When David Byerly Croushorn was born on 12 October 1822, in Rockingham, Virginia, United States, his father, George Croushorn, was 24 and his mother, Catharine Byerly, was 17. He married Susan Martin Black on 24 December 1844. They were the parents of at least 5 sons and 2 daughters. He lived in Liberty Township, Highland, Ohio, United States in 1870 and Lee District, Fauquier, Virginia, United States in 1880. He died on 22 September 1911, in Oswego, Kendall, Illinois, United States, at the age of 88, and was buried in Bealeton, Fauquier, Virginia, United States.