| O'Donoghue Ave, Janesboro | — | 10 |
| O'Dwyer Villas, Thomondgate | — | 11 |
| O'Meara Avenue, Bengal Terrace | €110,000 | 9 |
| Oak Avenue, Adare | €519,824 | 12 |
| Oak Avenue, Evanwood | €412,500 | 34 |
| Oak Close, Bloomfield | — | 6 |
| Oak Drive, Bloomfield | — | 21 |
| Oakfield, Father Russell Road | €391,000 | 32 |
| Oakfield, Fr Russell Road | — | 10 |
| Oakfield, Monaleen | €600,000 | 10 |
| Oakfield, Raheen | €380,000 | 14 |
| Oakland Dr, Greystones | — | 7 |
| Oaklawns, Castletroy | €310,500 | 20 |
| Oakleigh Wood, Dooradoyle | €242,000 | 71 |
| Oakleigh Wood, Dooradoyle Rd | — | 5 |
| Oakleigh Woods, Dooradoyle | — | 5 |
| Oakleighwood, Dooradoyle | — | 5 |
| Oakpark, Gortboy | — | 5 |
| Oakpark, Newcastle West | — | 6 |
| Oakvale Drive, Dooradoyle | €306,000 | 13 |
| Oakview Drive, Ballinacurra | €245,000 | 17 |
| Oakwood, Old Singland Road | €265,000 | 6 |
| Oconnell Mews, Barrack Hill | — | 5 |
| Odwyers Villas, Thomondgate | €168,000 | 16 |
| Old Kildimo, Kildimo | — | 6 |
| Old School House, Patrickswell | — | 7 |
| Old Westfields, North Circular Road | — | 5 |
| Old Windmill Court, Gerald Griffin St Lower | €233,000 | 14 |
| Old Windmill Court, Little Gerald Griffin St | €183,000 | 15 |
| Old Windmill Court, Lower Gerald Griffin Street | €197,500 | 44 |
| Old Windmill Court, Lower Gerard Griffin St | — | 12 |
| Oldtown, Hospital | €155,000 | 15 |
| Orchard Avenue, Church Street | — | 6 |
| Orchard Avenue, Rathkeale | — | 10 |
| Orr Street, Kilmallock | — | 5 |
| Osmington Terrace, Thomondgate | — | 7 |
| Owenmore Dr, Raheen Heights | — | 7 |
| Owenmore Drive, Raheen | €271,000 | 12 |
| the oaks, riverbank | — | 9 |
| The Oaks, Liscreagh | €262,000 | 25 |
| The Oaks, Murroe | — | 5 |
| The Orchard, Castletroy | €225,000 | 30 |
| The Orchard, Killarney Road | — | 9 |
| The Oval, Gouldavoher | — | 6 |