Mary was born in Ireland about 1817. The following profile from Familysearch.org lists her husband as William Cotter.[1]
Sources
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZFF-YGW : 13 September 2017), Mary Cotter in household of William Cotter, Brasher, St Lawrence, New York, United States; citing enumeration district ED 191, sheet 44D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,925.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSGM-3YN : accessed 25 November 2020), Mary Cotter in household of Henry Lashomb, Brasher Township, Election District 2 Brasher, St. Lawrence, New York, United States; citing enumeration district (ED) 77, sheet 7B, family 172, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,156.
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