Meet the 10 richest Americans!

It's again raining billionaires in America. As the economy recovers from the  recession, the wealthy have more reasons to cheer about.

While 217 of the business tycoons are now worth more than they were a year ago, only 84 of the billionaires saw a decrease in wealth.

In 2009, 314 billionaires saw a dip in their in their wealth. The top 10 billionaires who lost $40 billion last year, gained $24.9 billion this year.

The richest Forbes 400 are worth a combined $1.37 trillion, compared with $1.27 trillion last year.

Facebook's Mark Zuckerberg, ranked at 35, saw his wealth tripling to $6.9 billion.

Click NEXT to find out who are the top 10 richest Americans . . .

1. Bill Gates

Bill Gates, founder of Microsoft, is undisputedly the richest person in the United States for the 17th year in a row. His net worth is estimated to be $54 billion, up $4 billion from last year, according to the latest Forbes 400 list.

He is also one of the most generous billionaires, contributing a whopping $28 billion for various philanthropic initiatives.

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2. Warren Buffett

Warren Buffett, also known as the Oracle of Omaha, is the second richest American.

His wealth rose from $33.2 billion in 2001 to $45 billion in 2010, up $5 billion from last year.

A self-made billionaire and a philanthropist, Buffett has asked America's richest to gift half their fortunes to charity.

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3. Larry Ellison

Oracle founder Larry Ellison's net worth is unchanged, at $27 billion.

His wealth rose from $21.9 billion in 2001.

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4. Christy Walton

Christy Walton, inherited her wealth from John Walton after he died in air crash in 2005.

Here wealth rose from $15.7 billion in 2005 to $24 billion in 2010.

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5. Charles Koch

Charles Koch, chairman and CEO of Koch Industries, is No. 5 on the list. His wealth rose from $3.2 billion in 2001 to $21.5 billion in 2010.

Koch Industries is the second largest privately held company (after Cargill) by revenue in the United States.

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6. David Koch

David Koch, brother of  Charles Koch is a businessman, a philanthropist and a political activist.

He is a co-owner and an executive vice president of Koch Industries. His wealth rose from $3.2 billion in 2001 to $21.5 billion in 2010.

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7. Jim Walton

Jim Walton is the youngest son of Wal-mart founder, Sam Walton. Today Wal-Mart, one of the largest general retail chains has sales of $405 billion.

His wealth rose from $17.5 billion in 2001 to $20.1 billion in 2010.

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8. Alice Walton

Alice Walton spearheads the Walton Family Foundation's involvement in developing the Crystal Bridges - Museum of American Art.

Daughter of Wal-mart founder Sam Walton, her wealth rose from $17.5 billion in 2001 to $20 billion in 2010.

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9. Robson Walton

S Robson is the eldest son of Sam Walton, founder of Wal-Mart. He is currently the chairman of Wal-Mart. Walton's wealth rose from $17.5 billion in 2001 to $19.7 billion in 2010.

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10. Michael Bloomberg

A self-made billionaire, Michael Bloomberg, Mayor of New York City, is the tenth richest American.

He is the founder of Bloomberg, a financial news and information services media company. His wealth rose $4 billion in 2001 to $18 billion in 2010.