Andrew was born on 14 December 1804, the son of John Pritchard and Ann Fleetwood in Hackney, MIddlesex, England. He was christened on 27th Jan 1805 at Saint Botolph Aldersgate, London, England, United Kingdom and his date of birth was recorded .
Andrew married Caroline Isabella Straker on 16 July 1829 at Saint Botolph Without Aldersgate, London, London, England
Andrew Pritchard was an English naturalist and a pioneer in the application of microscopy to the fields of biology and zoology.
From 1841 until his death, it appears Andrew, his wife and children resided in Islington, Middlesex. He was listed as a land owner. 
Andrew died in 1882 at the age of 77. His death was registered in Islington, Middlesex. 
Entry in Dictionary of National Biography
PRITCHARD, ANDREW (1804–1882), microscopist, eldest son of John Pritchard of Hackney, and his wife Ann, daughter of John Fleetwood, was born in London on 14 Dec. 1804. He was educated at St. Saviour's grammar school, Southwark, and was afterwards apprenticed to his cousin, Cornelius Varley, a patent agent and brother to John Varley [q. v.], the artist. On the expiration of his apprenticeship he started in business as an optician, first at 18 Picket Street, then at 312 Strand, and afterwards at 162 Fleet Street. He retired from business about 1852, and died at Highbury on 24 Nov. 1882. He married, on 16 July 1829, Caroline Isabella Straker.
Brought up with the ‘independents,’ Pritchard later in life associated with, though he never actually became a member of, the sect known as Sandemanians, and it was in connection with that body he first made the acquaintance of Faraday. He finally became a unitarian, and in 1840 joined the congregation at Newington Green, a connection which lasted throughout his life. He was greatly interested in all the institutions connected therewith, and was treasurer of the chapel from 1850 to 1872.
↑ "England and Wales Census, 1851," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SGB1-59Q : 12 September 2019), Andrew Pritchard, Islington, Middlesex, England; citing Islington, Middlesex, England, p. 2, 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.
↑ "England and Wales Census, 1881," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q279-NBNW : 8 December 2017), Andrew Pritchard, Islington, London,Middlesex, England; from "1881 England, Scotland and Wales Census," database and images, findmypast (http://www.findmypast.com : n.d.); citing p. 23, Piece/Folio 255/78, The National Archives, Kew, Surrey; FHL microfilm 101,774,224.
↑ England & Wales General Register Office, GRO Online Index - Death (https://www.gro.gov.uk/gro/content/ : accessed 31 July 2021), database entry for Pritchard, Andrew. Age at death: 77. GRO Reference: 1882 D Quarter in Islington, Volume 01B Page 261.