In 1915, Harriet was 70 years old and lived with her daughter Gertrude and her family in Caroga, NY.
In 1920, Harriet was 74 years old and lived with her son James and his family in Montgomery, NY.
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Sources
"New York State Census, 1865," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVNN-S4P3 : 8 March 2021), Hariett Leavensworth in household of Sylvester Leavensworth, District 01, Sand Lake, Rensselaer, New York, United States; citing Census, p. 23, citing multiple county Clerks; Warren and Lewis County Board of Supervisors; multiple counties in New York; Utica and East Hampton Public Libraries, New York.
"New York State Census, 1875," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VNJG-Y8C : 18 February 2021), Harriet M Leavensworth in household of Lester Leavensworth, New Lebanon, Columbia, New York, United States; citing p. 35, line 3, State Library, Albany; FHL microfilm 479,102.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ8C-Z24 : 19 February 2021), Hariete Leanworth in household of Sylvester Leanworth, Arietta, Hamilton, New York, United States; citing enumeration district ED 17, sheet 390B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,837.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSXT-4BD : accessed 31 March 2015), Harriett E Leavensworth in household of Sylvester Leavensworth, Caroga Township, Fulton, New York, United States; citing sheet 4A, family 74, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,036.