When George Duncan Howard was born in 1786, in North Carolina, United States, his father, Robert Sims Howard, was 24 and his mother, Nancy Van Bibber, was 27. He married Jane Witt on 24 June 1835, in White, Tennessee, United States. They were the parents of at least 1 daughter. He lived in Tennessee, United States in 1870. He died on 13 April 1873, in White, Tennessee, United States, at the age of 87, and was buried in Anderson Cemetery, White, Tennessee, United States.