Sir William Mulock Secondary School

Public · Secondary

705 Columbus Way, Newmarket, ON, L3X2M7

+1 (905) 967-1045

York Region District School Board

Official website

Grades 9-121,190 studentsopen

School information

Grades served: 9-12
Enrollment: 1,190
School organization: York Region District School Board

Academic Performance

Scores compare similar schools only within Ontario, never across Canada.

secondary

6.8 / 10

Grade 9 Mathematics: 59%
Grade 10 OSSLT, first attempt: 89%

How Ontario assesses schools

EQAO, run by Education Quality and Accountability Office.

Ontario publishes provincial assessment results for individual schools.

Grades tested: 3, 6, 9, 10
Subjects: Reading, Writing, Mathematics, Literacy
Most recent year: 2024-2025

Results for this school

Secondary

Results published

A school without a score is not a school with a low score. Scores are only ever compared within Ontario and within the same stage — never between provinces, which use different tests.

Education Quality and Accountability Office

Enrolment over time

1,190 students in 2024-2025 — down 10% since 2011-2012. Roll as reported by Ontario, not a projection.

11–121,320
12–131,243
13–141,241
14–151,230
15–161,223
16–171,275
17–181,294
18–191,270
19–201,310
20–211,305
21–221,265
22–231,270
23–241,285
24–251,190

Some years are published as rounded or banded counts.

Programmes

Programmes Ontario lists for this school in 2025-2026. Only programmes the province publishes a register for can appear here, so this is not a full list of everything the school offers — and an absent programme does not mean it is not taught.