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Best secondary schools in York Region DSB (2025)

Secondary (high) schools and combined schools. Ranked by the Success Index (Canada) from official Canadian data; 33 schools in York Region DSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.

  1. 1
    86
    Stephen Lewis Secondary SchoolThornhill · Public Secondary92% OSSLT pass rate · 1,730 students
  2. 2
    85
    Bill Crothers Secondary SchoolUnionville · Public Secondary98% OSSLT pass rate · 1,575 students
  3. 3
    84
    Dr G W Williams Secondary SchoolAurora · Public Secondary94% OSSLT pass rate · 1,515 students
  4. 4
    84
    Newmarket High SchoolNewmarket · Public Secondary97% OSSLT pass rate · 1,515 students
  5. 5
    82
    Bill Hogarth Secondary SchoolMarkham · Public Secondary97% OSSLT pass rate · 2,055 students
  6. 6
    81
    Richmond Hill High SchoolRichmond Hill · Public Secondary96% OSSLT pass rate · 1,635 students
  7. 7
    81
    Bayview Secondary SchoolRichmond Hill · Public Secondary95% OSSLT pass rate · 1,940 students
  8. 8
    81
    Bur Oak Secondary SchoolMarkham · Public Secondary96% OSSLT pass rate · 1,865 students
  9. 9
    80
    Aurora High SchoolAurora · Public Secondary93% OSSLT pass rate · 1,020 students
  10. 10
    80
    Hodan Nalayeh Secondary SchoolThornhill · Public Secondary91% OSSLT pass rate · 1,090 students
  11. 11
    80
    Pierre Elliott Trudeau High SchoolMarkham · Public Secondary97% OSSLT pass rate · 1,865 students
  12. 12
    79
    Markville Secondary SchoolMarkham · Public Secondary96% OSSLT pass rate · 1,575 students
  13. 13
    79
    Richmond Green Secondary SchoolRichmond Hill · Public Secondary91% OSSLT pass rate · 1,160 students
  14. 14
    77
    Markham District High SchoolMarkham · Public Secondary92% OSSLT pass rate · 1,415 students
  15. 15
    76
    Westmount Collegiate InstituteThornhill · Public Secondary90% OSSLT pass rate · 1,140 students
  16. 16
    75
    Alexander MacKenzie High SchoolRichmond Hill · Public Secondary91% OSSLT pass rate · 1,415 students
  17. 17
    74
    Maple High SchoolMaple · Public Secondary93% OSSLT pass rate · 1,590 students
  18. 18
    73
    Thornlea Secondary SchoolThornhill · Public Secondary90% OSSLT pass rate · 1,170 students
  19. 19
    72
    Emily Carr Secondary SchoolWoodbridge · Public Secondary93% OSSLT pass rate · 945 students
  20. 20
    72
    Tommy Douglas Secondary SchoolWoodbridge · Public Secondary92% OSSLT pass rate · 1,645 students
  21. 21
    70
    Stouffville District Secondary SchoolStouffville · Public Secondary91% OSSLT pass rate · 1,300 students
  22. 22
    68
    Unionville High SchoolUnionville · Public Secondary90% OSSLT pass rate · 1,865 students
  23. 23
    65
    Sir William Mulock Secondary SchoolNewmarket · Public Secondary89% OSSLT pass rate · 1,190 students
  24. 24
    62
    Thornhill Secondary SchoolThornhill · Public Secondary88% OSSLT pass rate · 940 students
  25. 25
    60
    Milliken Mills High SchoolUnionville · Public Secondary90% OSSLT pass rate · 1,595 students
  26. 26
    59
    King City Secondary SchoolKing City · Public Secondary87% OSSLT pass rate · 1,010 students
  27. 27
    55
    Middlefield Collegiate InstituteMarkham · Public Secondary86% OSSLT pass rate · 1,500 students
  28. 28
    55
    Woodbridge CollegeWoodbridge · Public Secondary91% OSSLT pass rate · 655 students
  29. 29
    46
    Huron Heights Secondary SchoolNewmarket · Public Secondary85% OSSLT pass rate · 1,295 students
  30. 30
    44
    Dr John M Denison Secondary SchoolNewmarket · Public Secondary84% OSSLT pass rate · 1,000 students
  31. 31
    39
    Langstaff Secondary SchoolRichmond Hill · Public Secondary81% OSSLT pass rate · 635 students
  32. 32
    28
    Keswick High SchoolKeswick · Public Secondary77% OSSLT pass rate · 960 students
  33. 33
    23
    Sutton District High SchoolSutton · Public Secondary66% OSSLT pass rate · 470 students

Stephen Lewis Secondary School in Thornhill leads the 2025 list of secondary schools in York Region DSB with a Success Index (Canada) of 86.2. Of the 33 schools shown, 33 are public.

For the full picture see the wider Ontario secondary schools rankings, every school on the York Region DSB 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 York Region DSB?

Stephen Lewis Secondary School in Thornhill, Ontario ranks first among secondary schools in York Region DSB with a Success Index (Canada) of 86.2 out of 100 (Enrolment: 1,730).

How are secondary schools in York Region DSB 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.