The 1851 Census found Mary with her family in St Stephens, Cornwall, England. [1]
Sources
↑ "England and Wales Census, 1851," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SG2Z-ZTP : 9 November 2019), Mary Truscott in household of William Truscott, St Stephens, Cornwall, England; citing St Stephens, Cornwall, England, p. 1, from "1851 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives of the UK, Kew, Surrey.
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