When Montro Newton was born on 11 May 1875, in Trenton, Grundy, Missouri, United States, his father, Jasper Lafayette Newton, was 33 and his mother, Alwilda Margaret Butcher, was 26. He married Caulalda "Callie" Jane Renfro on 12 April 1896, in Buttsville, Grundy, Missouri, United States. They were the parents of at least 1 son and 1 daughter. He lived in Grundy, Missouri, United States in 1935 and Tindall, Grundy, Missouri, United States in 1940. He died on 18 August 1951, in Trenton, Grundy, Missouri, United States, at the age of 76, and was buried in Grundy, Missouri, United States.