Thornlea Secondary School
🇨🇦 Official data · 2025Thornhill, Ontario L3T4N4 · York Region DSB
#140 of 766 secondary schools in Ontario
#140 of 766 nationally
About Thornlea Secondary School
Thornlea Secondary School is a public secondary located in Thornhill, in the York Region DSB school board or district of Ontario, Canada. It caters for Grades 9-12. In 2025 it enrolled 1,170 students. Publicly funded schools run by public school boards or districts; free to attend.
Its Success Index (Canada) is 73.1 out of 100, placing it in the top 25% of secondary schools in Canada and 140th of 766 ranked secondary schools in Ontario. Its strongest component is eqao grade 9 mathematics (91th percentile), and its weakest is community advantage (fewer low-income households) (28th percentile).
Other published figures: enrolment 1,170; first language not english 57%; special education 12%; identified as gifted 1%.
There are 63 schools in Thornhill; Thornlea Secondary School ranks 17th of 34 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%)78%
- OSSLT first-attempt pass rate (20%)90%
- FSA literacy score (25%)–
- FSA numeracy score (25%)–
- Community advantage (fewer low-income households) (10%)11%
- Parent education (fewer parents without a credential) (10%)1%
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 Thornlea Secondary School by the official sources.
- Enrolment
- 1,170
- Students enrolled in the latest published year.
- EQAO Grade 9 maths
- 78%
- % at or above the provincial standard in Grade 9 mathematics.
- OSSLT pass rate
- 90%
- % 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
- 1%
- % of students whose parents have no degree, diploma or certificate.
- First language not English
- 57%
- % of students whose first language is not English.
- Special education
- 12%
- % of students receiving special education services.
- Identified as gifted
- 1%
- % of students identified as gifted.
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Schools near Thornlea Secondary School
Closest schools by straight-line distance, with their Success Index (Canada).
Willowbrook Public School
Thornhill · Public elementary · Grades JK-8
355 students · 405 m away
Stornoway Crescent Public School
Thornhill · Public elementary · Grades JK-8
65 students · 650 m away
Woodland Public School
Thornhill · Public elementary · Grades 1-8
220 students · 992 m away
St Anthony Catholic Elementary School
Thornhill · Catholic elementary · Grades JK-8
195 students · 996 m away
St Rene Goupil-St Luke Catholic Elementary School
Thornhill · Catholic elementary · Grades JK-8
245 students · 1.4 km away
Baythorn Public School
Thornhill · Public elementary · Grades JK-8
550 students · 1.5 km away
Johnsview Village Public School
Thornhill · Public elementary · Grades JK-8
230 students · 1.5 km away
Adrienne Clarkson Public School
Richmond Hill · Public elementary · Grades 1-8
535 students · 1.9 km away
St Robert Catholic High School
Thornhill · Catholic secondary · Grades 9-12
1,705 students · 2.0 km away
Bayview Fairways Public School
Thornhill · Public elementary · Grades JK-8
310 students · 2.0 km away
Similar schools
Public secondary schools in Ontario with a comparable Enrolment.
Cedarbrae Collegiate Institute
Scarborough · Public secondary · Grades 9-12
1,170 students
Anderson Collegiate and Vocational Institute
Whitby · Public secondary · Grades 9-12
1,175 students
Thomas A Blakelock High School
Oakville · Public secondary · Grades 9-12
1,165 students
Bramalea Secondary School
Brampton · Public secondary · Grades 9-12
1,165 students
Ancaster High School
Ancaster · Public secondary · Grades 9-12
1,180 students
Bowmanville High School
Bowmanville · Public secondary · Grades 9-12
1,180 students
Frequently asked questions
Is Thornlea Secondary School a good school?
Thornlea Secondary School has a Success Index (Canada) of 73.1 out of 100 (Top 25% of secondary schools in Canada) and ranks #140 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 Thornlea Secondary School rank in Ontario?
Thornlea Secondary School ranks #140 of 766 secondary schools in Ontario and #140 of 766 nationally on the Success Index (Canada) (2025 data).
How many students attend Thornlea Secondary School?
Thornlea Secondary School had 1,170 students in 2025.
Is Thornlea Secondary School a elementary school or a secondary school?
Thornlea Secondary School is classified as a secondary covering Grades 9-12. It is a public school.
What other schools are near Thornlea Secondary School?
There are 10 schools within 15 km of Thornlea Secondary School; they are listed on this page with their Success Index (Canada) and distance, and can be compared side by side.