Dear Mary Jean,
I am not sure how you can match up this information to your family but here are some listings of Conboy I have come across. It is not a common name around Ballinasloe.
On 25th Sep 1827 there is a death of a Sally Conboy alias Kelly recorded in the Catholic Parish of Ballinasloe. Age appears to be 82 years. You can view:http://registers.nli.ie/registers/vtls000632913#page/99/mode/1up
On 14th Jan 1829 there is a death recorded in the Catholic Parish of Ballinasloe of a Patt Conboy Attyrory aged about 90 years. You can view this http://registers.nli.ie/registers/vtls000632913#page/127/mode/1up
(There are very few death records prior to civil registration in 1864 so this Conboy record is fortunate. The priest's name was L. Dillon. )
Here is a link to Griffits Valuation (1856) which shows a William Conboy and Michael Conboy farming in Attyrory. Attyrory is located in the parish of Creagh, County Roscommon. The nearest town is Ballinasloe,County Galway.
http://www.askaboutireland.ie/griffith-valuation/index.xml?action=doNameSearch&Submit.x=53&Submit.y=15&Submit=Submit&familyname=Adamson&firstname=First+Name&baronyname=&countyname=ROSCOMMON&unionname=&parishname=
There is a birth of Patrick Conboy on August 4th 1867 with address as Attyrory. Father’s name in Michael Conboy and mother's name is Winifred Kenny. A baptismal record for March 1877 shows that Michael and Mary Conaboy were baptismal sponsors for a Catherine Naughton. This Naughton family lived in Attyrory. I assume 'Conaboy' and 'Conboy' are the just variations of spelling.
Generally, the births, marriages and deaths for Attyrory are registered in district of 'Ballinasloe' or 'Roscommon'. You can search in https://civilrecords.irishgenealogy.ie The townland is usually listed on the death record. I forget what time period was registered under the district Ballinasloe but I do know that up to at least 1917 Attyrory births, marriages and deaths appear under district ' Ballinasloe'. In later years, Attyrory registrations appear under district 'Roscommon'.
Three historic graveyards in the adjacent parish of Moore have been recorded but there was no Conboy names located. Most likely the burial ground for this family would be the old graveyard in Creagh.To the best of my knowledge, this has not been transcribed.
It is strange that there is no Conboy in the Creagh environs in 1901 or 1911.
Kind regards,
Marie
moore@irelandxo.com