When William Marion Creason was born on 12 June 1870, in Neosho Township, Cherokee, Kansas, United States, his father, David Willis Creason, was 23 and his mother, Sarah Desdemona Garrett, was 23. He married Rowena Elizabeth Russell in 1903, in Gunnison, Gunnison, Colorado, United States. They were the parents of at least 1 son. He lived in La Jara, Conejos, Colorado, United States in 1880 and Conejos, Colorado, United States in 1910. He died on 28 May 1916, in Monte Vista, Rio Grande, Colorado, United States, at the age of 45, and was buried in Monte Vista, Rio Grande, Colorado, United States.