The Parish Registers for the Parish Church of St. Mary for the periods:-
- Baptisms - 1653-1941
- Marriages - 1653-1970
- Burials - 1653-1947
- Bishop's Transcripts - 1604-1869
are deposited at Hertfordshire Record Office, County Hall, Hertford, SG13 8DE. [D/P37]
Entries from the Marriage Registers for the period 1653-1837 are included in The Allen Index at Hertfordshire Record Office.
The period 1653-1849 is covered by the IGI.
Transcripts of the parish registers for the period 1604-1954 are deposited at the Society of Genealogists, 14 Charterhouse Buildings, Goswell Road, LONDON, EC1M 7BA.
The following records for churches in the ancient parish of Essendon are also available at Hertfordshire Record Office, County Hall, Hertford, SG13 8DE.:-
- Woodhill St. Mark [D/P37] -
- Baptisms - 1855-1975
- Marriages - 1927-1975
- Burials - 1855-1902
- Bishop's Transcripts - 1855-1869
see also Bayford