http://www.logainm.ie/en is good for Ireland, depending on how the s/sheet was constructed.
If County was used then just select the county and from there select whichever applies,Town or Parish etc.
If it is by Parish you get the names of Parishes where you can then click on to get further breakdowns. With Irish places you have to allow for various spellings like Carrick/Carraigh/Carrig etc for same place.