Dan,
By now you've probably found much more about your ancestors, John and Mary Coxhead of England, Ireland and Philadelphia.
In case this will help other researchers, the Philadelphia Death Certificate Index includes this information about John:
Name: John Coxhead
Age at Death: 38 (born abt 1851)
Death Date: 25 Jan 1889
Death Place: Philadelphia
Born: England
Marital Status: Married
Occupation: Coachman
Residence: Philadelphia, Pennsylvania
Burial Date: 28 Jan 1889
Cemetery: Mount Moriah
(and more)
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Pennsylvania, Church and Town Records, 1708-1985, gives a church name whose records you should research for more on John and Mary -- perhaps you'd find their marriage, Mary's maiden name, and their children's births/baptisms:
Name: John Coxhead
Event Type: Burial
Burial Date: 25 Jan 1889
Burial Place: Philadelphia, Philadelphia, Pennsylvania
Organization Name: Trinity Episcopal Church
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The 1880 census shows John living and working in Philadelphia:
John Coxhead - 24 (born abt 1856) - Single - born England - parents born England - Occupation: Coachman
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And I think this was John's birth in England, to parents John and Mary Coxhead:
England & Wales Birth Index, 1837-1915
Name: John Coxhead
Date of Registration: Oct-Nov-Dec 1850
Registration District: St George Hanover Square
Inferred County: London
Volume 1, Page 34
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The 1851 census in England shows this couple with children including son John.
1851 England census, Civil Parish: St George Hanover Square
Ecclesiastical parish: St Mark, County: Middlesex
John Coxhead 47
Mary Ann Coxhead 43
Caroline Coxhead 22
Ellen Coxhead 18
Emily Coxhead 13
James Coxhead 11
Louisa Coxhead 8
Charles Coxhead 4
John Coxhead 6 Mo. - born Westminster, Middlesex, England
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There's much more to be found on these Coxheads in English records.
Also, are you still researching your ancestor William James Hadden of Co. Tyrone, Ireland, and Philadelphia? You should get in touch with descendant Jenna Eicherly who is also very interested in this family. I've added a lot to my outline of that Hadden branch and am always glad to share research notes.
Annie
anniecrenshaw@centurytel.net