10 Greater Phoenix Area
10 Greater Seattle Area
9 Toronto, ON
8 Austin, TX
8 Greater Las Vegas Area
6 Greater Denver Area
6 Greater Detroit Area
6 Greater Tampa Area
5 Greater Bryn Mawr Area
5 Greater San Diego Area
5 Naples, FL
5 Vancouver, BC
4 Greater Nashville Area
4 Greater Oakland Area
4 Greater Oklahoma City Area
4 Greater Ventura Area
4 Jackson, WY
4 St Louis, MO
3 Cary, NC
3 Cleveland, OH
3 Greater Baltimore Area
3 Greater Portland Area
3 Omaha, NE
3 Provo, Utah
3 Racine, WI
3 San Antonio, TX