RM:
Some Roman Catholic records for the period 1804 to 1883 are on microfilm available from an LDS Family History Center. The number, I believe, is 0979712
Tallanstown
Baptisms
Nov 9 1817 - Apr 13 1825
Sept 25 1830 - Nov 6 1835
l Nov 9 1835 - Sept 28 1875
Oct 12 1875 - Dec 27 1880
Marriages
Apr 4 1804 - Mar 16 1816
Apr 17 1816 - June 1 1863
Aug 31 1867 - Nov 25 1880 LDS Family history library British Film Area 0979712 item 4- 9
From Samuel Lewis Topigraphical Dictionary 1837
TALLANSTOWN, a parish, in the barony of ARDEE, county of LOUTH, and province of LEINSTER, 7 miles (W.S.W.) from Dundalk, on the road from Drogheda to Monaghan, and on the river Glyde; containing 1074 inhabitants, of which number, 60 are in the village. The parish, according to the Ordnance survey, comprises 3210¼ statute acres: the soil is in general good, and agriculture has greatly advanced, the resident gentry and farmers having exerted themselves to introduce the improved system both in the cultivation of land and in the rearing of cattle. The principal seats are Lisreigny, that of W. Filgate, Esq., a handsome residence in an extensive and well-planted demesne, and the grounds and hedge-rows are exceedingly well kept; Arthurstown, of T. W. Filgate, Esq., also a handsome residence; and Louth Hall, of Lord Louth, a spacious castellated mansion, in a demesne of about 250 acres, which are well planted; on this estate are 700 acres of the best land in Ireland, under tillage. It is a vicarage, in the diocese of Armagh, forming part of the union of Charlestown or Philipstown; the rectory is impropriate in the Hon. J. Leslie Foster, third Baron of the Exchequer. The tithes amount to £260. 3. 8., of which £215. 13. 8. is payable to the impropriator, and £44.10. to the vicar. In the R.C. divisions the parish is the head of a union or district, comprising the parishes of Tallanstown, Charlestown, Philipstown, Clonkeen, and Clonkeehan, in which union are two chapels, one in Tallanstown, the other at Reastown in Philipstown. A school for female children was built by T. W. Filgate, Esq., in his demesne at Arthurstown, and is supported by Mrs. and Miss Filgate; there is also a school at Lisreigny: in these schools about 80 children are taught.
http://www.jbhall.freeservers.com/lewis_parsonstown_to_tullyallen.htmHope this is of some help.
Good luck.
Pat