The following units were from Hart County, Georgia:

9th Battalion, Georgia Infantry, Company (17th Battalion) A
15th Regiment, Georgia Infantry, Company H, Pool Volunteers
16th Regiment, Georgia Infantry, Company (Sallie Twiggs Regiment) C, Hartwell Infantry
24th Regiment, Georgia Infantry, Company B
37th Regiment, Georgia Infantry, Company D, McMullan Guards
38th Regiment, Georgia Infantry, Company (Wright's Legion) F, Thornton Line Volunteers

The following units were from Madison County, Georgia:

9th Battalion, Georgia Infantry, Company (17th Battalion) B
16th Regiment, Georgia Infantry, Company (Sallie Twiggs Regiment) A,
Madison Greys
16th Regiment, Georgia Infantry, Company (Sallie Twiggs Regiment) A,
Madison County Greys
16th Regiment, Georgia Infantry, Company (Sallie Twiggs Regiment) D,
Danielsville Guards
37th Regiment, Georgia Infantry, Company E
66th Regiment, Georgia Infantry, Company I

I hope this is of assistance.

Respectfully,

Gerald D. Hodge, Jr.
M.A. Military History - Civil War Concentration
Research - Preservation
Historian: 39th Georgia Volunteer Infantry Regiment