Jason Jr., was the son of Jason, Sr. and his first wife, probably Fannie Elizabeth Rayburn; (married 2nd wife Mary Miller Matlock 1807.) Jason, Jr. was married to Elizabeth 'Betsy' Hicks, daughter of Isaac and Elizabeth Hicks. They were said to be parents of at least twenty children, but no one seems to have an accurate list of all of them.

Uncle Billy Harrison in his oral history records says 'some of their children' are Melinda married Jesse Coleman; Mary, Candace (Selvidge), Alex married Annie Rogers; Elizabeth 'Betty married Calvin Coleman; Moses married Rachel; Isaac, Absolom married Nancy Ann Duggan; James married Catharine Campbell; Walter, Moses H. married Nancy; Manerva married David Young and went to Parker County, Texas; Minnie, Abraham Haun married Rebecca Fields; Solomon died 1861 at Lynchburg, Virginia in 1861 of TB during the Civil War.

In the files of the Polk County Historical & Genealogical Society are letters from different Matlock descendants in Texas, and a granddaughter of Minerva Matlock Young states that she knew Manerva well and she said she had four brothers also living in Texas, Moore, James, Walter and John.

Ocoee Baptist Church was formed the 13th of August 1836, and Elder Jason Matlock was selected to serve as the first pastor. He had previously been active in the Sweetwater Association, having served three years as moderator and delivered the sermon on several occasions. There was a doctrinal dispute over missionary work which split Ocoee church, with Jason being anti missions and Zachriah Rose being a strong advocate of missions. The rift was healed in 1855.

Jason was one of the signers of the petition to form Polk County from Bradley and McMinn.

The will of Jason, Jr. was written March 1875 and probated in the April 1880 term of court. It only names two children, Abraham, to whom practically everything, land and goods, was given. The only exception was that a 'bedstead and bedclothes' went to his daughter, Elizabeth Coleman. Jason says that his son 'has remained with me in my old age and has taken care of me and his mother with great kindness."

The Matlock name will long be remembered in Polk County, and a little one room log schoolhouse and cemetery bore his name.