Timothy O Calloghan to Michael O Connar - 1911 Census household returns
- Timothy O Calloghan
- Mary O Cane
- Daniel O Cannell
- James O Cannell
- Frank O Cannon
- Mabel O Cannon
- Elizabeth Ann O Cannor
- Ernest Verschoyle O Cannor
- John O Cannor
- Margaret Jane O Cannor
- Patrick O Cannor
- Saxer O Cannor
- William O Cannor
- James O Caroll
- Bernard Glanville O Carroll
- Cecil O Carroll
- Edith Helen O Carroll
- John O Carroll
- Patrick O Carroll
- Patrick O Carroll
- Timothy O Carroll
- Veronica O Carroll
- Walter D O Carroll
- Wilfrid Vivian Ferns O Carroll
- William O Carroll
- William Bernis O Carroll
- Rosa Priscilla O Carroll- Upton
- Eugena O Cavanagh
- Anthony O Cego
- Charles O Chiltree
- Harry O Cilton
- Annie Eliza O Clarey
- Cecile O Clarey
- Robert John O Clarey
- Frederick Edwin O Clee
- Keyes O Clery
- Lawrence O Clery
- Bridget O Comell
- Caroline Elizabeth O Comor
- Mary O Condell
- Daniel O Conell
- Thomas O Conell
- Thomas O Conell
- Thomas O Connall
- Michael O Connar