St Mary's High School
🇨🇦 Official data · 2025Owen Sound, Ontario N4K1X2 · Bruce-Grey CDSB
#589 of 766 secondary schools in Ontario
#589 of 766 nationally
About St Mary's High School
St Mary's High School is a catholic secondary located in Owen Sound, in the Bruce-Grey CDSB school board or district of Ontario, Canada. It caters for Grades 9-12. In 2025 it enrolled 1,035 students. Publicly funded Catholic (separate) school boards in Ontario; free to attend.
Its Success Index (Canada) is 29.6 out of 100, placing it in the lower 50% of secondary schools in Canada and 589th of 766 ranked secondary schools in Ontario. Its strongest component is community advantage (fewer low-income households) (41th percentile), and its weakest is eqao grade 9 mathematics (26th percentile).
Other published figures: enrolment 1,035; first language not english 4%; special education 17%; identified as gifted 0%.
There are 15 schools in Owen Sound; St Mary's High School ranks 5th of 9 scored schools there.
Success Index (Canada) breakdown
Each component is a percentile against secondary schools across Canada.
- EQAO Grade 3 (reading, writing, maths) (20%)–
- EQAO Grade 6 (reading, writing, maths) (25%)–
- EQAO Grade 9 mathematics (25%)44%
- OSSLT first-attempt pass rate (20%)80%
- FSA literacy score (25%)–
- FSA numeracy score (25%)–
- Community advantage (fewer low-income households) (10%)10%
- Parent education (fewer parents without a credential) (10%)6%
The Success Index (Canada) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for St Mary's High School by the official sources.
- Enrolment
- 1,035
- Students enrolled in the latest published year.
- EQAO Grade 9 maths
- 44%
- % at or above the provincial standard in Grade 9 mathematics.
- OSSLT pass rate
- 80%
- % passing the Grade 10 literacy test on the first attempt.
- Low-income households
- 10%
- % of students living in low-income households.
- Parents without a credential
- 6%
- % of students whose parents have no degree, diploma or certificate.
- First language not English
- 4%
- % of students whose first language is not English.
- Special education
- 17%
- % of students receiving special education services.
- Identified as gifted
- 0%
- % of students identified as gifted.
Free academic assessment
Is your child on track for EQAO and beyond?
Success Tutoring offers personalised English and math tutoring from Kindergarten to Grade 12. Start with a free online assessment and a clear plan for the year ahead.
- Personalised learning plan mapped to the Australian Curriculum
- English & Maths from Kindergarten to Year 12
- Flexible memberships, no lock-in contracts
- Centres across NSW, VIC, QLD, WA, SA and ACT
Schools near St Mary's High School
Closest schools by straight-line distance, with their Success Index (Canada).
Alexandra Community School
Owen Sound · Public elementary · Grades JK-8
315 students · 385 m away
École élémentaire catholique St-Dominique-Savio
Owen Sound · Catholic elementary · Grades JK-8
175 students · 1.3 km away
École secondaire catholique Saint-Dominique-Savio
Owen Sound · Catholic secondary · Grades 9-12
· 1.3 km away
East Ridge Community School
Owen Sound · Public elementary · Grades JK-8
805 students · 1.6 km away
Hillcrest Elementary School
Owen Sound · Public elementary · Grades JK-8
480 students · 1.8 km away
Notre Dame Catholic School
Owen Sound · Catholic elementary · Grades 1-8
570 students · 1.9 km away
Owen Sound District Secondary School Secondary School
Owen Sound · Public secondary · Grades 9-12
1,285 students · 2.1 km away
Keppel-Sarawak Elementary School
Owen Sound · Public elementary · Grades JK-6
455 students · 2.3 km away
St Basil's Separate School
Owen Sound · Catholic elementary · Grades JK-2
315 students · 2.4 km away
Similar schools
Catholic secondary schools in Ontario with a comparable Enrolment.
All Saints Catholic High School
Kanata · Catholic secondary · Grades 9-12
1,035 students
St. Peter Catholic Secondary School
Peterborough · Catholic secondary · Grades 9-12
1,035 students
Notre Dame Catholic Secondary School
Burlington · Catholic secondary · Grades 9-12
1,030 students
St Patrick High School
Thunder Bay · Catholic secondary · Grades 9-12
1,030 students
St Ignatius High School
Thunder Bay · Catholic secondary · Grades 9-12
1,045 students
Marshall McLuhan Catholic Secondary School
Toronto · Catholic secondary · Grades 9-12
1,050 students
Frequently asked questions
Is St Mary's High School a good school?
St Mary's High School has a Success Index (Canada) of 29.6 out of 100 (Lower 50% of secondary schools in Canada) and ranks #589 of 766 in Ontario. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does St Mary's High School rank in Ontario?
St Mary's High School ranks #589 of 766 secondary schools in Ontario and #589 of 766 nationally on the Success Index (Canada) (2025 data).
How many students attend St Mary's High School?
St Mary's High School had 1,035 students in 2025.
Is St Mary's High School a elementary school or a secondary school?
St Mary's High School is classified as a secondary covering Grades 9-12. It is a catholic school.
What other schools are near St Mary's High School?
There are 9 schools within 15 km of St Mary's High School; they are listed on this page with their Success Index (Canada) and distance, and can be compared side by side.