Mary was born about 1873. On the 1910 census her birth location is listed as "Columbia, Pa.".
Sources
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M53V-9C3 : accessed 11 August 2018), Mary Hoffa in household of Frederick Hoffa, Manhattan Ward 12, New York, New York, United States; citing enumeration district (ED) ED 499, sheet 2B, family 43, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1020; FHL microfilm 1,375,033.
"New York State Census, 1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K92C-9N1 : 8 November 2014), Mary Hoffa, New York, New York, New York, United States; from "New York, State Census, 1915," database and images, Ancestry (http://www.ancestry.com : 2012); citing p. 39, line 34, state population census schedules, 1915, New York State Archives, Albany.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJ1Z-CPY : accessed 11 August 2018), Mary Hoffa in household of Frank Hoffa, Manhattan Assembly District 19, New York, New York, United States; citing ED 1334, sheet 9A, line 39, family 224, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1221; FHL microfilm 1,821,221.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X45W-QHF : accessed 11 August 2018), Mary K Hoffa in household of Frederick Hoffa, Queens (Districts 0251-0500), Queens, New York, United States; citing enumeration district (ED) ED 390, sheet 6A, line 32, family 75, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1600; FHL microfilm 2,341,335.
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