United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSK8-SMQ : 20 January 2015), Mary Hannigan in household of Augustus Hannigan, Borough of Manhattan, Election District 219, 17 New York City Ward 24, New York County, New York, United States; citing sheet 16A, family 354, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,110.
United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M5MB-Q15 : accessed 2 May 2017), Mae A Harrigan in household of Augustine E Harrigan, Manhattan Ward 19, New York, New York, United States; citing enumeration district (ED) ED 1056, sheet 12A, family 286, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1040; FHL microfilm 1,375,053.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJBP-67S : 14 December 2015), May Hannigan in household of Augustin Hannigan, Manhattan Assembly District 15, New York, New York, United States; citing sheet 6A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,213.
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