Union Co. was also part of Grainger Co. at one time. Grainger part of Jefferson or Hamblen? The boundries for so many of these counties changed so many times that is is most difficult to keep up with who was living where and most likely no one ever left their orig. homes in the first place! See this URL for "some" boundry lines.....in East TN. < http://www.rootsweb.com/~tnunion/index.htm >