#18 of 20 Pauline Mac Millan

Cargill Heiress:  Net Worth $6.8 Billion

Pauline MacMillan Keinath is an American billionaire heiress. Pauline MacMillan is from Hennepin County, Minnesota.  She is a great-granddaughter of William W. Cargill, the founder of Cargill, the largest private company in the US. As of December 2016, she has a net wealth of $6.8 billion from an inherited 9% stake in Cargill.