"England and Wales Census, 1841," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M7M2-C3Z : 23 May 2019), Mary Hallows in household of Peter Hallows, Tarvin, Cheshire, England, United Kingdom; from "1841 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives, Kew, Surrey.
GRO: 1853 Dec Burkhill Thomas / Hallows Mary Gt Boughton 8a 495
"England, Cheshire Parish Registers, 1538-2000," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F3F6-XQ9 : 7 December 2017), Thomas Burkhill and Mary Hallows, 03 Oct 1853, Marriage; citing item 4 p 41, St John, Chester, Cheshire, England, Record Office, Chester; FHL microfilm 2,045,952.
Census 1861: RG9/2631/26/19/119
"England and Wales Census, 1871", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VBF5-SR9 : 17 November 2020), Mary Burkhill in entry for Thomas Burkhill, 1871.
Census 1881: RG11/2560/85/19/86
"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:4SHT-R6Z : 5 May 2019), Mary Burkhill in household of Thomas Burkhill, Chester, Cheshire, England, United Kingdom; from "1891 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 12, Cheshire county, subdistrict, The National Archives of the UK, Kew, Surrey.
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSX9-FLS : 21 May 2019), Mark Burkhill in household of Henry A Clegg, Upton, Cheshire, England, United Kingdom; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Chester Cathedral subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
GRO: 1904 Dec Burkhill Mary 80 Chester 8a 302
Find a Grave, database and images (https://www.findagrave.com : accessed 20 December 2020), memorial page for Mary Hallows Burkhill (1823–25 Dec 1904), Find a Grave Memorial no. 191504441, citing Overleigh Cemetery, Chester, Cheshire West and Chester Unitary Authority, Cheshire, England ; Maintained by Chris Kemp (contributor 47865401) .