St Mary's High School vs Thousand Islands Intermediate School
A head-to-head comparison of two schools in Ontario, Canada, 724 m apart, using official Canadian 2025 data. The better value in each row is highlighted.
St Mary's High School
Brockville · Catholic secondary · Grades 9-12
385 students
Thousand Islands Intermediate School
Brockville · Public elementary · Grades 7-8
220 students
| Measure | St Mary's High School Brockville, Ontario | Thousand Islands Intermediate School Brockville, Ontario |
|---|---|---|
| Success Index (Canada) | 58 Top 50% | 55 Top 50% |
| Province rank | #295 of 766 | #1740 of 3,871 |
| National rank | #295 of 766 | #1740 of 3,871 |
| Sector | Catholic | Public |
| Type | Secondary | Elementary |
| Year range | Grades 9-12 | Grades 7-8 |
| Students | 385 | 220 |
| Enrolment | 385 | 220 |
| EQAO Grade 3 | – | – |
| EQAO Grade 6 | – | – |
| EQAO Grade 9 maths | 49% | – |
| OSSLT pass rate | 93% | – |
| Low-income households | 5% | 5% |
| Parents without a credential | 5% | 5% |
| First language not English | 5% | 0% |
| Special education | 30% | 35% |
| Identified as gifted | 0% | 0% |
| FSA literacy score | – | – |
| FSA numeracy score | – | – |
| FSA Grade 4 literacy score | – | – |
| FSA Grade 4 numeracy score | – | – |
| FSA Grade 7 literacy score | – | – |
| FSA Grade 7 numeracy score | – | – |
| city or town | Brockville | Brockville |
| province | Ontario | Ontario |
| Website | www.stmarychs.cdsbeo.on.ca | tiss.ucdsb.on.ca/ |
The verdict
- •St Mary's High School scores higher on the Success Index (Canada) (58.4 vs 54.6).
- •St Mary's High School is the larger school with 385 students compared with 220.
- •St Mary's High School is a catholic school while Thousand Islands Intermediate School is a public school, so fees and admission rules differ.
The Success Index (Canada) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
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Frequently asked questions
Is St Mary's High School better than Thousand Islands Intermediate School?
On the Success Index (Canada), St Mary's High School ranks higher (58.4 vs 54.6 out of 100). The index is built from published results and context data, not from teaching quality or fit, so visit both schools before deciding.
How far apart are St Mary's High School and Thousand Islands Intermediate School?
About 724 m in a straight line, between Brockville and Brockville in Ontario.
Which has the better Enrolment?
St Mary's High School: 385. Thousand Islands Intermediate School: 220. Students enrolled in the latest published year.
How do St Mary's High School and Thousand Islands Intermediate School rank in Ontario?
St Mary's High School is 295th of 766 and Thousand Islands Intermediate School is 1740th of 3,871 among secondary schools in Ontario on the 2025 Success Index (Canada).