St Mary's High School
40 Central Ave · Brockville · K6V4N5 · CDSB of Eastern Ontario
Brockville and its 3 km edge have 4 secondary schools; St Mary's High School is one. Every school in and around Brockville →
What stands out about St Mary's High School
- A small secondary school: 385 students, against a middle of 810 in Ontario.
- Its results sit in the middle fifth in Ontario, averaged over its measures.
- On Grade 9 math it reaches 49%, below the 55% in Ontario.
- Catholic and English-language, under CDSB of Eastern Ontario.
- The only English Catholic secondary school in or within 3 km of Brockville.
How St Mary's High School does on Ontario’s tests
EQAO’s Grade 3, 6 and 9 assessments and the literacy test, 2024-25: each school against every school in Ontario.
On average across 2 reported measures of 2, St Mary's High School is in the middle fifth in Ontario.
| Measure | Here | Middle, Ontario | Band | 3-year change |
|---|---|---|---|---|
| Grade 9 math | 49% | 55% | Fourth fifth | +2 |
| Literacy test (OSSLT), first try | 93% | 85% | Top fifth | +3 |
N/R: EQAO doesn’t report groups too small to keep students anonymous. The three-year change is in percentage points, as the ministry publishes it.
Where St Mary's High School sits among the province’s schools
The middle fifth in Ontario is where St Mary's High School’s results put it among the province’s schools. That is the comparison the published figures allow; a letter is something we give towns, not single schools.
The letter belongs to Brockville: its School Grade weighs St Mary's High School with every other school around it.
Getting a place at St Mary's High School
Ask the board first. It holds the enrolment list and points each street to its own school; out-of-area requests go ahead only with space to spare.
Families who aren’t Catholic can usually choose a Catholic high school, though rarely a Catholic elementary one.
The provinces’ education acts and the boards’ own admission policies; check with the board for a given address.
Side by side with the nearest secondary schools
Its level’s nearest schools, measured as the crow flies.
2 of the 5 nearest secondary schools have more students than St Mary's High School.
| School | System | Language | Students | Band | Away |
|---|---|---|---|---|---|
| St Mary's High School | English Catholic | English | 385 | Middle fifth | |
| Thousand Islands Secondary School | English public | English | 640 | Middle fifth | 0.7 km |
| Brockville Collegiate Institute | English public | English | 425 | Middle fifth | 1.2 km |
| École secondaire catholique Ange-Gabriel | French Catholic | French | 80 | Top fifth | 2.2 km |
| South Grenville District High School | English public | English | 370 | Bottom fifth | 19 km |
| Athens District High School | English public | English | 160 | Bottom fifth | 20 km |
Secondary schools near St Mary's High School
Nearest first, as the crow flies, up to 25 km. Each school’s own admission policy decides who gets a place.
Questions about St Mary's High School
Who runs St Mary's High School?
CDSB of Eastern Ontario: St Mary's High School is one of its schools (English Catholic).
What language does St Mary's High School teach in?
English.
How do pupils get a place at St Mary's High School?
Start with the board for the system you want; your address sets the school.
Which schools of the same kind are near St Mary's High School?
Nearest of all: Thousand Islands Secondary School (0.7 km), Brockville Collegiate Institute (1.2 km) and École secondaire catholique Ange-Gabriel (2.2 km).
Sources: Ontario Ministry of Education, School Information Finder 2024–25 and school contact list (Open Government Licence – Ontario) · Ontario Ministry of Education, School Information Finder 2024–25 (EQAO results; N/R where groups are too small). Open Government Licence – Ontario. · map tiles © OpenStreetMap contributors. Under the Statistics Canada Open Licence.
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).