In June of that year, he married Annie Rogers Zinn, the daughter of the locomotive maker Theodore Rogers (d. November 18, 1871) and Mary Andrews Rogers (d. March 11, 1918); Annie was the divorced wife of George Zinn.

[2] In 1878, at age 17, du Pont became a member of the Wilmington and Northern Railroad Company and was put in charge of all the farms that belonged to the company.

[3] He also served as secretary and treasurer of Repauno Chemical Company, of which Lammot du Pont I was president before his accidental death by a nitroglycerine explosion in 1884.

[4] After Lammot du Pont I's death, du Pont became president of both Repauno Chemical Company and Hercules Powder Company, which was owned by the Du Pont Company.

This article about an American businessperson born in the 1850s is a stub.