AJAX / CATHOLIC SECONDARY
Archbishop Denis O’Connor Catholic High School
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community traces its origins to 1962 in Whitby and relocated to Ajax in 1984, a helpful distinction when comparing historical references with the current campus.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 board
- Durham Catholic District School Board
- School type
- Catholic secondary
- Grades
- Grades 9–12
- Language
- English
- Address
- 80 Mandrake Street, Ajax, Ontario
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.
CHECK THE ADDRESS FIRST
School choice starts
with the right questions.
Attendance boundaries, programs, grade levels and admission rules can affect your options. A home’s municipality or proximity does not guarantee a place at this school.
EXPLORE THE AREA
New homes in Ajax.
These projects are in the same municipality. This is not a school-boundary or admission match. Confirm the exact address with the board.
Lakeview Homes
Northgate Trails
Ajax, ON
A new Ajax community with townhomes and detached homes, combining brick-and-stone architecture, open living spaces and access to parks, trails and everyday amenities.
BEFORE YOUR NEXT MOVE
Your questions,
answered.
Which school board operates Archbishop Denis O’Connor Catholic High School?
Archbishop Denis O’Connor Catholic High School is part of Durham Catholic District School Board. Use the official school and board links on this page for current programs, school information and registration.
Will a home listed here qualify for admission to Archbishop Denis O’Connor Catholic High School?
A listed project does not establish eligibility for Archbishop Denis O’Connor Catholic High School. The new-home suggestions are grouped by municipality, not attendance boundary. Confirm the exact home address, program, grade and admission requirements with Durham Catholic District School Board before relying on a school assignment.
What does the academic score for Archbishop Denis O’Connor Catholic High School mean?
The 2025 Fraser Institute report gives the school 5.9 out of 10 using the 2023/2024 school year. The Fraser Institute score measures selected academic indicators. It is one starting point for research, not a complete assessment of teaching, student support, wellbeing or school fit.
UNDERSTAND THE COMPARISON
A useful starting point. A broader decision.
These lists order schools by their overall Fraser Institute score in the 2025 Ontario reports, using 2023/2024 results. The elementary report was published in January 2026 and the secondary report in November 2025. They are historical academic results, not 2026 test scores.
The Fraser Institute score measures selected academic indicators. It is one starting point for research, not a complete assessment of teaching, student support, wellbeing or school fit.
Coverage. We checked 200 rated schools located in Durham Region: 122 public elementary, 23 public secondary, 45 Catholic elementary and 10 Catholic secondary. Coverage includes English- and French-language schools across Durham’s municipalities, including Clarington. Public and Catholic schools are compared separately. Unrated schools are not treated as lower-rated schools.
Ties. Equal scores share a regional position. To display ten profiles, ties are ordered alphabetically by the current common school name, ignoring the French École prefix. A tied school outside the ten-profile selection is named on the relevant list; it is not academically lower-ranked.
Methodology source checked October 3, 2026.
Use the board’s current boundary and registration information, visit the school and discuss your child’s needs before making a school or home decision.
Sources & review notes
School details reviewed October 3, 2026. School information and academic results can change.
- Official school information Checked October 3, 2026
- Durham Catholic school directory Checked October 3, 2026
- School locator and grade information Checked October 3, 2026
- Fraser individual school record — identity and result Checked October 3, 2026
- Fraser Institute 2025 school report Checked October 3, 2026
Independently prepared by Offplan Canada. School and board names identify the sources; they do not imply endorsement of this website or of any development.