| O Hogan Rd, Ballyfermot | — | 6 |
| O Rourke Park, Sallynoggin | — | 6 |
| O'Brien Road, Walkinstown | €432,500 | 22 |
| O'Carolan Road, South Circular Road | — | 5 |
| O'Connell Avenue, Phibsborough | €475,000 | 8 |
| O'Connell Gardens, Sandymount | €817,500 | 18 |
| O'Curry Avenue, South Circular Road | — | 5 |
| O'Curry Road, South Circular Road | — | 6 |
| O'Daly Road, Drumcondra | €455,500 | 11 |
| O'Donnell Gardens, Glasthule | €679,200 | 23 |
| O'Donoghue Street, Inchicore | — | 13 |
| O'Donovan Road, South Circular Road | — | 5 |
| O'Hogan Road, Ballyfermot | €330,000 | 8 |
| O'Leary Road, Inchicore | — | 6 |
| O'Moore Road, Ballyfermot | €252,500 | 12 |
| O'Neachtain Road, Drumcondra | €425,000 | 17 |
| O'Rourke Park, Sallynoggin | €501,000 | 36 |
| O'Sullivan Avenue, Ballybough | — | 5 |
| Oak Apple Green, Rathgar | €580,000 | 12 |
| Oak Ave, Royal Oak | — | 8 |
| Oak Court, Royal Oak | — | 6 |
| Oak Court Avenue, Palmerstown | — | 6 |
| Oak Court Drive, Palmerstown | — | 6 |
| Oak Court Lawn, Palmerstown | — | 5 |
| Oak Court Park, Palmerstown | — | 10 |
| Oak Downs, Clondalkin | — | 8 |
| Oak Dr, Royal Oak | — | 11 |
| Oak Green, Royal Oak | €440,000 | 13 |
| Oak Grove, Royal Oak | — | 6 |
| Oak Hall, Clay Farm | €385,463 | 12 |
| Oak Hall, Larkfield View | €376,652 | 8 |
| Oak Hall, Malahide | €435,000 | 12 |
| Oak Hall, The Hill | €387,500 | 14 |
| Oak House, Carrickmines Green | €311,454 | 16 |
| Oak House, Silverbanks | — | 19 |
| Oak Lawn, Castleknock | — | 6 |
| Oak Park, Kinsealy Lane | €594,714 | 48 |
| Oak Park Ave, Santry | — | 7 |
| Oak Park Drive, Santry | — | 10 |
| Oak Park Grove, Santry | — | 6 |
| Oak Rise, Clondalkin | €345,000 | 14 |
| Oak Rise, Greenpark | — | 7 |
| Oak Rise, Royal Oak | — | 13 |
| Oak Road, Donnycarney | €392,250 | 37 |
| Oak View, Santry | — | 8 |
| Oak Way, Clondalkin | — | 12 |
| Oakcourt Avenue, Palmerstown | €350,000 | 13 |
| oakcourt close, palmerstown | — | 6 |
| Oakcourt Drive, Palmerstown | €320,000 | 23 |
| Oakcourt Grove, Palmerstown | — | 5 |
| Oakcourt Lawn, Palmerstown | €277,500 | 16 |
| Oakcourt Park, Palmerstown | €403,000 | 13 |
| Oakdale Close, Ballycullen | €500,000 | 19 |
| Oakdale Drive, Ballycullen | — | 7 |
| Oakdale Drive, Dun Laoghaire | €885,000 | 8 |
| Oakdale Park, Ballycullen | — | 13 |
| Oakdale Road, Ballycullen | — | 6 |
| Oakdene, Ballinclea Road | €980,000 | 12 |
| Oakdene, Killiney | — | 5 |
| Oakdown Road, Churchtown | — | 9 |
| Oakfield Place, Dublin 8 | — | 6 |
| Oaklands Avenue, Swords | €418,500 | 28 |
| Oaklands Crescent, Rathgar | — | 9 |
| Oaklands Drive, Rathgar | €1,186,250 | 17 |
| Oaklands Park, Ballsbridge | — | 12 |
| Oaklands Park, Sandymount | — | 15 |
| Oaklands Park, Swords | — | 9 |
| Oaklands Tce., Terenure | €752,000 | 14 |
| Oakley Court, Oakley Rd | €370,000 | 10 |
| Oakley Park, Blackrock | — | 11 |
| Oakley Park, Clontarf | €831,000 | 10 |
| Oakley Road, Ranelagh | €1,500,000 | 19 |
| oakley square, oakley road | — | 5 |
| Oakpark Avenue, Santry | — | 5 |
| Oakton Green, Ballybrack | €540,000 | 8 |
| Oakton Park, Ballybrack | €450,000 | 28 |
| Oaktree Grove, Castleknock | — | 5 |
| Oaktree Road, Stillorgan | €846,000 | 16 |
| Oakview Avenue, Clonsilla | — | 8 |
| Oakview Avenue, Hartstown | — | 14 |
| Oakview Close, Hartstown | — | 10 |
| Oakview Way, Hartstown | €410,000 | 11 |
| Oakwood Avenue, Glasnevin | — | 5 |
| Oakwood Avenue, Swords | €385,000 | 9 |
| Oakwood Grove, Clondalkin | €405,000 | 29 |
| Oakwood Park, Finglas | — | 5 |
| oakwood Road, Finglas | — | 9 |
| Oakwood Road, Finglas East | — | 7 |
| Oatfield Avenue, Clondalkin | — | 13 |
| Oatfield Drive, Clondalkin | — | 6 |
| Oatlands Manor, Mount Merrion | €1,233,480 | 10 |
| Obelisk Avenue, Blackrock | €580,000 | 13 |
| Obelisk Avenue, St. Augustine's Park | — | 12 |
| Obelisk Grove, Blackrock | — | 6 |
| Obelisk Grove, St Augustines Park | — | 7 |
| Obelisk Rise, St. Augustine's Park | €743,006 | 18 |
| Obelisk Walk, Carysfort Avenue | €727,000 | 5 |
| Obelisk Walk, St. Augustine's Park | €522,500 | 10 |
| Oblate Dr, Inchicore | — | 5 |
| Oblate View, Tyrconnell Rd | — | 7 |
| Obriens Place, Drumcondra | — | 8 |
| Observatory Court, Observatory Lane | — | 5 |
| Observatory Lane, Rathmines | — | 6 |
| Ocasey Hall, Collegewood | €375,000 | 18 |
| Oconnell Gardens, Bath Ave | — | 5 |
| Ocurry Rd, Circular Rd South | — | 5 |
| Odins Way, Taylors Lane | — | 25 |
| Odonovan Rd, Circular Rd South | — | 5 |
| Odwyer Rd, Walkinstown | — | 6 |
| Offaly Road, Cabra | €367,500 | 20 |
| Offington Avenue, Sutton | €900,000 | 28 |
| Offington Court, Sutton | — | 7 |
| Offington Drive, Sutton | €935,000 | 27 |
| Offington Lawn, Sutton | €1,100,000 | 13 |
| Offington Manor, Sutton | — | 11 |
| Offington Park, Sutton | €935,000 | 33 |
| Oileain Na Cranoige.Cranogue Isl, Balbutcher Lane | — | 7 |
| Oileain Na Cranoige/Cranogue Isl, Balbutcher Lane | €194,713 | 26 |
| Olaf Road, Stoneybatter | — | 16 |
| Olcovar, Dublin Rd | €376,500 | 48 |
| Olcovar, Shankhill | — | 7 |
| Olcovar, Shankill | €412,500 | 84 |
| Old Bawn Avenue, Tallaght | €465,000 | 12 |
| Old Bawn Drive, Tallaght | €511,750 | 8 |
| Old Bawn Park, Tallaght | — | 8 |
| Old Bawn Road, Tallaght | €335,000 | 20 |
| Old Bawn Way, Tallaght | €446,000 | 11 |
| Old Blessington Road, Tallaght | — | 6 |
| Old Bray Road, Cabinteely | — | 11 |
| Old Bridge Road, Templeogue | — | 7 |
| Old Cabra Road, Cabra | — | 12 |
| Old Cabra Road, Dublin 7 | €960,000 | 25 |
| Old Castle View, Kilgobbin Rd | €299,343 | 8 |
| Old Church Grove, Clondalkin | — | 5 |
| Old Co Glen, Crumlin | — | 5 |
| Old Co Rd, Crumlin | — | 8 |
| Old Connaught House, Ferndale Road | €397,500 | 13 |
| Old County Glen, Crumlin | €422,000 | 12 |
| Old County Road, Crumlin | €440,000 | 31 |
| Old County Road, Dublin 12 | — | 5 |
| Old Court Avenue, Firhouse | €465,000 | 11 |
| Old Court Cottages, Tallaght | €610,000 | 5 |
| Old Court Lawn, Firhouse | — | 5 |
| Old Court Lodge, Firhouse | €350,000 | 14 |
| Old Court Manor, Firhouse | — | 8 |
| Old Distillery, Beresford Street | — | 9 |
| Old Estuary Mill, Estuary Road | — | 10 |
| Old Estuary Mill, Malahide | — | 5 |
| Old Farm, Carpenterstown Rd | — | 5 |
| Old Finglas Road, Glasnevin | €751,000 | 24 |
| Old Kilmainham, Kilmainham | — | 6 |
| Old Kilmainham Rd, Kilmainham | — | 6 |
| Old Kilmainham Village, Bow Lane | — | 6 |
| Old Kilmainham Village, Bow Lane West | — | 9 |
| Old Kilmainham Village, Bowe Lane West | — | 5 |
| Old Mill Court, Malpas Street | — | 8 |
| Old Navan Road, Castleknock | — | 10 |
| Old Rectory Park, Dundrum | — | 12 |
| Old Rectory Park, Taney Rd | — | 5 |
| Old Street, Malahide | €540,000 | 11 |
| Oldbridge Court, Lucan | — | 8 |
| Oldbridge Green, Lucan | — | 7 |
| Oldbridge Grove, Lucan | — | 5 |
| Oldbridge Park, Lucan | — | 15 |
| Oldbridge View, Lucan | — | 10 |
| Oldbridge Walk, Lucan | — | 6 |
| OldCourt Lodge, Firhouse | €400,000 | 10 |
| Oldcourt Park Drive, Ballycullen Gate | €572,687 | 13 |
| Oldfield Hall, Ticknock Hill | €395,000 | 17 |
| Oldtown Avenue, Santry | €389,125 | 16 |
| Oldtown Court, Oldtown | — | 5 |
| Oldtown Park, Santry | — | 11 |
| Oldtown Road, Santry | €382,500 | 16 |
| Olivemount Grove, Dundrum | — | 6 |
| Olivemount Road, Dundrum | — | 7 |
| Oliver Plunkett Avenue, Dun Laoghaire | — | 6 |
| Oliver Plunkett Avenue, Monkstown | — | 10 |
| Oliver Plunkett Avenue, Monkstown Farm | €551,000 | 15 |
| Oliver Plunkett Rd, Monkstown Farm | €634,000 | 11 |
| Oliver Plunkett Road, Dun Laoghaire | €533,000 | 20 |
| Oliver Plunkett Road, Monkstown | €418,000 | 14 |
| Oliver Plunkett Square, Monkstown Farm | — | 5 |
| Oliver Plunkett Villas, Monkstown Farm | — | 6 |
| Olney Crescent, Terenure | — | 7 |
| One Beacon, Beacon Court | — | 10 |
| One Beacon, Sandyford | — | 7 |
| One Springfield Park, Dublin 18 | €635,000 | 5 |
| One Springfield Park, Pine Avenue | €590,308 | 9 |
| Ongar Lodge, Ongar | — | 5 |
| Ontario Terrace, Rathmines | — | 5 |
| Onyx, The Grange | €448,000 | 13 |
| Ophaly Court, Dundrum | €610,750 | 16 |
| Oranmore Road, Ballyfermot | €310,000 | 49 |
| Orby, Phoenix Park Avenue | €460,621 | 38 |
| Orby Avenue, The Gallops | €710,500 | 21 |
| Orby Close, The Gallops | — | 11 |
| Orby Court, The Gallops | — | 6 |
| Orby Dr, The Gallops | — | 6 |
| Orby Lawn, The Gallops | — | 8 |
| Orby Park, the Gallops | — | 8 |
| Orby View, The Gallops | — | 11 |
| Orby Way, The Gallops | — | 13 |
| Orchard Hall, Diswellstown | €331,500 | 35 |
| Orchard Lane, Newtown Park | €427,500 | 8 |
| Orchard Lodge, Watery Lane | — | 24 |
| Orchard Sq, The Maples | — | 6 |
| Orchard Terrace, Grangegorman Upper | €522,500 | 8 |
| Orchard View, Beaverstown Road | — | 15 |
| Orchard Way, Ayrfield | — | 5 |
| Orchard Way, Greenwood | — | 5 |
| Orchard Way, Greenwood Walk | €260,000 | 35 |
| Orchardstown Avenue, Rathfarnham | €745,000 | 18 |
| Orchardstown Drive, Rathfarnham | — | 6 |
| Orchardstown Drive, Templeogue | €655,000 | 16 |
| Orchardstown Park, Rathfarnham | — | 5 |
| Orchardstown Park, Templeogue | — | 8 |
| Orchardton Mews, Sweetmount Ave | — | 12 |
| Oreilly Ave, Ceannt Fort | — | 5 |
| Orlagh Downs, Knocklyon | — | 7 |
| Orlagh Downs, Orlagh Grove | — | 8 |
| Orlagh Park, Knocklyon | — | 9 |
| Orlagh View, Knocklyon | — | 7 |
| Orlagh Wood, Knocklyon | — | 5 |
| Orlagh Wood, Orlagh Grove | — | 5 |
| Orlynn Park, Lusk | €390,000 | 29 |
| Ormond Avenue, Rush | €414,097 | 50 |
| Ormond Court, Palmer Avenue | €436,123 | 8 |
| Ormond Crescent, Swords | — | 5 |
| Ormond Road, Drumcondra | — | 9 |
| Ormond Road, Rathmines | €1,450,000 | 18 |
| Ormond Sq, Dublin 7 | — | 9 |
| Orpen Close, Stillorgan Grove | €640,000 | 8 |
| Orpen Green, Blackrock | — | 8 |
| Orpen Green, Stillorgan | — | 8 |
| Orpen Green, Stillorgan Grove | €647,500 | 13 |
| Orpen Hall, Brennanstown Wood | €559,471 | 47 |
| Orpen Hill, Stillorgan | — | 6 |
| Orpen Hill, Stillorgan Grove | €605,000 | 15 |
| Orpen Rise, Stillorgan Grove | — | 6 |
| Orwell Bank, Orwell Park | — | 6 |
| Orwell Court, Braemor Road | — | 9 |
| Orwell Gardens, Churchtown | €626,000 | 18 |
| Orwell Gardens, Dublin 14 | €683,050 | 10 |
| Orwell Gardens, Rathgar | €640,000 | 25 |
| Orwell Gate, Block A | — | 23 |
| Orwell Gate, Marianella | — | 22 |
| Orwell Gate Block A, Marianella | — | 5 |
| Orwell Hall, Block C | — | 12 |
| Orwell Hall, Block C Marianella | — | 5 |
| Orwell Hall, Marianella | — | 17 |
| Orwell Park, Rathgar | €3,150,000 | 49 |
| Orwell Park Ave, Templeogue | — | 5 |
| Orwell Park Close, Templeogue | — | 9 |
| Orwell Park Crescent, Templeogue | — | 6 |
| Orwell Park Dr, Templeogue | — | 6 |
| Orwell Park Gardens, Orwell Park | €1,079,295 | 8 |
| Orwell Park Gardens, Rathgar | — | 11 |
| Orwell Park Glade, Templeogue | — | 9 |
| Orwell Park Green, Templeogue | — | 14 |
| Orwell Park Grove, Templeogue | €700,000 | 9 |
| Orwell Park Heights, Templeogue | €572,500 | 18 |
| Orwell Park Rise, Templeogue | €630,000 | 27 |
| Orwell Park Square, Rathgar | — | 6 |
| Orwell Park View, Templeogue | €550,000 | 18 |
| Orwell Park Way, Templeogue | — | 7 |
| Orwell Place, Block B | — | 15 |
| Orwell Place, Marianella | €780,000 | 25 |
| Orwell Rd, Churchtown | — | 5 |
| Orwell Road, Rathgar | €695,000 | 32 |
| Orwell Woods, Orwell Park | — | 7 |
| Orwell Woods, Rathgar | €676,250 | 17 |
| Oscar Sq, Dublin 8 | — | 7 |
| Oscar Square, South Circular Road | — | 5 |
| Osprey Avenue, Templeogue | — | 7 |
| Osprey Lawn, Templeogue | — | 6 |
| Osprey Park, TEmpleogue | €547,500 | 10 |
| Ossory Road, Dublin 3 | — | 8 |
| Ossory Road, North Strand | €355,000 | 12 |
| Ostman Place, Stoneybatter | €436,000 | 11 |
| Otterbrook, Willbrook Road | — | 14 |
| Oulart, Forest Rd | — | 7 |
| Oulton Road, Clontarf | €987,500 | 13 |
| Our Lady's Road, Maryland | — | 8 |
| Outfarm Wood, Carpenterstown Road | €823,788 | 8 |
| Ovoca Road, Portobello | — | 6 |
| Ovoca Road, South Circular Road | — | 7 |
| Owendoher Lodge, Ballyboden Road | €459,000 | 91 |
| Owendore Crescent, Rathfarnham | — | 7 |
| Owens Ave, Ceannt Fort | €457,500 | 9 |
| Owenstown Lodge, Fosters Avenue | — | 12 |
| Oxford Road, Ranelagh | — | 16 |
| Oxmanstown Lofts, Coke Lane | — | 11 |
| Oxmanstown Road, Dublin 7 | — | 9 |
| Oxmantown Rd, Circular Rd North | €395,000 | 6 |
| Oxmantown Rd, North Circular Rd | — | 6 |
| Oxmantown Road, Dublin 7 | €457,500 | 41 |
| Oxmantown Road, Stoneybatter | €447,000 | 45 |
| The Oak, Charleville Square | €450,000 | 11 |
| The Oak, Grange Hall | — | 6 |
| The Oak, Grattan Wood | — | 6 |
| The Oak, Park View | €360,000 | 12 |
| The Oak, Parkview | €258,007 | 7 |
| The Oak, Rockfield | — | 10 |
| The Oak, Trimbleston | €565,000 | 19 |
| The Oaks, Barnoaks | €316,087 | 32 |
| The Oaks, Belgard Heights | €402,500 | 18 |
| The Oaks, Carrington | — | 26 |
| The Oaks, Charleville Square | — | 6 |
| The Oaks, Clontarf | — | 6 |
| The Oaks, Elmfield | — | 32 |
| The Oaks, Grove House | — | 5 |
| The Oaks, Herbert Park Lane | €423,000 | 22 |
| The Oaks, Pelletstown Manor | €376,000 | 13 |
| The Oaks, Red Rock Field | €407,489 | 6 |
| The Oaks, Ridgewood | €342,000 | 75 |
| The Oaks, Rockfield | €435,000 | 46 |
| The Oaks, Scholarstown Wood | €330,272 | 36 |
| The Oaks, Stradbrook Hill | — | 6 |
| The Oat House, Baker's Yard | — | 8 |
| The Ogham, Granitefield Manor | €298,000 | 9 |
| The Old Chocolate Factory, Kilmainham Sq | — | 9 |
| The Old Distillery, Anne St North | — | 5 |
| The Old Distillery, Beresford Street | €300,250 | 33 |
| The Old Distillery, North Anne St | — | 6 |
| The Old Distillery, Smithfield | — | 5 |
| The Old Forge, Hayden's Lane | — | 12 |
| The Old Forge, Lucan | €427,500 | 24 |
| The old golf links, Malahide | — | 10 |
| The Old Presbytery, Cookstown Road | — | 9 |
| The Old Rectory, Chapel Hill | — | 5 |
| The Old Rectory, Lucan | — | 7 |
| The Old Schoolhouse, Portrane | — | 6 |
| The Old Vicarage, Church Rd | €368,500 | 8 |
| The Olde Dock, Little Ship Street | €260,000 | 12 |
| The Olde Dock, Ship St Little | — | 5 |
| The Oldschool House, Portrane | — | 5 |
| The Orchard, Carpenterstown Rd | €257,500 | 15 |
| The Orchard, Cherryfield Ave Upper | — | 5 |
| The Orchard, Fortfield Road | — | 9 |
| The Orchard, Greenwood | — | 10 |
| The Orchard, Greenwood Walk | — | 6 |
| The Orchard, Killester | — | 16 |
| The Orchard, Leixlip Rd | €280,000 | 16 |
| The Orchard, Lucan | — | 7 |
| The Orchard, Monkstown Valley | — | 9 |
| The Orchard, Old Leixlip Rd | — | 8 |
| The Orchard, Oldtown | — | 8 |
| The Orchard, Woodfarm Acres | — | 7 |
| The Orchard Apartments, Cloverhill Road | — | 10 |
| The Osprey, Barnageeragh Cove | — | 9 |
| The Ospreys, Barnageeragh Cove | — | 6 |
| The Oval, Tullyvale | €306,500 | 96 |