No. 6: Anne Cox Chambers

Forbes: The Richest Women in America

Net Worth: $10.7 billion
Source of Wealth: Cox Enterprises
Age: 92
Overall Rank: 32

At age 92, Chambers continues to sit on the board of privately held Cox Enterprises, which owns cable company Cox Communications, the Cox Media Group of newspapers, TV and radio stations, the Manheim automobile auction and AutoTrader.com. Her father, James M. Cox (d.1957), founded the company in 1898.

(Photo by Ron Galella, Ltd./WireImage)

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No. 10: Randa Wi... Net Worth: $4.7 billion
Source of Wealth: Enterprise Products Partners
Age: 51
Overall Rank: 72

Williams is the eldest of four children of the late energy pipeline entrepreneur Dan Duncan, founder of Enterprise Products Partners.

(Photo by Agapito Sanchez)

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No. 9: Milane Fr... Net Worth: $4.7 billion
Source of Wealth: Enterprise Products Partners
Age: 43
Overall Rank: 72

Frantz is one of four children who inherited the massive fortune of late energy pipeline entrepreneur Dan Duncan, founder of Enterprise Products Partners.

(Photo by Agapito Sanchez)

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No. 8: Dannine A... Net Worth: $4.7 billion
Source of Wealth: Enterprise Products Partners
Age: 48
Overall Rank: 72

Avara is one of four children who inherited the massive fortune of late energy pipeline entrepreneur Dan Duncan, founder of Enterprise Products Partners.

(Photo via Forbes)

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No. 7: Blair Par... Net Worth: $5.4 billion
Source of Wealth: Cox Enterprises
Age: 61
Overall Rank: 61

The granddaughter of Cox Enterprises founder James M. Cox (d. 1957) inherited a 25% stake in the media company in 2007. It has revenues of nearly $15 billion.

(Photo by Tim Rue/Bloomberg via Getty Images)

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No. 6: Anne Cox ... Net Worth: $10.7 billion
Source of Wealth: Cox Enterprises
Age: 92
Overall Rank: 32

At age 92, Chambers continues to sit on the board of privately held Cox Enterprises, which owns cable company Cox Communications, the Cox Media Group of newspapers, TV and radio stations, the Manheim automobile auction and AutoTrader.com. Her father, James M. Cox (d.1957), founded the company in 1898.

(Photo by Ron Galella, Ltd./WireImage)

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The Forbes 400: The Richest People In America
The 100 Women Who Run the World
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No. 5: Laurene P... Net Worth: $11 billion
Source of Wealth: Apple, Disney
Age: 48
Overall Rank: 28

The widow of legendary Apple co-founder Steve Jobs inherited a fortune after Jobs died in October 2011 that makes her the wealthiest woman in Silicon Valley.

(Photo by Andrew Harrer/Bloomberg via Getty Images)

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No. 4: Abigail J... Net Worth: $11.8 billion
Source of Wealth: Fidelity
Age: 50
Overall Rank: 27

The current president of Fidelity Financial Services may someday step into the CEO role of the company, which was founded by her grandfather in 1946.

(Photo by Brian Snyder/REUTERS)

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No. 3: Jacquelin... Net Worth: $17 billion
Source of Wealth: Mars
Age: 72
Overall Rank: 16

Jacqueline and her siblings, John and Forrest, Jr., own $33 billion (estimated sales) in Mars, the world's largest candy company.

(Photo by Jay Mallin/Bloomberg via Getty Images)

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No. 2: Alice Wal... Net Worth: $26.3 billion
Source of Wealth: Wal-Mart
Age: 63
Overall Rank: 8

The heiress is the daughter of Wal-Mart founder Sam Walton and a noted philanthropist. Last year, she opened Crystal Bridges Museum of American Art in the town of Bentonville, Ark., where Wal-Mart is headquartered.

(Photo by Ketih Myers/Kansas City Star/MCT)

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No. 1: Christy W... Net Worth: $27.9 billion
Source of Wealth: Wal-Mart
Age: 57
Overall Rank: 6

The richest woman in the world holds most of her wealth in Wal-Mart, the retailer founded by her father-in-law Sam Walton and his brother James in 1962.

(Photo by L. Matthew Bowler)

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More from Forbes Click here to see all 20 of the richest American women.

(Photo by John Leyba/The Denver Post)