Mary was born about 1817 in River Street, Congleton, Cheshire, England, the daughter of Thomas Hersfield and Harriet.
Her husband was John Washington, who she married in ABT 1840. The place has not been found. Their nine known children were Harriet (c1841-?), Thomas (c1844-?), Sarah (c1847-?), James (1850-1929), John (c1852-?), Henry (c1855-?), Jane (c1857-?), Martha (c1860-?) and Mary (1862-?).
!Source: 1861 Census.