"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ8J-T1M : 20 August 2017), Walter Geoghegan in household of John Geoghegan, Brooklyn, Kings, New York, United States; citing enumeration district ED 39, sheet 365D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,842.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSFZ-CXZ : accessed 9 July 2020), Walter Geoghegan in household of John Geoghegan, Borough of Brooklyn, Election District 6 New York City Ward 6, Kings, New York, United States; citing enumeration district (ED) 55, sheet 11A, family 199, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,044.