Alexander Ogston to James Oldfield - 1881 Census household returns
- Alexander Ogston to James Ogston
- James Ogston to Elizabeth Ohaire
- Ann Ohale to Robert Ohara
- Thomas Ohara to Robert Ohlier
- Maria Ohlmschlager to Peter Oiller
- Samuel Oils to Richard Oke
- Richard Oke to Jeremiah Okeefe
- Margaret Okeefe to Mary Okell
- Peter Okell to John Okenshaw
- Peter Okenwall to Thomas Okey
- William Okey to Joseph Oklund
- Isaac Oknofski to Bessy Olasworth
- William T Olaver to Arthur Old
- Barnett Old to Francis Old
- Francis Old to Henry J Old
- Honor Old to John Old
- John Old to Richard Old
- Richard Old to Thomas Old
- Thomas Old to Edmund J Oldacre
- Elijah Oldacre to John Oldacres
- John Oldacres to William A Oldaker
- William Oldakers to Thomas Oldall
- Ann Oldam to Henry Oldbury
- Isaiah Oldbury to Joseph Oldcorn
- Joseph Oldcorn to George Olden
- George Olden to William Olden
- William Olden to Samuel Older
- Sarah Older to George Oldershaw
- George Oldershaw to Pilgrim Oldershaw
- Richard H Oldershaw to Jackson Oldfiel
- A Oldfield to Andrew Oldfield
- Andrew Oldfield to Benjamin Oldfield
- Benjamin Oldfield to Charlotte Oldfield
- Christiania Oldfield to Edward F Oldfield
- Edward Ll Oldfield to Emma Oldfield
- Emma E Oldfield to George Oldfield
- George Oldfield to George Oldfield
- George Oldfield to Henry Oldfield
- Henry Oldfield to Herbert Oldfield
- Hiram Oldfield to James Oldfield