After the war, William F. Miller can also be found in the census records of Catahoula Parish, Louisiana which is where he filed for a Confederate Pension.
Louisiana Secretary of State
Confederate Pension Applications Index Database
Selected Name Detailed Data
Reel: CP1.98 -- Microdex 2 -- Sequence 25
Target card: MILLER, W. F.
Applicant Information & Name Variations:
MILLER, WILLIAM F.
Parish: CATAHOULA -- Pages: 13
Soldier Information & Variations:
MILLER, WILLIAM F.
State: MS
Unit: 21ST REGIMENT
Company: STAMP'S CO.
State: MS
Branch: INFANTRY
Unit: 21ST REGIMENT
Company: CO. E
(Above military data is from the War Department.)