Irish civil registrations records aren't computerised or available online. There are no surviving census records before 1901 and 1911 and neither as yet is computerised or available online. There are no county wide records in County Westmeath computerised or available online. There are no computerised church records or church records online.
For anyone born after civil registration started in Ireland in 1864 and for whom you have specific dates of birth, parents names and places of birth you can order the civil birth certs from the General Register Office at http://www.groireland.ie
and click on "apply for cert".
For anyone born after civil registration and for whom you don't have the detailed information you can order the microfilmed Index of Irish Civil Registrations records on order through a LDS Family History Centre and search the microfilms for the birth entries in the index. With the index information you can then order the detailed birth certs from the General Register Office. Civil registration records are all in date order.
Castlepollard RC parish registers have been microfilmed through 1880 and are available only at the National Library of Ireland in Dublin. See:http://www.ireland.com/ancestor/browse/counties/rcmaps/kilke...
The churches will no longer do genealogical research in their records because of the lack of clergy and increase in religious duties. If you wish a specific baptismal record and you have the date of baptism, parents names and if the baptism took place in Castlepollard, you can send a written request to the parish with a donation for a copy of the baptismal record to
Very Rev Patrick Moore PP