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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Average net worth of the 400 wealthiest Americans rose to a record $4.2 billion.

The net worth of the richest Americans grew by 13 per cent in the past year to $1.7 trillion, according to Forbes magazine.

The average net worth of the 400 wealthiest Americans rose to a record $4.2 billion, up more than 10 per cent from a year ago, while the lowest net worth came in at $1.1 billion versus $1.05 billion last year, the magazine said. Seven in 10 of the list's members made their fortunes from scratch.

Source: Forbes

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Bill Gates with his wife Melinda

Bill Gates

Net worth: $66 billion

Age: 56

Source: Microsoft

Residence: Medina, Washington

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Warren Buffett with his wife Astrid Menks.

Warren Buffett

Net worth: $46 billion

Age: 82

Source: Berkshire Hathaway

Residence: Omaha, Nebraska

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Larry Ellison.

Larry Ellison

Net worth: $41 billion

Age: 68

Source: Oracle

Residence: Woodside, California

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Charles Koch, inset.

Charles Koch

Net worth: $31 billion

Age: 76

Source: Diversified

Residence: Wichita, Kansas

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
David Koch, inset.

David Koch

Net worth: $31 billion

Age: 72

Source: Diversified

Residence: New York, New York

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Christy Walton, inset.

Christy Walton and family

Net worth: $27.9 billion

Age: 57

Source: Walmart

Residence: Jackson, Wyoming

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Jim Walton, left, Alice Walton, centre, and Rob Walton, right, in Fayetteville, Arkansas.

Jim Walton

Net worth: $26.8 billion

Age: 64

Source: Walmart

Residence: Bentonville, Arkansas

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Alice Walton, inset.

Alice Walton

Net worth: $26.3 billion

Age: 62

Source: Walmart

Residence: Fort Worth, Texas

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Sam Robson Walton with his wife Carolyn.

S Robson Walton

Net worth: $26.1 billion

Age: 68

Source: Walmart

Residence: Bentonville, Arkansas

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Michael Bloomberg with his partner Diana Taylor.

Michael Bloomberg

Net worth: $25 billion

Age: 70

Source: Bloomberg

Residence: New York, New York

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Jeff Bezos with his wife Mackenzie.

Jeff Bezos

Net worth: $23.2 billion

Age: 48

Source: Amazon.com

Residence: Seattle, Washington

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Sheldon Adelson with his wife Miriam.

Sheldon Adelson

Net worth: $20.5 billion

Age: 79

Source: Casinos

Residence: Las Vegas, Nevada

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Sergey Brin with designer Diane von Furstenberg.

Sergey Brin

Net worth: $20.3 billion

Age: 39

Source: Google

Residence: Los Altos, California

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Larry Page.

Larry Page

Net worth: $20.3 billion

Age: 39

Source: Google

Residence: Los Altos, California

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
George Soros with girlfriend Tamiko Bolton.

George Soros

Net worth: $19 billion

Age: 82

Source: Hedge funds

Residence: Katonah, New York

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Forrest Mars, Junior, inset.

Forrest Mars, Jr

Net worth: $17 billion

Age: 81

Source: Candy

Residence: Big Horn, Wyoming

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Jacqueline Mars, inset.

Jacqueline Mars

Net worth: $17 billion

Age: 72

Source: Candy

Residence: The Plains, Virginia

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST

John Mars

Net worth: $17 billion

Age: 76

Source: Candy

Residence: Jackson, Wyoming

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Steve Ballmer.

Steve Ballmer

Net worth: $15.9 billion

Age: 56

Source: Microsoft

Residence: Hunts Point, Washington

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Paul Allen.

Paul Allen

Net worth: $15 billion

Age: 59

Source: Microsoft, investments

Residence: Mercer Island, Washington

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Carl Icahn.

Carl Icahn

Net worth: $14.8 billion

Age: 76

Source: Leveraged buyouts

Residence: New York, New York

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22 richest Americans in the world

Last updated on: September 21, 2012 08:54 IST
Michael Dell.

Michael Dell

Net worth: $14.6 billion

Age: 47

Source: Dell

Residence: Austin, Texas