Best secondary schools in Newmarket (2025)
Secondary (high) schools and combined schools. Ranked by the Success Index (Canada) from official Canadian data; 5 schools in Newmarket, Ontario. Rank positions shown on each profile are within Canada and Ontario.
- 184Newmarket High SchoolNewmarket · Public Secondary97% OSSLT pass rate · 1,515 students
- 265Sir William Mulock Secondary SchoolNewmarket · Public Secondary89% OSSLT pass rate · 1,190 students
- 360Sacred Heart Catholic High SchoolNewmarket · Catholic Secondary85% OSSLT pass rate · 1,240 students
- 446Huron Heights Secondary SchoolNewmarket · Public Secondary85% OSSLT pass rate · 1,295 students
- 544Dr John M Denison Secondary SchoolNewmarket · Public Secondary84% OSSLT pass rate · 1,000 students
| # | School | Sector | Success Index (Canada) | Key result | Students |
|---|---|---|---|---|---|
| 1 | Newmarket High School Newmarket · Secondary · Grades 9-12 | Public | 84.1 Top 10% | 97% OSSLT pass rate | 1,515 |
| 2 | Sir William Mulock Secondary School Newmarket · Secondary · Grades 9-12 | Public | 65.2 Top 50% | 89% OSSLT pass rate | 1,190 |
| 3 | Sacred Heart Catholic High School Newmarket · Secondary · Grades 9-12 | Catholic | 59.8 Top 50% | 85% OSSLT pass rate | 1,240 |
| 4 | Huron Heights Secondary School Newmarket · Secondary · Grades 9-12 | Public | 45.7 Lower 50% | 85% OSSLT pass rate | 1,295 |
| 5 | Dr John M Denison Secondary School Newmarket · Secondary · Grades 9-12 | Public | 44.3 Lower 50% | 84% OSSLT pass rate | 1,000 |
Newmarket High School in Newmarket leads the 2025 list of secondary schools in Newmarket with a Success Index (Canada) of 84.1. Of the 5 schools shown, 4 are public, 1 are catholic.
For the full picture see the wider Ontario secondary schools rankings, every school on the Newmarket page, or the comparison tool to put a shortlist side by side.
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Frequently asked questions
What is the best secondary school in Newmarket?
Newmarket High School in Newmarket, Ontario ranks first among secondary schools in Newmarket with a Success Index (Canada) of 84.1 out of 100 (Enrolment: 1,515).
How are secondary schools in Newmarket ranked?
Each school's Success Index (Canada) combines 8 factors: eqao grade 3 (reading, writing, maths) (20%), eqao grade 6 (reading, writing, maths) (25%), eqao grade 9 mathematics (25%), osslt first-attempt pass rate (20%), fsa literacy score (25%), fsa numeracy score (25%), community advantage (fewer low-income households) (10%), parent education (fewer parents without a credential) (10%). Each factor is a percentile against schools of the same type across Canada. Schools with fewer than 60 students are excluded from rankings.
Are these 2025 rankings official?
No. They are computed by Success Tutoring from official Canadian data (Ontario – School information and student demographics; BC Data Catalogue – Foundation Skills Assessment). Provinces publish different assessments, so scores are comparable within a province, not between provinces.