Martin O Sullivan to Peter J O' Hanlon - 1881 Census household returns
- Martin O Sullivan
- Mary O Sullivan
- Michael O Sullivan
- Patrick O Sullivan
- Thomas O Sullivan
- Timothy O Sullivan
- Timothy O Sullivan
- Timothy O Sullivan
- Timothy O Sullivan
- James O O Sullivant
- David O Swald
- George O Thirkell
- Arthur E O Tool
- Louisa O Tool
- Bryan O Toole
- Christopher O Toole
- Francis O Toole
- James O Toole
- James O Toole
- John O Toole
- John O Toole
- Joseph O Toole
- Lawrance O Toole
- Mary O Toole
- Mary O Toole
- Michael O Toole
- Patrick O Toole
- Richard O Toole
- Roger O Toole
- S W O Toole
- Theobald M O Toole
- Thomas O Toole
- Thomas O Toole
- Thomas O Toole
- James O' Brian
- Julia O' Brian
- Timothy O' Brian
- Mary O' Connnor
- Arthur O' Donnell
- Peter J O' Hanlon