When John Wesley Hartman was born in 1822, in Somerset, Pennsylvania, United States, his father, David Hartman Sr, was 32 and his mother, Agnes Nancy Trout, was 40. He married Sarah Schlosser on 5 April 1845, in Henry Township, Fulton, Indiana, United States. They were the parents of at least 6 sons and 3 daughters. He lived in Pleasant Township, Van Wert, Ohio, United States in 1863 and Henry Township, Fulton, Indiana, United States for about 10 years. He died on 29 December 1897, in Athens, Henry Township, Fulton, Indiana, United States, at the age of 75, and was buried in Mount Hope Athens Cemetery, Athens, Henry Township, Fulton, Indiana, United States.