When William Manthus Harl was born on 18 April 1883, in Daviess, Kentucky, United States, his father, Thomas Hodge Harl, was 28 and his mother, Eliza Ann Alvey, was 24. He married Melinda Mary Bohns on 26 December 1905, in Owensboro, Daviess, Kentucky, United States. They were the parents of at least 1 son and 2 daughters. He lived in Magisterial District 5 Vanover, Daviess, Kentucky, United States in 1900. He died on 1 January 1953, in Tulsa, Tulsa, Oklahoma, United States, at the age of 69, and was buried in Tulsa, Tulsa, Oklahoma, United States.