Jelaskan O dari Senarai bandar dan kampung di Republik Ireland dalam bahasa melayu

O'Briensbridge, O'Callaghans Mills, Ogonnelloe, Oilgate, Old Leighlin, Oldcastle, Oldtown (Dublin), Old Town (Roscommon), Omeath, Ongar, Oola, Oranmore, Oughterard, Oulart, Ovens, Owenbeg, Oxmantown, Oysterhaven