- OECTA has represented teachers in Ontario's Catholic schools since 1944.
- OECTA has approximately 45,000 members:
- 23,000 elementary teachers
- 13,000 secondary teachers
- 9,000 occasional teacher
- OECTA members teach more than half a million students in 1,135 Catholic elementary schools and 219 Catholic secondary schools throughout Ontario.
- Approximately one half of OECTA's members live in the Golden Horseshoe and Hamilton area, in Dufferin-Peel, Durham, Toronto, Simcoe, and York. More than 6,000 teachers are in Toronto alone.
OECTA is affiliated with the Congress of Union Retirees of Canada
, Ontario Teachers' Federation
, the Canadian Teachers' Federation
, Education International
, the Ontario Federation of Labour (OFL)
, and the Canadian Labour Congress (CLC)