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Richest People In America 2012

The 2012 Forbes 400 has been released, according to the magazine 70% of the 400 richest people in United States are self-made billionaires. This year's list featured 20 newcomers who climbed into the ranks, only four inherited their wealth; including Steve Jobs’ wife, Laurene Powell Jobs, who is the richest newcomer with a net worth of $11 billion. Microsoft co-founder Bill Gates remains the United States' richest man by far, as the tech and philanthropist took the top spot on the Forbes 400 list for the 19th year running, with an estimated net worth of $66 billion.

Here's the Top 20 Richest People In United States as of 2012:

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20 No. 1 Bill Gates

Net Worth:

$66 billion - As of September 2012Source of Wealth: Microsoft, self-made , Age: 56 , Citizenship: U.S.

19 No. 2 Warren Buffett

Net Worth:

$46 billion - As of September 2012Source of Wealth: Berkshire Hathaway, self-made , Age: 82 , Citizenship: U.S.

18 No. 3 Larry Ellison

Net Worth:

$41 billion - As of September 2012Source of Wealth: Oracle, self-made , Age: 68 , Citizenship: U.S.

17 No. 4 Charles Koch (tie)

Net Worth:

$31 billion - As of September 2012Source of Wealth: Diversified, inherited and growing , Age: 76, Citizenship: United States

16 No. 4 David Koch (tie)

Net Worth:

$31 billion - As of September 2012Source of Wealth: Diversified, inherited and growing , Age: 71 , Citizenship: United States

15 No. 6 Christy Walton & family

Net Worth:

$27.9 billion - As of September 2012Source of Wealth: Walmart, inherited , Age: 57 , Citizenship: U.S.

14 No. 7 Jim Walton

Net Worth:

$26.8 billion - As of September 2012Source of Wealth: Walmart, inherited , Age: 64 , Citizenship: United States

13 No. 8 Alice Walton

Net Worth:

$26.3 billion - As of March 2012Source of Wealth: Walmart, inherited , Age: 62 , Citizenship: United States

12 No. 9 R. Robson Walton

Net Worth:

$26.1 billion - As of September 2012Source of Wealth: Walmart, inherited , Age: 68 , Citizenship: United States

11 No. 10 Michael Bloomberg

Net Worth:

$25 billion - As of September 2012Source of Wealth: Bloomberg LP, self-made , Age: 70 , Citizenship: U.S.

10 No. 11 Jeff Bezos

Net Worth:

$23.2 billion - As of September 2012Source of Wealth: Amazon.com, self-made , Age: 48, Citizenship: United States

9 No. 12 Sheldon Adelson

Net Worth: $20.5 billion - As of September 2012Source of Wealth: Casinos, self-made , Age: 79 , Citizenship: United States

8 No. 13 Sergey Brin

Net Worth:

$20.3 billion - As of September 2012Source of Wealth: Google, self-made , Age: 39 , Citizenship: U.S.

7 No. 13 Larry Page

Net Worth:

$20.3 billion - As of September 2012Source of Wealth: Google, self-made , Age: 39 , Citizenship: U.S.

6 No. 15 George Soros

Net Worth:

$19 billion - As of September 2012Source of Wealth: Hedge Funds, self-made , Age: 82 , Citizenship: U.S.

5 No. 16 Forrest Mars, Jr.

Net Worth:

$17 billion - As of September 2012Source of Wealth: Candy , Age: 81, Citizenship: United States

4 No. 16 Jacqueline Mars

Net Worth:

$17 billion - As of September 2012Source of Wealth: Candy , Age: 72, Citizenship: United States

3 No. 16 John Mars

Net Worth:

$17 billion - As of September 2012Source of Wealth: Candy , Age: 72 , Citizenship: United States

2 No. 19 Steve Ballmer

Net Worth:

$15.9 billion - As of September 2012Source of Wealth: Microsoft, self-made, Age: 56 , Citizenship: United States

1 No. 20 Paul Allen

Net Worth:

$15 billion - As of September 2012Source of Wealth: Microsoft, investments, self-made, Age: 59 , Citizenship: United States

[See full list on Forbes.com]

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