James was born in 1815. He passed away after 1860.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M4D6-V3H : 12 April 2016), James O Connor in household of Jesse H Leavensworth, Marinette, Brown, Wisconsin, United States; citing family 15, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.). (No proof that this is the same James O'Connor but the age and location are right.)
"United States Census, 1860", : database with images, FamilySearch, 18 Jun 1860. Town of Marinette, Oconto Co, WI, p5-6. Post Office: Menekaunee (East Marinette) Currently Marinette is in Marinette Co.
James O'Connor, 42, M, Blacksmith. No value for real estate or personal estate. Ireland. Able to read and write.
Eliza O'Connor, 41, F, Ireland. Able to read and write.
Catharine O'Connor, 10, F, New York. Attended school in past year.
O M O'Connor, 8, M, Wisconsin. Attended school in past year.
Brown County, Wisconsin, marriage record. Vol 3, p 383. Wisconsin Historical Society.
Registration: January 4, 1879
Color: White
Full name of husband: John O'Shea
Full name of wife previous to marriage: Cath O'Connor
Occupation of said husband: --
Residence of said husband: Brown Co Wis
Birthplace of said husband: --
Place where the marriage was contracted: Ft Howard Brn Co
Time when the marriage was contracted: Oct 20 1868
By what ceremony contracted: Roman Cath
Name of person pronouncing marriage: F.M. Donnell
Residence of person last named: Ft Howard
Names of subscribing witnesses: Pat Finnigan, Mary Roan
Date of certificate of marriage: Church Record
Name of the father of said husband: Andrew O'Shea
Name of the mother of said husband: Mary Hurley
Name of the father of said wife: Jacob O'Connor
Name of the mother of said wife: Elis Nolan
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DNA Connections
It may be possible to confirm family relationships with James by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with James: