When John Cranmer Dalton Jr. was born on 15 December 1877, in Parowan, Iron, Utah, United States, his father, John Cranmer Dalton, was 20 and his mother, Hannah Daphne Smith, was 20. He married Mary Jane Haynie on 2 May 1900, in Salt Lake City, Salt Lake, Utah, United States. He died on 25 March 1907, in Washington, District of Columbia, United States, at the age of 29, and was buried in Manassa, Conejos, Colorado, United States.