The Cargill-MacMillans – $42.3B
The Cargill-MacMillan clan comes with fourteen billionaires. Whoa. Not only are they among the richest families in the United States, but they are also one of the richest in the whole world. The flagship family business was launched by William W. Cargill in 1865. They produced palm oil and grain as well as traded in transport, energy, and steel. It is also responsible for raising livestock, feed ingredients production, and feed production. It is the largest privately-owned company in America, which means they do not disclose financial information. Perhaps they are even richer than we already think!

The Cargill-MacMillans – $42.3B