Thousand Islands Secondary School
🇨🇦 Official data · 2025Brockville, Ontario K6V3H1 · Upper Canada DSB
#452 of 766 secondary schools in Ontario
#452 of 766 nationally
About Thousand Islands Secondary School
Thousand Islands Secondary School is a public secondary located in Brockville, in the Upper Canada DSB school board or district of Ontario, Canada. It caters for Grades 9-12. In 2025 it enrolled 640 students. Publicly funded schools run by public school boards or districts; free to attend.
Its Success Index (Canada) is 43.5 out of 100, placing it in the lower 50% of secondary schools in Canada and 452nd of 766 ranked secondary schools in Ontario. Its strongest component is osslt first-attempt pass rate (65th percentile), and its weakest is community advantage (fewer low-income households) (28th percentile).
Other published figures: enrolment 640; first language not english 3%; special education 38%; identified as gifted 1%.
There are 15 schools in Brockville; Thousand Islands Secondary School ranks 9th of 14 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%)46%
- OSSLT first-attempt pass rate (20%)89%
- FSA literacy score (25%)–
- FSA numeracy score (25%)–
- Community advantage (fewer low-income households) (10%)11%
- Parent education (fewer parents without a credential) (10%)4%
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 Thousand Islands Secondary School by the official sources.
- Enrolment
- 640
- Students enrolled in the latest published year.
- EQAO Grade 9 maths
- 46%
- % at or above the provincial standard in Grade 9 mathematics.
- OSSLT pass rate
- 89%
- % passing the Grade 10 literacy test on the first attempt.
- Low-income households
- 11%
- % of students living in low-income households.
- Parents without a credential
- 4%
- % of students whose parents have no degree, diploma or certificate.
- First language not English
- 3%
- % of students whose first language is not English.
- Special education
- 38%
- % of students receiving special education services.
- Identified as gifted
- 1%
- % of students identified as gifted.
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Schools near Thousand Islands Secondary School
Closest schools by straight-line distance, with their Success Index (Canada).
Thousand Islands Intermediate School
Brockville · Public elementary · Grades 7-8
220 students · 10 m away
Vanier Public School
Brockville · Public elementary · Grades JK-6
250 students · 619 m away
St Mary's Separate School
Brockville · Catholic elementary · Grades 7-8
175 students · 713 m away
St Mary's High School
Brockville · Catholic secondary · Grades 9-12
385 students · 714 m away
Westminster Public School
Brockville · Public elementary · Grades JK-6
370 students · 820 m away
St John Bosco Catholic School
Brockville · Catholic elementary · Grades JK-6
260 students · 875 m away
École intermédiaire catholique Académie catholique Ange-Gabriel
Brockville · Catholic elementary · Grades 7-8
· 1.5 km away
École secondaire catholique Ange-Gabriel
Brockville · Catholic secondary · Grades 9-12
80 students · 1.5 km away
École élémentaire Académie catholique Ange-Gabriel
Brockville · Catholic elementary · Grades JK-6
220 students · 1.6 km away
St Francis Xavier Separate School
Brockville · Catholic elementary · Grades JK-6
80 students · 1.9 km away
Similar schools
Public secondary schools in Ontario with a comparable Enrolment.
Timmins High and Vocational School
Timmins · Public secondary · Grades 9-12
640 students
Emery Collegiate Institute
North York · Public secondary · Grades 9-12
640 students
Laura Secord Secondary School
St Catharines · Public secondary · Grades 9-12
635 students
Cayuga Secondary School
Cayuga · Public secondary · Grades 9-12
635 students
Parkdale Collegiate Institute
Toronto · Public secondary · Grades 9-12
635 students
Winston Churchill Collegiate Institute
Toronto · Public secondary · Grades 9-12
645 students
Frequently asked questions
Is Thousand Islands Secondary School a good school?
Thousand Islands Secondary School has a Success Index (Canada) of 43.5 out of 100 (Lower 50% of secondary schools in Canada) and ranks #452 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 Thousand Islands Secondary School rank in Ontario?
Thousand Islands Secondary School ranks #452 of 766 secondary schools in Ontario and #452 of 766 nationally on the Success Index (Canada) (2025 data).
How many students attend Thousand Islands Secondary School?
Thousand Islands Secondary School had 640 students in 2025.
Is Thousand Islands Secondary School a elementary school or a secondary school?
Thousand Islands Secondary School is classified as a secondary covering Grades 9-12. It is a public school.
What other schools are near Thousand Islands Secondary School?
There are 10 schools within 15 km of Thousand Islands Secondary School; they are listed on this page with their Success Index (Canada) and distance, and can be compared side by side.