When Oscar Donwreath Feltch was born on 19 March 1847, in Lisbon, Androscoggin, Maine, United States, his father, Cyrus Brackett Feltch, was 37 and his mother, Malvina Jane Turner, was 32. He married Isabelle Evaline Archer on 1 May 1872, in College Springs, Page, Iowa, United States. They were the parents of at least 1 son and 3 daughters. He lived in Lebo, Coffey, Kansas, United States in 1900 and Liberty Township, Ringgold, Iowa, United States in 1910. He died on 30 August 1914, at the age of 67.