"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MWJP-PXM : 29 December 2021), Dennis Maloney in household of John Maloney, Philadelphia, Philadelphia, Pennsylvania, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .