Not much is known about the early life of John Barnett. He is most likely a son or grandson of the John Barnett recorded in the 1790 census of Pendleton Dist SC. This elder John is recorded just 2 entries from Isaac Steele whose daughter married John Barnett on 23 July 1812.
In 1800 Pendleton Dist, SC, Amos Barnett and John Barnett are listed on the same page as Isaac Steele when our John Barnett would have been 6 years old.
By 1840 John and Mary Jane were in old Benton Co AL where they lived the remainder of their lives surrounded by their large family. (See Mary Jane's memorial for a list of their children.)