When Earl Robbins Barker was born on 30 September 1885, in Indianola, Warren, Iowa, United States, his father, Arthur Ward Barker, was 33 and his mother, Ida Emma Cheshire, was 29. He married Una Grace Moore on 23 September 1919, in Iowa, United States. They were the parents of at least 2 sons. He lived in Lincoln Township, Warren, Iowa, United States in 1900 and Warren, Iowa, United States in 1905. He died on 11 May 1976, in Indianola, Warren, Iowa, United States, at the age of 90, and was buried in Indianola, Warren, Iowa, United States.