John married Mary Craggs in Pontefract, West Yorkshire, on 31 March 1819.
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↑ Estimated based on the fact that he was married in 1819.
↑ "England Marriages, 1538–1973 ," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/NFWQ-49M : accessed 25 March 2015), John Jackson and Mary Craggs, 31 Mar 1819; citing Pontefract, West Yorkshire, England, reference Roll 30 P.29 R.86; FHL microfilm 1,542,097.