Largest Schools in Halton CDSB (2025)

Schools with the highest enrolment. Ranked by the Success Index (Canada) from official Canadian data; 58 schools in Halton CDSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.

#	School	Sector	Enrolment	Success Index (Canada)	Key result	Students
1	Bishop Paul Francis Reding Catholic Secondary School Milton · Secondary · Grades 9-12	Catholic	2,660	76.3 Top 25%	92% OSSLT pass rate	2,660
2	Holy Trinity Catholic Secondary School Oakville · Secondary · Grades 9-12	Catholic	1,775	70.0 Top 25%	88% OSSLT pass rate	1,775
3	St. Francis Xavier Catholic Secondary School Milton · Secondary · Grades 9-12	Catholic	1,770	58.1 Top 50%	85% OSSLT pass rate	1,770
4	Christ the King Catholic Secondary School Georgetown · Secondary · Grades 9-12	Catholic	1,545	63.2 Top 50%	84% OSSLT pass rate	1,545
5	St. Thomas Aquinas Catholic Secondary School Oakville · Secondary · Grades 9-12	Catholic	1,310	73.9 Top 25%	89% OSSLT pass rate	1,310
6	St. Ignatius of Loyola Catholic Secondary School Oakville · Secondary · Grades 9-12	Catholic	1,300	70.3 Top 25%	84% OSSLT pass rate	1,300
7	Corpus Christi Catholic Secondary School Burlington · Secondary · Grades 9-12	Catholic	1,140	88.8 Top 5%	92% OSSLT pass rate	1,140
8	Assumption Catholic Secondary School Burlington · Secondary · Grades 9-12	Catholic	1,070	71.2 Top 25%	89% OSSLT pass rate	1,070
9	Notre Dame Catholic Secondary School Burlington · Secondary · Grades 9-12	Catholic	1,030	74.8 Top 25%	88% OSSLT pass rate	1,030
10	St. Kateri Tekakwitha Catholic Secondary Catholic School Milton · Secondary · Grades 9-12	Catholic	880	79.3 Top 25%	89% OSSLT pass rate	880
11	Guardian Angels Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	780	57.1 Top 50%	74.3% EQAO Grade 6	780
12	St. Scholastica Catholic Elementary School Town Of Milton · Elementary · Grades JK-8	Catholic	755	58.3 Top 50%	71.3% EQAO Grade 6	755
13	St. Benedict Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	745	57.0 Top 50%	70.7% EQAO Grade 6	745
14	St. Catherine of Alexandria Catholic Elementary School Georgetown · Elementary · Grades JK-8	Catholic	740	63.2 Top 50%	72.7% EQAO Grade 6	740
15	St. Anthony of Padua Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	725	70.4 Top 25%	83% EQAO Grade 6	725
16	Queen of Heaven Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	720	49.0 Lower 50%	73.3% EQAO Grade 6	720
17	St. Brigid Catholic Elementary School Georgetown · Elementary · Grades JK-8	Catholic	685	67.3 Top 25%	81% EQAO Grade 6	685
18	St. Mary Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	675	80.6 Top 10%	90.7% EQAO Grade 6	675
19	St. Anne Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	660	73.9 Top 25%	75% EQAO Grade 6	660
20	St. Andrew Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	660	67.4 Top 25%	90.3% EQAO Grade 6	660
21	Lumen Christi Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	640	59.2 Top 50%	72.3% EQAO Grade 6	640
22	St. Nicholas Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	625	73.8 Top 25%	85.3% EQAO Grade 6	625
23	St. Peter Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	595	61.2 Top 50%	80% EQAO Grade 6	595
24	Sacred Heart of Jesus Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	575	86.5 Top 5%	92.7% EQAO Grade 6	575
25	St. Timothy Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	575	84.2 Top 10%	87.3% EQAO Grade 6	575
26	St. Dominic Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	555	82.5 Top 10%	99% EQAO Grade 6	555
27	Our Lady of Fatima Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	545	73.6 Top 25%	83% EQAO Grade 6	545
28	St. Gabriel Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	545	63.8 Top 50%	80.3% EQAO Grade 6	545
29	Holy Rosary (Milton) Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	530	53.2 Top 50%	69% EQAO Grade 6	530
30	St. Gregory the Great Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	500	73.9 Top 25%	85% EQAO Grade 6	500
31	Holy Cross Catholic Elementary School Halton Hills · Elementary · Grades JK-8	Catholic	465	53.1 Top 50%	73% EQAO Grade 6	465
32	St. Mark Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	450	70.3 Top 25%	78.3% EQAO Grade 6	450
33	St. Francis of Assisi Catholic Elementary School Georgetown · Elementary · Grades JK-8	Catholic	440	61.9 Top 50%	67.7% EQAO Grade 6	440
34	St. Paul Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	430	80.9 Top 10%	85.3% EQAO Grade 6	430
35	St. Marguerite d'Youville Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	425	87.7 Top 5%	90.3% EQAO Grade 6	425
36	Canadian Martyrs Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	425	87.5 Top 5%	86% EQAO Grade 6	425
37	St. Cecilia Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	415	46.7 Lower 50%	67.7% EQAO Grade 6	415
38	Our Lady of Peace Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	400	84.3 Top 10%	84.7% EQAO Grade 6	400
39	St. Raphael Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	380	85.3 Top 5%	88.7% EQAO Grade 6	380
40	Holy Rosary (Burlington) Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	370	75.1 Top 25%	84.7% EQAO Grade 6	370
41	St. Joseph (Acton) Catholic Elementary School Acton · Elementary · Grades JK-8	Catholic	360	48.8 Lower 50%	66.7% EQAO Grade 6	360
42	St. Matthew Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	330	85.2 Top 5%	92.3% EQAO Grade 6	330
43	Ascension Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	325	82.8 Top 10%	80.7% EQAO Grade 6	325
44	St. Patrick Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	325	69.1 Top 25%	77.3% EQAO Grade 6	325
45	St. John (Burlington) Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	325	64.6 Top 50%	82.3% EQAO Grade 6	325
46	St. Elizabeth Seton Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	320	74.3 Top 25%	77.3% EQAO Grade 6	320
47	Our Lady of Victory Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	320	48.0 Lower 50%	73.3% EQAO Grade 6	320
48	St. Christopher Catholic Elementary School Burlington · Elementary · Grades JK-8	Catholic	310	76.9 Top 25%	81.7% EQAO Grade 6	310
49	St. John Paul II Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	305	55.5 Top 50%	68.3% EQAO Grade 6	305
50	St. Joan of Arc Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	295	75.1 Top 25%	86.7% EQAO Grade 6	295
51	St. Michael Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	290	73.1 Top 25%	78.7% EQAO Grade 6	290
52	St. Teresa of Calcutta Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	280	61.8 Top 50%	74% EQAO Grade 6	280
53	St. Bernadette Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	255	62.5 Top 50%	78.3% EQAO Grade 6	255
54	St. Veronica Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	235	77.2 Top 25%	84.7% EQAO Grade 6	235
55	Holy Family Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	190	76.2 Top 25%	80.7% EQAO Grade 6	190
56	St. Luke Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	170	65.5 Top 50%	76.7% EQAO Grade 6	170
57	St. Vincent Catholic Elementary School Oakville · Elementary · Grades JK-8	Catholic	135	56.2 Top 50%	76% EQAO Grade 6	135
58	St. Josephine Bakhita Catholic Elementary School Milton · Elementary · Grades JK-8	Catholic	110	52.2 Top 50%	75% EQAO Grade 3	110

Bishop Paul Francis Reding Catholic Secondary School in Milton leads the 2025 list of largest schools in Halton CDSB with Enrolment 2,660. Of the 58 schools shown, 58 are catholic.

For the full picture see the wider Ontario largest schools rankings, every school on the Halton CDSB page, or the comparison tool to put a shortlist side by side.

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Frequently asked questions

What is the best largest school in Halton CDSB?

Bishop Paul Francis Reding Catholic Secondary School in Milton, Ontario ranks first among largest schools in Halton CDSB with Enrolment 2,660 (Enrolment: 2,660).

How are largest schools in Halton CDSB ranked?

Schools with the highest enrolment. Only schools eligible for the Success Index (Canada) are included; the index is shown alongside for context.

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.