When Marshall Delmar Morrill was born on 27 February 1862, in Byron Township, Kent, Michigan, United States, his father, Thomas A. Morrill, was 33 and his mother, Jane E. White, was 26. He married Gertrude Eliza Phelps on 3 March 1886, in Hocking, Ohio, United States. They were the parents of at least 3 daughters. He lived in Georgetown Township, Ottawa, Michigan, United States in 1910 and Cannon Township, Kent, Michigan, United States in 1930. He died on 13 February 1940, in Grand Rapids, Kent, Michigan, United States, at the age of 77, and was buried in Rest Lawn Cemetery, Grand Rapids, Kent, Michigan, United States.