Death date is based on the 1920 census being the the last one I found her entered on in Oswegatchie living with a grandson. Probable death notice.
"New York, State Death Index, 1880-1956", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QG5Z-MK9P : Sun Mar 10 04:33:36 UTC 2024), Entry for Elizabeth Townsend, 9 Aug 1921.Maltby-309 21:24, 26 April 2024 (UTC)
Find a Grave, database and images (https://www.findagrave.com/memorial/27060917/elizabeth-townsend: accessed April 27, 2024), memorial page for Elizabeth Smithers Townsend (1840–unknown), Find a Grave Memorial ID 27060917, citing Hillcrest Cemetery, Heuvelton, St. Lawrence County, New York, USA; Maintained by Anne Cady (contributor 46985237).
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