Mary O 'Brien to Margaret O Harro - 1881 Census household returns
- Mary O 'Brien to Ellen O Brian
- Ellin O Brian to Margaret O Brian
- Margaret O Brian to Peter O Brian
- Philip O Brian to Catherine O Brien
- Catherine O Brien to Edward O Brien
- Edward O Brien to James O Brien
- James O Brien to Jeremiah O Brien
- Jeremiah O Brien to John O Brien
- John O Brien to Laura O Brien
- Louisa O Brien to Michael O Brien
- Michael O Brien to Patrick O Brien
- Patrick O Brien to Sophia O Brien
- Stephen Z O Brien to William O Brien
- William O Brien to Thomas O Brion
- Timathy O Brion to Cornelius O Cain
- Phelix O Caine to Maria O Connel
- Patrick O Connel to Jeremiah O Connell
- Johana O Connell to Patrick O Connell
- Patrick O Connell to James O Conner
- James O Conner to Benjamin O Connor
- Bridget O Connor to Francis O Connor
- Francis O Connor to John O Connor
- John O Connor to Mary O Connor
- Mary O Connor to Peter O Connor
- Phoebe O Connor to Fergus O Connors Smith
- Mary O Conoll to Thomas O Donagho
- John O Donaghue to William O Donell
- Peter O Donghue to Charles O Donnell
- Charles O Donnell to John O Donnell
- John O Donnell to Michael O Donnell
- Michael O Donnell to Charlotte O Donoghue
- Daniel O Donoghue to Thomas O Edwards
- George O Farby to Terence O Gorman
- Thomas O Gorman to Emma O Hagan
- James O Hagan to James O Hanlon
- John O Hanlon to James O Hara
- James O Hara to Mary O Hara
- Matilda O Hara to Catherine O Hare
- Catherine O Hare to Michael O Hare
- Michael O Hare to Margaret O Harro