When George Carl O'Neall was born on 19 June 1859, in Newton, Jasper, Iowa, United States, his father, John Belton O'Neall, was 30 and his mother, Eliza "Lida" Helm, was 21. He married Loretta Helen Olive Wiley on 14 February 1884, in Jasper, Iowa, United States. He lived in Iowa, United States in 1870. He died on 1 February 1909, in Jasper, Missouri, United States, at the age of 49.