"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCZB-YKX : 15 August 2017), John Allen in household of Arnold M Allen, Canton, Trigg, Kentucky, United States; citing enumeration district ED 151, sheet 364B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,443.
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M26R-7XQ : accessed 15 February 2021), John Allen, Magisterial District 6, Trigg, Kentucky, United States; citing enumeration district (ED) ED 155, sheet 11A, family 227, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 501; FHL microfilm 1,374,514.