On 4 September 1842, William Maccordock was Baptized in the Clooncare Church of Ireland parish, County Leitrim, Church of Ireland. Father Joseph Maccordock and mother Barbara (maiden name not recorded), address Ballyboy. [Church of Ireland, Church Baptism Records.]

In 1870, William McCordick and Susan McCordick were married in Manhattan, New York County, New York. [Certificate of Marriage 7784, as abstracted in http://freepages.genealogy.rootsweb.com/~blkyn/Marriage/M/M.12.html.]

1874 Baltimore City Directory, page 378:
McCordick Wm. porter, Jefferson nr Chase

1875 Baltimore City Directory, page 383:
McCordick Wm. porter, 312 n Durham

On 14 April 1875, a child was born at 312 Durham Street in Baltimore City, Maryland. The child was the 2nd or 3rd of the mother’s (the certificate was filmed out of focus), was male and white. The mother was Susan McCordock, whose maiden name was also McCordock, born in Ireland. The father was William McCordock, a porter, born in Ireland. The medical attendant was Mary A. Allwell of 279[?] N.[?] Gough[?] Street. [Baltimore City, Maryland, Certificate of Birth 2354.]

1876 Baltimore City Directory:
McCordick Wm. porter, 288 n Durham [page 415]

The 1877 Polk’s Baltimore City Directory lists on page 447:
McCordick Wm. porter, 284 n Durham

The 1878 Polk’s Baltimore City Directory lists on page 522:
McCordick Wm. porter, 284 n Durham

The 1879 Polk’s Baltimore City Directory lists on page 502:
McCordick Wm. porter, 88 s Wolfe

1880 U.S. Census, Baltimore City, Maryland
Enumeration District 14, Page 25
Enumerated on 5 June 1880
37 North Wolfe Street
Dwelling 178, Household 225
McCordick, William, white, male, age 35, married, clerk in store, born in Ireland, both parents born in Ireland
McCordick, Susan, white, female, age 35, wife, married, keeping house, born in Ireland, both parents born in Ireland
McCordick, Ann, white, female, age 7, daughter, single, at school, in school within the past year, born in Maryland, both parents born in Ireland
McCordick, William, white, male, age 5, son, single, born in Maryland, both parents born in Ireland

The 1880 Polk’s Baltimore City Directory lists on page 522:
McCordick Wm. porter, 37 n Wolfe

The 1881 Polk’s Baltimore City Directory lists on page 561:
McCordick Wm. porter, 37 n Wolfe

The 1882 Polk’s Baltimore City Directory lists on page 838:
McCordick Wm, porter, 37 n Wolfe

The 1883 Polk’s Baltimore City Directory lists on page 662:
McCordick Wm, porter, 48 Courtland

The 1884 Polk’s Baltimore City Directory lists on page 774:
McCordick Wm T, porter, 324 Orleans

The 1885 Polk’s Baltimore City Directory lists on page 838:
McCordick Wm T, porter, h 365 e Fayette

The 1886 Polk’s Baltimore City Directory lists on page 886:
McCordick Wm., porter, 365 e Fayette

On 25 September 1886, a child was born at 365 E. Fayette Street in Baltimore City, Maryland. The child was male, the fourth child of Susan McCardock, whose maiden name was also McCardock and who was born in Ireland. The afther was Wm McCardock, a clerk, born in Ireland. The medical attendant was Mary A. Allwell of 262 McDonough Street. [Baltimore City, Maryland, Certificate of Birth 88946.]

McCORDICK.—On Sunday evening, November 14, at 6:35, WILLIAM McCORDICK, in the 41st year of his age. Friends and relatives are requested to attend his funeral from Chester-street M.E. Church, on Wednesday afternoon, November 17, at two o’clock. [The (Baltimore) Sun, 16 November 1886, page 2.]

McCORDICK.—On Sunday evening, November 14, at 6:35, WILLIAM McCORDICK, in the 41st year of his age. Friends and relatives are requested to attend his funeral, from Chester-street M.E. Church, on this (Wednesday) afternoon, November 17, at two o’clk. [The (Baltimore) Sun, 17 November 1886, page 2.]

A microfiled copy of William McCordick’s death record is extremely faint. The date of death is not legible. No age was filled in, but he is listed as white. Died of typhoid fever. Buried in Baltimore Cemetery on 17 November 1886. [Baltimore City, Maryland, Certificate of Death 96099.]

The 1887 Polk’s Baltimore City Directory lists on page 787:
McCordick Wm T, salesman, 1831 e Fayette 365 [365 old address]