When Alexander Marion Moon was born on 10 June 1872, in Monmouth, Polk, Oregon, United States, his father, Thomas Francis Marion "Bery" Moon, was 22 and his mother, Nancy Elizabeth Cooper, was 15. He married Jennie Belle Shortridge on 28 June 1908, in Curtis, Lewis, Washington, United States. They were the parents of at least 3 sons and 4 daughters. He lived in Boistfort, Lewis, Washington, United States for about 10 years and Boistfort Election Precinct, Lewis, Washington, United States in 1940. He died on 3 April 1958, in Chehalis, Lewis, Washington, United States, at the age of 85, and was buried in Chehalis, Lewis, Washington, United States.