The 15 richest women in America, ranked

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15. Nancy Walton Laurie, a Walmart heiress, is worth $6.7 billion.

15. Nancy Walton Laurie, a Walmart heiress, is worth $6.7 billion.

Net worth: $6.7 billion

Source of wealth: Walmart

Age: 68

Walton Laurie is the daughter of Bud Walton, who co-founded Walmart with his brother, Sam Walton. After her father's death in 1995, she inherited half of his stake in the company. The other half went to her sister, who is also on this list.

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14. Diane Hendricks is the richest self-made woman in America and has a net worth of $7 billion.

14. Diane Hendricks is the richest self-made woman in America and has a net worth of $7 billion.

Net worth: $7 billion

Source of wealth: ABC Supply

Age: 72

Diane Hendricks, the richest self-made woman in America, made her fortune by founding wholesale roofing distributor ABC Supply in 1982 with her husband. She has been at the helm of the company since his death in 2007 and used her wealth to revitalize Beloit, Wisconsin where the company is based.

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T13. Victoria Mars is one of four sisters who benefited from her family's massive candy and pet food company. She has a net worth of $7.4 billion.

T13. Victoria Mars is one of four sisters who benefited from her family's massive candy and pet food company. She has a net worth of $7.4 billion.

Net worth: $7.4 billion

Source of wealth: Mars Inc.

Age: 62

Mars is the great-granddaughter of Frank Mars, who founded the eponymous candy company in 1911. At one point, she was the chair of the board of directors. When her father passed away in 2016, she inherited an 8% stake in the company, as did her three sisters, who are also included on this list.

T13. Valerie Mars also has a net worth of $7.4 billion.

T13. Valerie Mars also has a net worth of $7.4 billion.

Net worth: $7.4 billion

Source of wealth: Mars Inc.

Age: 60

One of the four Mars sisters, Valerie started working at Mars Incorporated in 1992 and is the vice president of corporate development. She is also on the board of directors of Fiat Chrysler Automobiles.

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T13. Pamela Mars also has a net worth of $7.4 billion.

T13. Pamela Mars also has a net worth of $7.4 billion.

Net worth: $7.4 billion

Source of wealth: Mars Inc.

Age: 59

One of the four Mars sisters, Pamela Mars initially joined the family business as an operations supervisor. She ultimately became chairman of the board but later stepped down.

T13. Marijke Mars is the fourth Mars sister who has Snickers candy bars to thank for a $7.4 billion net worth.

T13. Marijke Mars is the fourth Mars sister who has Snickers candy bars to thank for a $7.4 billion net worth.

Net worth: $7.4 billion

Source of wealth: Mars Inc.

Age: 55

Marijke, another Mars sister, also serves on the company's board of directors. The family is exceedingly private.

Read more: Income inequality in the US has hit a record high. Meet the 15 richest American family 'dynasties,' who have a combined net worth of $618 billion.

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9. Ann Walton Kroenke has a net worth of $7.5 billion.

9. Ann Walton Kroenke has a net worth of $7.5 billion.

Net worth: $7.5 billion

Source of wealth: Walmart

Age: 70

Walton Kroenke is the daughter of Bud Walton, who co-founded Walmart with his brother, Sam Walton. After her father's death in 1995, she inherited half of his stake in the company. The other half went to her sister, who is also on this list.

8. Christy Walton married into Walmart's Walton family and is now worth $8.5 billion.

8. Christy Walton married into Walmart's Walton family and is now worth $8.5 billion.

Net worth: $8.5 billion

Source of wealth: Walmart

Age: 70

Christy Walton was married to John Walton, the second-oldest child of Walmart founder, Sam Walton. John died in a plane crash in 2005, leaving Christy 17% of his wealth. She now uses that fortune as a philanthropist supporting land and sea conservation.

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7. Blair Parry-Okeden has a net worth of $9.6 billion.

7. Blair Parry-Okeden has a net worth of $9.6 billion.

Net worth: $9.6 billion

Source of wealth: Cox Enterprises

Age: 69

Even though she is an American citizen, Blair Parry-Okeden primarily lives in Australia. Forbes named her the richest person in Australia in 2016. She inherited a 25% stake in Cox Enterprises when her mother, Barbara Cox Anthony, passed away in 2007. Cox, the automotive and media company, is based in Atlanta, Georgia. Parry-Okeden is known to be private to the point of reclusive.

6. Abigail Johnson, the CEO of Fidelity Investments, is worth $14 billion.

6. Abigail Johnson, the CEO of Fidelity Investments, is worth $14 billion.

Net worth: $14 billion

Source of wealth: Fidelity Investments

Age: 57

Abigail Johnson's grandfather founded Fidelity Investments more than 70 years ago. The company currently has $2.7 trillion in managed assets. After 26 years of working at the firm, Johnson became the CEO in 2014 and the chairman of the board in 2016. She has an estimated 24.5% stake in the company.

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5. Laurene Powell Jobs and family have a net worth of $21.3 billion.

5. Laurene Powell Jobs and family have a net worth of $21.3 billion.

Net worth: $21.3 billion

Source of wealth: Apple and Disney

Age: 55

Laurene Powell Jobs and her family inherited the fortune of her husband, Steve Jobs, upon his death in 2011. At one point, she had 5.5 million shares of Apple stock and a 7.3% stake in The Walt Disney Company. She has used those to fund her philanthropic efforts, specifically the creation of the Emerson Collective, an organization dedicated to social change through education, immigration reform, media and journalism.

Read more: Ben Affleck and Laurene Powell-Jobs were seen getting dinner together at a Los Angeles restaurant

4. Jacqueline Mars, another member of the Mars. Inc dynasty, is worth $29.7 billion.

4. Jacqueline Mars, another member of the Mars. Inc dynasty, is worth $29.7 billion.

Net worth: $29.7 billion

Source of wealth: Mars Inc.

Age: 80

Jacqueline Mars is the granddaughter of the founder of Mars Inc. She is said to own a third of the Snickers and M&M's candy empire. Another third belongs to her brother John, and the rest of the shares are split between her four nieces, who are also featured on this list. She donates to educational, environmental, cultural, and health-related causes.

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3. MacKenzie Bezos is newly worth $36.1 billion.

3. MacKenzie Bezos is newly worth $36.1 billion.

Net worth: $36.1 billion

Source of wealth: Amazon

Age: 49

MacKenzie Bezos and Amazon founder Jeff Bezos finalized their divorce earlier this year after 25 years of marriage. The settlement resulted in MacKenzie retaining 25% of the couples' shares, or 4% of the company. The divorce made her Amazon's second-largest individual shareholder. In April, she signed a pledge to donate half of her fortune to charity.

2. Julia Koch and her children are worth $41 billion after recently inheriting a stake in Koch industries.

2. Julia Koch and her children are worth $41 billion after recently inheriting a stake in Koch industries.

Net worth: $41 billion

Source of wealth: Koch Industries

Age: 57

Julia Koch was married to industrialist and conservative donor David Koch, who died in August. She and her three children inherited a 42% stake in Koch Industries.

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1. Alice Walton of the Walmart dynasty has a net worth of $51.4 billion, which makes her the richest woman in the world.

1. Alice Walton of the Walmart dynasty has a net worth of $51.4 billion, which makes her the richest woman in the world.

Net worth: $51.4 billion

Source of wealth: Walmart

Age: 70

Alice Walton is the only daughter of Walmart founder Sam Walton. She is not involved with Walmart; she spends her fortune collecting art and breeding horses. Her cousins are also on this list.

The Waltons are the wealthiest family dynasty in the US, with the Koch family and the Mars family trailing behind.