Kingston
- O'Donnell, Sarah
- O'Donoghu, Charles
- O'Donoghue, Annie
- O'Donoghue, Leonard
- O'Donoghue, Leonard
- O'Donoghue, Mary
- O'Donovan, Myra
- O'Dorsett, Eileen
- O'Dowd, Jeremiah
- O'Drager, Stephen
- O'Driscoll, Henry
- O'Duffy, Carmel
- O'Dwyer, Daniel
- O'Dwyer, Daniel
- O'Dwyer, Kathleen
- O'Dwyer, Nora
- O'Fflahertie, Gwendoline
- O'Fflahertie, Lucy
- O'Field, John
- O'Gorman, John
- O'Gorman, Patrick
- O'Gorman-Lalor, Nicholas
- O'Grady, James
- O'Grady, Suzanne
- O'Halloran, Daniel
- O'Hara, John
- O'Hara, Winifred
- O'Horne, Patrick
- O'Keefe, Elizabeth
- O'Keefe, Ellen
- O'Keefe, James
- O'Keefe, James
- O'Keefe, Michael
- O'Kelly, Kathleen
- O'Kines, John
- O'Leary, Cecilia
- O'Leary, Mary
- O'Leary, May
- O'Leary, Michael
- O'Leary, Patrick
- O'Maley, Philip
- O'Malley, Thomas
- O'Meara, Charlotte
- O'Neal, Bobbie
- O'Neil, Charles
- O'Neill, Anne
- O'Neill, Bernard
- O'Neill, Elizabeth
- O'Neill, Ellen
- O'Neill, Emma