Mr. Davis,
You need to look at "Tennesseans in the Civil War, Volume 1". This book contains capsule histories of Tennessee regiments and has company/regimental list broken down by county of origin.
Please let me know if you have any questions.
Respectfully,
Gerald D. Hodge, Jr.
War Between the States Historian
Historian: 39th Georgia Volunteer Infantry Regiment
http://39thgavolinfrgt.homestead.com/39thHomepage.html