United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M371-BXN : accessed 13 May 2021), Mellie Hannigan in household of Patrick J Hannigan, Philadelphia city Ward 30, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) 773, sheet 4A, family 78, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,472.