"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFCV-CLD : 29 July 2017), Frank A Hayden in household of Levi G Hayden, Windsor, Hartford, Connecticut, United States; citing enumeration district ED 42, sheet 334B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,099.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9TP-SW9 : accessed 17 October 2020), Frank A Hayden, Somerville city Ward 6, Middlesex, Massachusetts, United States; citing enumeration district (ED) 953, sheet 4B, family 88, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,666.