Mary O Conoll to Thomas O Donagho - 1881 Census household returns
- Mary O Conoll
- Peter O Conon
- Denis O Conor
- Frederick P O Conor
- Timothy O Conor
- William O Conor Aston
- Fergus O Conus Anderton
- Samuel O Cordy
- Caleb O Coy
- Walter O Dair
- Hugh O Dard Dutton
- Bridget O Day
- Edward O Day
- James O Day
- John O Day
- John O Day
- Mary O Day
- Patrick O Day
- Patrick O Day
- Patrick O Day
- Tom O Day
- Michael O Dea
- Patrick O Dea
- Michael O Deane
- Anne O Dear
- William O Dele
- Bennett O Dell
- John O Dell
- John O Dell
- Mary A O Dell
- Mathusilah O Dell
- Richard O Dell
- Samuel O Dell
- Thomas O Dell
- Barnard J B O Dogherty
- Elizabeth O Doherty
- John L O Doherty
- Rebecca A H O Doherty
- Maurice O Donaell
- Thomas O Donagho