1. Jacqueline Mars ($20.5 Billion)
She is the granddaughter of Frank C. Mars, who was the founder of the Mars candy bar company in America. Jacqueline Mars is currently the third richest woman in the United States. Though she inherited this wealth, she does spend quite a bit of time with charitable activities. She is a strong supporter of the National Symphony Orchestra and operates as Vice President of the U.S. Equestrian Team.