He was born in 1824/25 (3 [38, probably when he reenlisted], 9 [48 at death in 1874]). He was born in Philadelphia, Pennsylvania (3, 9).
When he enlisted, he was 6 feet 0 inches tall, and had a dark complexion, black eyes, and black hair (3).
He enlisted and was mustered into service on 2 September 1861 (1, 3, 4). He was enlisted for three years, at Philadelphia, Pennsylvania, by Captain Starr (3). He was a private in company C (1, 10).
On 8 September 1863, Sinex reported that he was in Philadelphia and able to rejoin the regiment, and requested his return (2).
He reenlisted as a veteran volunteer (1).
He was wounded on 18 June 1864 at Petersburg Virginia (1).
He mustered out on 10 July 1865 with his company (1, 4). He was a private, in company C (10).
On 9 July 1872, he applied successfully for a pension (6, 8).
He died on 8 November 1874, of exhaustion (9). He died at, or was buried from, 515 St John Street, Philadelphia, Pennsylvania (9). He was married (9). He was a tailor (9). He was buried on 12 November 1874, at American Mechanics Cemetery (9). He was buried in West Laurel Hill Cemetery, Bala Cynwyd, Montgomery County, Pennsylvania (7).
On 2 [?] January 1875, his widow, Mary J Graham, applied successfully for a pension (6, 8).
In 1890, his widow, Mary J Graham, was living at 515 St John Street, Philadelphia, Pennsylvania (4, 5). Also living there were Samuel A Graham, William P Graham, and John W May (5).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster)
2 letter, Sinex to Marvin, 8 September 1863
3 company C, descriptive roll, entry 35 (William P Graham)
4 1890 US census, veterans schedule, Pennsylvania, Philadelphia, Philadelphia, supervisor's district [1], enumeration district [203], page [2], line 20 (image 1299 on Ancestry) (William P Graham)
5 1890 Gopsill's Philadelphia directory (William Graham)
6 pension index, by name (William P Graham)
7 West Laurel Hill Cemetery (William Graham)
8 pension index, by regiment, 91st PA Infantry, company C (William P Graham)
9 death certificate, Philadelphia, Pennsylvania, William P Graham, 8 November 1874 (William P Graham)
10 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (William P Graham)