| O'Growney Street, Athboy | — | 8 |
| Oak Avenue, The Willows | €365,639 | 17 |
| Oak Court, Dunderry | — | 5 |
| Oak Crescent, Athlumney Wood | — | 11 |
| Oak Drive, Beaufort Place | — | 8 |
| Oak Drive, The Willows | €440,529 | 7 |
| Oak Hall, Carlanstown | — | 7 |
| Oak Manor, The Willows | €370,044 | 25 |
| Oak Park, The Willows | €378,854 | 18 |
| Oak Place, Bailis Downs | — | 6 |
| Oak Place, The Willows | €348,017 | 22 |
| Oak Pointe, The Willows | €370,044 | 15 |
| Oak Vale, Bailis Downs | — | 5 |
| Oak View, The Willows | €352,409 | 8 |
| Oak Village, The Willows | €320,000 | 22 |
| Oak Way, The Willows | €332,599 | 30 |
| Oakfield Crescent, Dunboyne | €440,529 | 7 |
| Oakfield Crescent, Oakfield | €524,390 | 7 |
| Oakfield Cresent, Dunboyne | €555,066 | 6 |
| Oakfield Drive, Dunboyne | €440,529 | 9 |
| Oakfield Drive, Oakfield | €519,823 | 19 |
| Oakleigh, Dublin Road | — | 11 |
| Oakleigh, Longwood | €320,000 | 14 |
| Oakleigh, Main Street | — | 7 |
| Oakleigh, Navan | — | 7 |
| Oakleigh, Trim Road | €309,000 | 18 |
| Oakleigh Dr, Longwood | — | 5 |
| Oakley Park, Kells | — | 12 |
| Oakley Park Green, Dublin Road | €343,612 | 7 |
| Oakley Park Green, Enfield | €337,004 | 16 |
| Oakley Park Green, Oakley Park | €343,612 | 7 |
| Oakley Park Walk, Enfield | €343,612 | 15 |
| Oakley Park Walk, Oakley Park | €343,612 | 9 |
| Oakwood House, Royal Oaks | €242,291 | 11 |
| Oberstown, Tara | — | 19 |
| Ogrowney Close, Athboy | — | 6 |
| Ogrowney Terrace, Kells | €183,750 | 14 |
| Ogrowney Terrace, Navan | €218,500 | 8 |
| Old Athlumney Manor, Old Athlumney Road | — | 5 |
| Old Balreask Woods, Dublin Rd | — | 5 |
| Old Balreask Woods, Navan | €382,500 | 37 |
| Old Balreask Woods, Swan Lane | — | 5 |
| Old Court, Drumconrath | — | 8 |
| Old Fair Green, Dunboyne | — | 9 |
| Old Forge, Haggard St | — | 11 |
| Old Road, Dunsany | — | 8 |
| Oldtown, Johnstown | — | 5 |
| Oliver Plunkett Pk, Kentstown | — | 6 |
| Ongenstown, Bohermeen | — | 7 |
| Orchard Close, Stamullen | — | 5 |
| Orchard Drive, Stamullen | — | 6 |
| Orchard Vale, Stamullen | — | 6 |
| Oristown, Kells | — | 8 |
| Otterstown, Athboy | — | 7 |
| The Oaks, Archerstown Demesne | — | 13 |
| The Oaks, Avourwen | €351,982 | 22 |
| The Oaks, Bachelors Walk | — | 6 |
| The Old Forge, Dunshaughlin | — | 6 |
| The Old Mill, Fairyhouse Road | — | 10 |
| The Old Mill, Ratoath | €583,000 | 24 |
| The Old Station House, Trim Road | — | 8 |
| The Orchard, Athlumney | — | 10 |
| The Orchard, Carlanstown | €356,811 | 8 |
| The Orchard, Dunshaughlin | €451,542 | 14 |
| The Orchard, Johnstown Demense | €387,665 | 5 |
| The Orchard, Johnstown Demesne | €388,833 | 58 |
| The Orchard, St Oliver's Road | €422,907 | 5 |