Here's how I'd divide it up:
I think of the Knoxville Region as including: Blount, Knox, Loudon, Roane, Campbell, Claiborne, Anderson, Morgan, Scott, Jefferson, Cocke, Grainger, Union.
Leaving Hawkins, Hancock, Sullivan, Washington, Hamblen, Greene, Johnson, Carter and Uniocoi Counties in the Northeast region.
How about Sevier County??
Yeah Sevier County in the Knoxville Region, I had that originally before I edited that message (Which I don't see now). lol