"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MND3-K1G : 13 August 2017), John K Allen in household of Daniel L Allen, Plainfield, Union, New Jersey, United States; citing enumeration district ED 183, sheet 430C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,801.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9VQ-M5K : accessed 17 January 2021), John K Allen in household of Sarah Allen, Fanwood Town, Fanwood borough, Union, New Jersey, United States; citing enumeration district (ED) 118, sheet 2A, family 26, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,996.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QY-3MR : accessed 2 June 2016), Joseph Baumgart, Abingdon, Harford, Maryland, United States; citing sheet 8B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,675.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X48H-924 : accessed 14 November 2016), Ida C Allen in household of John K Allen, East Paterson, Bergen, New Jersey, United States; citing enumeration district (ED) ED 43, sheet 7B, line 94, family 153, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1311; FHL microfilm 2,341,046.