Catholic secondary · Ajax
Archbishop Denis O’Connor Catholic High School
Use this Ajax school guide to check the essentials: Grades 9–12, English and the school’s official enrolment information. Keep your child’s needs and the exact home address at the centre of the decision.
- Grades
- Grades 9–12
- Teaching language
- English
- School board
- Durham Catholic District School Board
- Address
- 80 Mandrake Street, Ajax, Ontario
- Municipality
- Ajax
School-specific context
Archbishop Denis O’Connor Catholic High School is an Ajax secondary school on Mandrake Street. Its school community traces its origins to 1962 in Whitby and relocated to Ajax in 1984, a helpful distinction when comparing historical references with the current campus.
School background
The school is named for Archbishop Denis O’Connor, a Durham Region native and former Archbishop of Toronto. Its current school history records the move to Ajax in 1984.
Family research
Use current guidance and course information to assess options beyond the published academic score. The board’s locator and registration team should confirm the specific home address, school year and program.
BEFORE YOU CHOOSE A HOME
Check the address.
Confirm the program.
A nearby home or a shared municipality does not guarantee a place. Ask the board about attendance boundaries and the school about any separate entry requirements.
Considering a home in Ajax?
Explore the municipality once you have checked the school’s entry rules. These searches do not establish distance, school boundaries, transportation or admission.
Official sources and check dates
- Official school information Source checked Oct 3, 2026
- Durham Catholic school directory Source checked Oct 3, 2026
- School locator and grade information Source checked Oct 3, 2026
- Fraser individual school record — identity and result Source checked Oct 3, 2026
- Fraser Institute 2025 report — 2023/2024 results Source checked Oct 3, 2026
These guides use AI-assisted research and dated public source records. A source check is not a school visit or a personal assessment. For a correction, choose a team member to contact.