Thornhill Secondary School
🇨🇦 Official data · 2025Thornhill, Ontario L3T2E5 · York Region DSB
#258 of 766 secondary schools in Ontario
#258 of 766 nationally
About Thornhill Secondary School
Thornhill 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 940 students. Publicly funded schools run by public school boards or districts; free to attend.
Its Success Index (Canada) is 62.0 out of 100, placing it in the top 50% of secondary schools in Canada and 258th of 766 ranked secondary schools in Ontario. Its strongest component is eqao grade 9 mathematics (78th percentile), and its weakest is community advantage (fewer low-income households) (17th percentile).
Other published figures: enrolment 940; first language not english 73%; special education 14%; identified as gifted 10%.
There are 63 schools in Thornhill; Thornhill Secondary School ranks 28th 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%)68%
- OSSLT first-attempt pass rate (20%)88%
- FSA literacy score (25%)–
- FSA numeracy score (25%)–
- Community advantage (fewer low-income households) (10%)14%
- Parent education (fewer parents without a credential) (10%)2%
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 Thornhill Secondary School by the official sources.
- Enrolment
- 940
- Students enrolled in the latest published year.
- EQAO Grade 9 maths
- 68%
- % at or above the provincial standard in Grade 9 mathematics.
- OSSLT pass rate
- 88%
- % passing the Grade 10 literacy test on the first attempt.
- Low-income households
- 14%
- % of students living in low-income households.
- Parents without a credential
- 2%
- % of students whose parents have no degree, diploma or certificate.
- First language not English
- 73%
- % of students whose first language is not English.
- Special education
- 14%
- % of students receiving special education services.
- Identified as gifted
- 10%
- % of students identified as gifted.
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Schools near Thornhill Secondary School
Closest schools by straight-line distance, with their Success Index (Canada).
Thornhill Public School
Thornhill · Public elementary · Grades JK-8
260 students · 360 m away
E J Sand Public School
Thornhill · Public elementary · Grades JK-8
415 students · 716 m away
Henderson Avenue Public School
Thornhill · Public elementary · Grades JK-8
340 students · 1.1 km away
Yorkhill Elementary School
Thornhill · Public elementary · Grades JK-8
345 students · 1.5 km away
Lillian Public School
North York · Public elementary · Grades JK-5
315 students · 1.6 km away
Brebeuf College School
Toronto · Catholic secondary · Grades 9-12
645 students · 1.6 km away
Woodland Public School
Thornhill · Public elementary · Grades 1-8
220 students · 1.7 km away
St Agnes Catholic School
North York · Catholic elementary · Grades JK-8
240 students · 1.9 km away
Baythorn Public School
Thornhill · Public elementary · Grades JK-8
550 students · 1.9 km away
Newtonbrook Secondary School
Toronto · Public secondary · Grades 9-12
870 students · 1.9 km away
Similar schools
Public secondary schools in Ontario with a comparable Enrolment.
Superior Heights Collegiate and Vocational School
Sault Ste. Marie · Public secondary · Grades 9-12
940 students
Paris District High School
Paris · Public secondary · Grades 9-12
945 students
College Avenue Secondary School
Woodstock · Public secondary · Grades 9-12
935 students
Rosedale Heights School of the Arts
Toronto · Public secondary · Grades 9-12
945 students
West Hill Collegiate Institute
Toronto · Public secondary · Grades 9-12
945 students
Emily Carr Secondary School
Woodbridge · Public secondary · Grades 9-12
945 students
Frequently asked questions
Is Thornhill Secondary School a good school?
Thornhill Secondary School has a Success Index (Canada) of 62.0 out of 100 (Top 50% of secondary schools in Canada) and ranks #258 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 Thornhill Secondary School rank in Ontario?
Thornhill Secondary School ranks #258 of 766 secondary schools in Ontario and #258 of 766 nationally on the Success Index (Canada) (2025 data).
How many students attend Thornhill Secondary School?
Thornhill Secondary School had 940 students in 2025.
Is Thornhill Secondary School a elementary school or a secondary school?
Thornhill Secondary School is classified as a secondary covering Grades 9-12. It is a public school.
What other schools are near Thornhill Secondary School?
There are 10 schools within 15 km of Thornhill Secondary School; they are listed on this page with their Success Index (Canada) and distance, and can be compared side by side.