| Discover your Ancestors – Find your Homeplace Senior genealogist:
Heather Flanders Home
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| Townland | Parish | County |
| Oaghmonicroy | Bodoney Lower | Tyrone |
| Oakfield | Cleenish | Fermanagh |
| Oaklands | Kildress | Tyrone |
| Oghill | Aghalurcher | Fermanagh |
| Oghill | Ballyclog | Tyrone |
| Oghill | Cumber Lower | Londonderry |
| Oghill | Drumkeeran | Fermanagh |
| Oghillicartan | Drumkeeran | Fermanagh |
| Ogilby Island | Comber | Down |
| Old Barr | Devenish | Fermanagh |
| Old Forge | Drumbeg | Antrim |
| Old Freehold | Kilwaughter | Antrim |
| Old Town Deer Park | Ballyscullion | Londonderry |
| Old Warren | Blaris | Antrim |
| Oldstone | Grange of Muckamore | Antrim |
| Oldtown | Ballyrashane | Antrim |
| Ora More or Tullybrack | Cleenish | Fermanagh |
| Oritor | Kildress | Tyrone |
| Orlock | Bangor | Down |
| Oughtagh | Cumber Lower | Londonderry |
| Oughtboy | Bodoney Upper | Tyrone |
| Oughtdoorish | Bodoney Upper | Tyrone |
| Oughterard | Desertcreat | Tyrone |
| Oughterard | Dromore | Tyrone |
| Oughterdrum | Belleek | Fermanagh |
| Oughtmame | Bodoney Upper | Tyrone |
| Oughtnamwella | Bodoney Upper | Tyrone |
| Oughtymore | Magilligan or Tamlaghtard | Londonderry |
| Oughtymoyle | Magilligan or Tamlaghtard | Londonderry |
| Ouna or Eagle Hill | Layd | Antrim |
| Outal | Grange of Dundermot | Antrim |
| Outhill | Ballyrashane | Antrim |
| Outlack | Lisnadill | Armagh |
| Outlands of Galvally | Donaghenry | Tyrone |
| Outleckan | Ballymyre | Armagh |
| O'Valla & Isle | Ballyculter | Down |
| Ovil | Dungiven | Londonderry |
| Owenbeg | Dungiven | Londonderry |
| Owenbreedin | Aghavea | Fermanagh |
| Owenreagh | Ballynascreen | Londonderry |
| Owenreagh | Leckpatrick | Tyrone |
| Owenskerry | Aghalurcher | Fermanagh |
| Owensland | Kilbride | Antrim |
| Owl Island | Inishmacsaint | Fermanagh |