He was born in 1810/21, in Ireland.
date: 3 (40 in 1861), 8 (60 in 1870).
place: 8, 10]
When he enlisted, he was living in Philadelphia.
During the war
He enlisted and was mustered into service on 23 or 24 October 1861.
He enlisted at Philadelphia, Pennsylvania.
He was a private in company H.
[sources: 1 (co.D: 24 Oct, co.H: 23 Oct), 3 (23 Oct), 4 (23 Oct), 11]
On 28 February 1863, he successfully applied for a pension.
[sources: 5, 6]
Perhaps he is the William Anderson who married Jane McClain on 3 October 1864, in Philadelphia, Pennsylvania.
In 1869 and 1870, William Anderson was living at 1218 Brinton Street, Philadelphia, Pennsylvania.
He was a weaver.
Perhaps he is the William Anderson living in ward 4, Philadelphia, Pennsylvania, in 1870.
He was living with Jane (perhaps his wife?).
He was a weaver.
Perhaps he is the William Anderson who died on 14 August 1871, at 1218 Brinton Street, ward 4, Philadelphia, Pennsylvania.
He was married, and was a weaver.
He died of inflammation of the lungs.
He was buried on 16 August 1871, at the M[ethodist] E[piscopal] Union Cemetery.
William Anderson continues to be listed as a weaver living at 1218 Brinton Street in the Philadelphia directories through 1874.
Perhaps his widow is the Jane Anderson, widow of William, living at 1120 Thurlow, in 1876 and 1877.
On 23 January 1885, his widow, Jane Anderson, successfully applied for a pension from Pennsylvania.
[sources: 5, 6]
Perhaps his widow is the Jane Anderson, widow of William, living at 1105 McIlravy Street, Philadelphia, Pennsylvania, in 1888.
(Note that a James Cooper, engineer, was also living there.)
Perhaps his widow is the Jane Anderson, widow of William, living at 1208 Fulton Street, Philadelphia, Pennsylvania, in 1890.
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)
Perhaps the fact that I have not found a candidate for William married to Jane in the 1860 census suggests that the William who married Jane McClain in 1864 is the William who served in the 91st.
(The pension certificate file would, of course, confirm or disconfirm this guess.)
If so, the fact that one William and Jane appear in the 1870 census, and I have not found a couple who could be them in the 1880 census, may suggest that he died between 1870 and 1880 (a bit earlier than her applying for a pension in 1885 would suggest).
The only plausible candidate I have found in the Philadelphia death certificates (see Philadelphia Pennsylvania death certificates below) is the William Anderson who died on 14 August 1871.
This is all very speculative; absence of candidates in the indices is not great evidence.
But since it fits, I have tentatively summarized it above.
the FamilySearch and Ancestry indices (accessed 25 June 2012) have no William Anderson's born 1805-1825 living in Philadelphia
1860 US census
the FamilySearch index (accessed 15 June 2012) lists three William Anderson's in Philadelphia born 1820-21
(1) in ward 17, eastern part, film 1167, page 618 = 115 handwritten: Wm Anderson, 40, born Ireland, weaver, with Mary Anderson, 30, born Scotland
(2) in ward 3, west of 5th street, film 1153, page 447 = 223 handwritten: Wm Anderson 39 laborer born Ireland, with Esther 36 born Ireland, Mary J 11 born Philadelphia, Esther 8 born Philadelphia, and Mary 6 born Philadelphia
(3) in ward 4, western division, film 1154, page 985 = 179 handwritten: Wm Anderson, 40, born Delaware, 44, white washer, with Amelia (39 [?] b. PA)
using the Ancestry index (accessed 25 June 2012), I did not find any William and Jane Anderson's in Philadelphia
the FamilySearch index (accessed 25 June 2012) has no William Anderson's living in Philadelphia born 1805-1815
1880 US census
Ancestry's index has two William Anderson's married to Jane living in Pennsylvania born in 1821 +/- 10 years:
William Anderson, 54, b. PA, physician, with Jane (48) and Mary R (22), living in Indiana Borough, Indiana, PA (s.d.8, e.d. 127, microfilm series T9, film 1135, page 8 = 15 C handwritten)
William S Anderson, 70, miller, b. PA, with Eliza J (49 b. PA) et al., living in Wells Township, Fulton County, PA (s.d.7, e.d. 207, microfilm series T9, film 1133, page 6 = 11 C handwritten)
the HeritageQuest head of household index has 16 Jane Anderson's living in Philadelphia in 1880; 11 are more than 20 years old (and 10 more than 30): one is 58 and born in Ireland, living at 1947 Blair St, ward 31, with John (85 puddler b. Ireland) and Fannie (20 weaver b. PA) Anderson (s.d.1 e.d. 667 microfilm series T9, film 1189, page 2351 = 13 A handwritten)]
1890 veterans schedules
Jane widow of William Anderson G 58 PA Inf 8 July 63 to 15 Aug 1863 in Marshal, Allegheny, PA (Thom Hile)
no other Jane in PA; one Jannie R in Northampton but widow of Peter
1900 US census
search FamilySearch for Jane Anderson living in Philadelphia born 1800-1845 yielded 11 results (accessed 26 June 2012)
1910 US census
search FamilySearch for Jane Anderson living in Philadelphia born 1800-1845 yielded 3 results (accessed 26 June 2012)
1920 US census
search FamilySearch for Jane Anderson living in Philadelphia born 1800-1845 yielded 0 results (but 456 living anywhere in the US) (accessed 26 June 2012)
1930 US census
search FamilySearch for Jane Anderson born 1800-1845 yielded 147 results (accessed 26 June 2012)
searched for William Anderson December 1884 to January 1885, Philadelphia newspapers (23 June 2012) found one entry: death notice, Philadelphia Inquirer 27 December 1884, page 4 (see also FS):
"ANDERSON.--On the 22d inst., WILLIAM ANDERSON, aged seventy-five years. The relatives and friends, also Harmony Lodge, No.20, A.P.A., are respectfully invited to attend the funeral, this afternoon, at 1 o'clock, from the residence of his son-in-law, George Peterman, No. 1008 Lawrence street. Services at Kensington Presbyterian Church, Frankford avenue, above Girard avenue. To proceed to Hanover Street Vault."
no death notices in the Philadelphia Inquirer or Public Ledger on 14 to 16 August 1871 (accessed 26 June 2012)
Pennsylvania veterans burial records
Ancestry index (accessed 2 April 2012) has 130 William Anderson's--I did not check them all. many had no date of death. I checked all with plausible dates of death, and those with no date of death, some of which had no service information (but none in Philadelphia or the surrounding counties)
Records of headstones of deceased Union volunteers, 1879-1903
FamilySearch index (accessed 26 June 2012)
Applications for headstones for military veterans, 1925-1941
(7) William Anderson, 58 (born ca 1813) born Ireland, married, weaver, died 14 Aug 1871 1218 Brenton St, Philadelphia, buried ME Union, 16 August 1871
(8) [apparently the death register entry for the death certificate in (7)]
(9) William Anderson, 58 (born ca 1817), born Philadelphia, colored, married, whitewasher, died 26 April 1875, of congestion of lungs, 1012 Locust St (8th ward) Philadelphia, buried Lebanon 29 April 1875
(10) Wm B Anderson, 57 (born ca 1819), born NJ, white, blind maker, died 15 Feb 1876 of dropsy at 1224 North 2nd St (ward 17) Philadelphia, buried 18 Feb 1876 Hanover St Vault
(11) Wm Anderson, 50 (born ca 1822), single, white, died 11 June 1872 of injuries received, Philadelphia (the undertaker's certificate is not filled out)
searched for William Anderson born 1820 +/-5 died 1870 +/- 10 married Jane; William Anderson born 1810 +/- 5 died 1870 +/- 10 married Jane (accessed 25 June 2012)
[Church of the Redemption [Episcopal, Philadelphia, PA] marriage records, in Historic Pennsylvania church and town records, Historical Society of Pennsylvania, reel 230]
[transcribed June 2012 from Pennsylvania church and town records, on Ancestry (image 83 of 467)]
[Ancestry's database has 3 other marriages of a William Anderson to Jane, in Montgomery County (12 Nov 1948), Franklin (Jan 1864), and Cumberland (27 Feb 1812); the Franklin county marriage is William W Anderson to Jane S Hill on 31 Jan 1864]
[identification is speculative; see note on identification above]
Octr 3rd , William Anderson to Jane McClain both of this city -- A.
[1870 US census, Pennsylvania, Philadelphia, ward 4, district 13, microfilm series M593, film 1390, page 195 recto = 27 handwritten]
[identification is speculative; I have no other candidates, and have not found this couple in the 1860 or 1880 censuses, but have no other information suggesting that this William is the William Anderson who served in the 91st--see the note on identification above]
Real estate value
Personal estate value
Father foreign born
Mother foreign born
Birth month if born within year
Marriage month if married within year
Attended school past year
Deaf, dumb, blind, etc.
Male US citizen at least 21 years old
Male US citizen at least 21 years old who can't vote ...
[death certificate, Philadelphia, Pennsylvania, 14 August 1871, William Anderson]
[identification is speculative; this is likely the William Anderson in the 1870 census entry transcribed above, but I do not know whether that is the William Anderson who served in the 91st--see the note on identification above]
[transcribed 25 June 2012, from FamilySearch]
RETURN OF A DEATH
IN THE CITY OF PHILADELPHIA.
1. Name of Deceased, William Anderson
2. Color, White
3. Sex, Male
4. Age, Fiftyeight years
6. Date of Death, 14th Inst.
7. Cause of Death, Inflammation of the Lungs
A. H. Graham M.D.
Residence, 1332 Lombard St
UNDERTAKER'S CERTIFICATE IN RELATION TO DECEASED.
8. Occupation, Weaver
9. Place of Birth, Ireland
10. When a Minor, [blank]
11. Ward, 4th
12. Street and Number, 1218 Brinton St
13. Date of Burial, August 16th 1871
14. Place of Burial, M E Union
A E Green [?] Undertaker.
Residence, 1336 South St