When Harvey Osborn Harmon was born on 26 March 1876, in Owensville, Montgomery Township, Gibson, Indiana, United States, his father, William S. Harmon, was 30 and his mother, Amanda Ellen Wiley, was 26. He married Edna Mae Wyatt on 24 December 1899, in Freeport, Banner, Nebraska, United States. They were the parents of at least 5 sons and 2 daughters. He lived in Norwalk, Los Angeles, California, United States in 1930 and Long Beach Judicial Township, Los Angeles, California, United States in 1940. He died on 21 April 1955, in Los Angeles, California, United States, at the age of 79, and was buried in Long Beach, Los Angeles, California, United States.