William O'Callahan
- Born: 12 Jul 1879, Cleveland, Cuyahoga, Ohio 1313
 Noted events in his life were:
• Census: Population Schedule, 8 Jun 1880, Cleveland, Cuyahoga, Ohio. 80 Callahan, Wm, w, m, 11/12, grandson, b. in Ohio, mother born in Ohio, father born in Ireland.
• Census, Jun 1900, Cleveland, Cuyahoga, Ohio. 950 O'Callaghan, William, son, w, m, b. May 1879, 20, s, steam fitter, born in Ohio, father born in Ireland, mother born in Ohio
• Occupation: Steam fitter, Jun 1900. 950
• Residence: 64 Whitman St., Cleveland, Ohio, Jun 1900. 950
• Residence: 3818 Whitman Ave., Cleveland, Ohio, Apr 1910. 951
• Census, 19 Apr 1910, Cleveland, Cuyahoga, Ohio. 951 O'Callaghan, William J., son, m, w, 28, s, steam fitter, born in Ohio, Father born in Ireland, mother born in Ohio
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