When Charles McCellan Letteer was born on 10 April 1891, in Cambra, Huntington Township, Luzerne, Pennsylvania, United States, his father, Joseph Fairbanks Letteer, was 25 and his mother, Addie Mariah Michaels, was 18. He married Mable Jennie Klinger from 1911 to 1936. They were the parents of at least 3 sons and 1 daughter. He lived in Salem Township, Luzerne, Pennsylvania, United States in 1900 and Benton, Columbia, Pennsylvania, United States in 1920. He died on 18 November 1964, in Columbia, Pennsylvania, United States, at the age of 73.