In the 1860 U.S. Census for Erie County, Mary Walsh, born in Ireland, and age 23, is a domestic servant working for Mr. William Mills, a land broker. The family unit listed right before the Mills family is that of John Quinn. The elder John Quinn was born in Ireland. Several persons are in the same household, including a younger John Quinn, age 20, who was also born in Ireland.
It appears that sometime after 1860, John Quinn and Mary A. Walsh were married. Sadly, on February 27, 1866, Mary A. Walsh Quinn died. Her tombstone has a cross at the top of the stone, with the words: In Memory of Mary A. Walsh, wife of John Quinn. Mrs. Quinn is buried in the St. Joseph Catholic Cemetery in Sandusky, Ohio.