Useful Sources for St Mary's

The most useful place to start is the census of 1901 and 1911 at http://www.census.nationalarchives.ie/ and search under various headings including entering the parish name under the DED section.

Griffiths Valuation gives information on tenants and landlords in the mid 1850's post famine.

Griffiths Valuation of Ireland - St. Peters, County Louth

Failte Romhat site gives the Flax growers list of 1796 and other information and is privately maintained.

http://www.failteromhat.com/griffiths/louth/stpeters.htm

or try http://www.askaboutireland.ie/griffith-valuation/ which also has a map section.

After that the tithe applottment books are available at http://titheapplotmentbooks.nationalarchives.ie/search/tab/home.jsp These record those who were to pay a church tax from 1823 to 1837 but show only the single person for those owning above 1 acre of land.

For detailed information on County Louth Genealogy this excellent site is free and I acknowledge Brendan Hall for his work in doing this and assistance since. This information is sourced from many areas such as military records and commercial data.

See http://www.jbhall.freeservers.com/ which has data back to the 17th century.