New York, N.Y.

Number of billionaires: 60
Wealthiest resident: Michael Bloomberg ($18 billion)
Other notable billionaires: Ralph Lauren, Carl Icahn, Rupert Murdoch, Donald Trump, Mortimer Zuckerman

Moscow, Russia

Number of billionaires: 50
Wealthiest resident: Vladimir Lisin ($15.8 billion)
Other notable billionaires: Roman Abramovich, Alisher Usmanov, Oleg Deripaska

London, U.K.

Number of billionaires: 32
Wealthiest resident: Lakshmi Mittal ($28.7 billion)
Other notable billionaires: Richard Branson, Leonard Blavatnik, Alan Howard

Istanbul, Turkey

Number of billionaires: 28
Wealthiest resident: Husnu Ozyegin ($3 billion)
Other notable billionaires: Mehmet Emin Karamehmet, Sarik Tara, Ferit Sahenk

Los Angeles, Calif.

Number of billionaires: 27
Wealthiest resident: Eli Broad ($5.7 billion)
Other notable billionaires: Steven Spielberg, Sumner Redstone, Michael Milken, Ron Burkle
*Includes Beverly Hills, Malibu, Bel Air and Pacific Palisades

Hong Kong

Number of billionaires: 25
Wealthiest resident: Li Ka-shing ($21 billion)
Other notable billionaires: Lee Shau Kee, Kwok family, Robert Kuok, Cheng Yu-tung

Mumbai, India

Number of billionaires: 20
Wealthiest resident: Mukesh Ambani ($29 billion)
Other notable billionaires: Anil Ambani, Shashi & Ravi Ruia, Kumar Birla, Pallonji Mistry

Dallas, Texas

Number of billionaires: 17
Wealthiest resident: Andrew Beal ($4.5 billion)
Other notable billionaires: Henry Ross Perot Sr., Jerral Jones, T. Boone Pickens, Mark Cuban

San Francisco, Calif.

Number of billionaires: 14
Wealthiest resident: Larry Page ($17.5 billion)
Other notable billionaires: George Roberts, Ray Dolby, Gordon Getty
*There are 40 billionaires in the Bay Area. Among the places they live: San Francisco, Palo Alto, Atherton, Woodside, Marin County, Mountain View, Danville, Los Altos Hills and Menlo Park.

Tokyo, Japan

Number of billionaires: 14
Wealthiest resident: Tadashi Yanai & family ($7.6 billion)
Other notable billionaires: Nobutada Saji, Akira Mori, Masayoshi Son, Hiroshi Mikitani