Largest Schools in York CDSB (2025)

Schools with the highest enrolment. Ranked by the Success Index (Canada) from official Canadian data; 100 schools in York CDSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.

#	School	Sector	Enrolment	Success Index (Canada)	Key result	Students
1	St Robert Catholic High School Thornhill · Secondary · Grades 9-12	Catholic	1,705	83.8 Top 10%	96% OSSLT pass rate	1,705
2	St Theresa of Lisieux Catholic High School Richmond Hill · Secondary · Grades 9-12	Catholic	1,590	88.0 Top 5%	97% OSSLT pass rate	1,590
3	St Augustine Catholic High School Markham · Secondary · Grades 9-12	Catholic	1,575	81.8 Top 10%	96% OSSLT pass rate	1,575
4	St Jean de Brebeuf Catholic High School Woodbridge · Secondary · Grades 9-12	Catholic	1,510	54.9 Top 50%	85% OSSLT pass rate	1,510
5	Father Bressani Catholic High School Woodbridge · Secondary · Grades 9-12	Catholic	1,405	76.2 Top 25%	91% OSSLT pass rate	1,405
6	Cardinal Carter Catholic Secondary School Aurora · Secondary · Grades 9-12	Catholic	1,375	77.0 Top 25%	93% OSSLT pass rate	1,375
7	Holy Cross Catholic Academy High School Woodbridge · Secondary · Grades 9-12	Catholic	1,295	60.4 Top 50%	79% OSSLT pass rate	1,295
8	St Brother André Catholic High School Markham · Secondary · Grades 9-12	Catholic	1,280	76.4 Top 25%	94% OSSLT pass rate	1,280
9	St Maximilian Kolbe High School Aurora · Secondary · Grades 9-12	Catholic	1,245	64.1 Top 50%	87% OSSLT pass rate	1,245
10	Sacred Heart Catholic High School Newmarket · Secondary · Grades 9-12	Catholic	1,240	59.8 Top 50%	85% OSSLT pass rate	1,240
11	Our Lady Queen of the World CA High School Richmond Hill · Secondary · Grades 9-12	Catholic	1,200	76.9 Top 25%	93% OSSLT pass rate	1,200
12	Father Michael McGivney Catholic High School Markham · Secondary · Grades 9-12	Catholic	1,170	69.1 Top 25%	91% OSSLT pass rate	1,170
13	St Elizabeth Catholic High School Thornhill · Secondary · Grades 9-12	Catholic	1,065	68.4 Top 25%	92% OSSLT pass rate	1,065
14	St Joan of Arc Catholic High School Maple · Secondary · Grades 9-12	Catholic	975	48.6 Lower 50%	82% OSSLT pass rate	975
15	Pope Francis Catholic Elementary School Kleinburg · Elementary · Grades JK-8	Catholic	900	52.9 Top 50%	71.3% EQAO Grade 6	900
16	St Justin Martyr Catholic Elementary School Unionville · Elementary · Grades JK-8	Catholic	675	80.1 Top 10%	97.7% EQAO Grade 6	675
17	St Mary Catholic Elementary School Nobleton · Elementary · Grades JK-8	Catholic	610	82.9 Top 10%	91.3% EQAO Grade 6	610
18	Guardian Angels Vaughan · Elementary · Grades JK-8	Catholic	605	65.6 Top 50%	82.3% EQAO Grade 6	605
19	Christ the King Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	595	80.5 Top 10%	91.7% EQAO Grade 6	595
20	St Joseph Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	585	75.6 Top 25%	84.3% EQAO Grade 6	585
21	St Mary of the Angels Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	570	75.6 Top 25%	87.3% EQAO Grade 6	570
22	Our Lady of Good Counsel Catholic Elementary School Sharon · Elementary · Grades JK-8	Catholic	555	45.9 Lower 50%	65.3% EQAO Grade 6	555
23	Blessed Trinity Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	550	47.6 Lower 50%	77% EQAO Grade 6	550
24	Canadian Martyrs Catholic Elementary School Newmarket · Elementary · Grades JK-8	Catholic	530	59.9 Top 50%	80.7% EQAO Grade 6	530
25	St Charles Garnier Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	525	73.4 Top 25%	88.3% EQAO Grade 6	525
26	St Joseph The Worker Catholic Elementary School Thornhill · Elementary · Grades JK-8	Catholic	525	64.6 Top 50%	84.3% EQAO Grade 6	525
27	Holy Name Catholic Elementary School King City · Elementary · Grades JK-8	Catholic	505	55.1 Top 50%	80% EQAO Grade 6	505
28	St Francis Xavier Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	505	52.7 Top 50%	79.7% EQAO Grade 6	505
29	St Elizabeth Seton Catholic Elementary School Newmarket · Elementary · Grades JK-8	Catholic	500	35.9 Lower 50%	76.7% EQAO Grade 6	500
30	St Cecilia Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	465	71.5 Top 25%	77% EQAO Grade 6	465
31	St Veronica Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	455	71.9 Top 25%	78% EQAO Grade 6	455
32	St Emily Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	435	68.1 Top 25%	76.7% EQAO Grade 6	435
33	St Stephen Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	435	54.6 Top 50%	71.3% EQAO Grade 6	435
34	Good Shepherd Catholic Elementary School East Gwillimbury · Elementary · Grades JK-8	Catholic	435	48.9 Lower 50%	73.7% EQAO Grade 6	435
35	Our Lady of Fatima Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	430	61.3 Top 50%	75.3% EQAO Grade 6	430
36	St. Katharine Drexel Catholic Elementary School Stouffville · Elementary · Grades 7-8	Catholic	420	76.3 Top 25%	420 Enrolment	420
37	St Michael the Archangel Catholic Elementary School Vaughan · Elementary · Grades JK-8	Catholic	410	74.7 Top 25%	85% EQAO Grade 6	410
38	Notre Dame Catholic Elementary School Newmarket · Elementary · Grades JK-8	Catholic	410	28.3 Lower 50%	68.7% EQAO Grade 6	410
39	Holy Spirit Catholic Elementary School Aurora · Elementary · Grades JK-8	Catholic	400	80.6 Top 10%	92% EQAO Grade 6	400
40	St Nicholas Catholic Elementary School Newmarket · Elementary · Grades JK-8	Catholic	400	69.8 Top 25%	88% EQAO Grade 6	400
41	St Marguerite D'Youville Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	385	62.1 Top 50%	89.3% EQAO Grade 6	385
42	San Lorenzo Ruiz Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	375	72.0 Top 25%	85.3% EQAO Grade 6	375
43	St Brendan Catholic School Stouffville · Elementary · Grades JK-8	Catholic	375	62.1 Top 50%	85.7% EQAO Grade 6	375
44	St Monica Catholic Elementary School Buttonville · Elementary · Grades JK-8	Catholic	370	73.0 Top 25%	92.3% EQAO Grade 6	370
45	Immaculate Conception Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	355	68.8 Top 25%	81% EQAO Grade 6	355
46	Father Frederick McGinn Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	355	68.0 Top 25%	80.3% EQAO Grade 6	355
47	St Benedict Catholic Elementary School Unionville · Elementary · Grades JK-8	Catholic	355	60.3 Top 50%	87.7% EQAO Grade 6	355
48	St Thomas Aquinas Catholic Elementary School Keswick · Elementary · Grades JK-6	Catholic	355	37.2 Lower 50%	69% EQAO Grade 6	355
49	St Gabriel the Archangel Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	355	35.3 Lower 50%	59% EQAO Grade 6	355
50	Our Lady Help of Christians Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	350	64.3 Top 50%	79.3% EQAO Grade 6	350
51	St Patrick Catholic Elementary School Schomberg · Elementary · Grades JK-8	Catholic	345	75.7 Top 25%	82.3% EQAO Grade 6	345
52	St Padre Pio Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	340	64.1 Top 50%	77% EQAO Grade 6	340
53	St Clement Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	335	87.1 Top 5%	90.3% EQAO Grade 6	335
54	Our Lady of the Rosary Catholic Elementary School Concord · Elementary · Grades JK-8	Catholic	335	37.3 Lower 50%	75.3% EQAO Grade 6	335
55	St Julia Billiart Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	325	81.9 Top 10%	84.3% EQAO Grade 6	325
56	St Margaret Mary Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	325	55.6 Top 50%	79.3% EQAO Grade 6	325
57	St Anne Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	320	79.9 Top 10%	92.7% EQAO Grade 6	320
58	St Mary Immaculate Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	320	79.7 Top 10%	90.7% EQAO Grade 6	320
59	St Mark Catholic Elementary School Stouffville · Elementary · Grades JK-8	Catholic	320	61.5 Top 50%	74.7% EQAO Grade 6	320
60	Our Lady of the Lake Catholic Academy High School Keswick · Secondary · Grades 9-12	Catholic	320	54.5 Top 50%	84% OSSLT pass rate	320
61	Light of Christ Catholic Elementary School Aurora · Elementary · Grades JK-8	Catholic	310	64.9 Top 50%	78% EQAO Grade 6	310
62	St Brigid Catholic Elementary School Stouffville · Elementary · Grades JK-8	Catholic	305	71.0 Top 25%	83% EQAO Grade 6	305
63	Holy Jubilee Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	305	41.0 Lower 50%	73.7% EQAO Grade 6	305
64	San Marco Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	290	55.5 Top 50%	71.7% EQAO Grade 6	290
65	St John XXIII Catholic Elementary School Unionville · Elementary · Grades JK-8	Catholic	290	42.6 Lower 50%	78.7% EQAO Grade 6	290
66	St Kateri Tekakwitha Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	275	69.5 Top 25%	81% EQAO Grade 6	275
67	St Gregory the Great Catholic Academy Woodbridge · Elementary · Grades JK-8	Catholic	275	59.3 Top 50%	81.3% EQAO Grade 6	275
68	Prince of Peace Catholic Elementary School Keswick · Elementary · Grades JK-6	Catholic	275	29.5 Lower 50%	46.7% EQAO Grade 6	275
69	St Peter Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	270	34.5 Lower 50%	68% EQAO Grade 6	270
70	St Andrew Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	265	75.0 Top 25%	82.3% EQAO Grade 6	265
71	St Michael Catholic Academy Thornhill · Elementary · Grades JK-8	Catholic	260	90.0 Top 5%	91% EQAO Grade 6	260
72	St Joseph Catholic Elementary School Aurora · Elementary · Grades JK-8	Catholic	260	89.4 Top 5%	92% EQAO Grade 6	260
73	Our Lady of Hope Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	260	76.7 Top 25%	90.3% EQAO Grade 6	260
74	St John Bosco Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	260	64.0 Top 50%	80.7% EQAO Grade 6	260
75	St Angela Merici Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	260	57.7 Top 50%	84% EQAO Grade 6	260
76	St Agnes of Assisi Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	255	73.0 Top 25%	85.7% EQAO Grade 6	255
77	St Edward Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	250	78.1 Top 25%	87.3% EQAO Grade 6	250
78	St Jerome Catholic Elementary School Aurora · Elementary · Grades JK-8	Catholic	250	75.0 Top 25%	84.3% EQAO Grade 6	250
79	St Patrick Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	250	52.6 Top 50%	84% EQAO Grade 6	250
80	St Rene Goupil-St Luke Catholic Elementary School Thornhill · Elementary · Grades JK-8	Catholic	245	73.6 Top 25%	92% EQAO Grade 6	245
81	St John Paul II Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	245	70.0 Top 25%	87.7% EQAO Grade 6	245
82	Father John Kelly Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	245	53.3 Top 50%	69.7% EQAO Grade 6	245
83	St James Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	245	43.6 Lower 50%	80.7% EQAO Grade 6	245
84	All Saints Catholic Elementary School Unionville · Elementary · Grades JK-8	Catholic	240	77.9 Top 25%	91.3% EQAO Grade 6	240
85	St Catherine of Siena Catholic Elementary School Woodbridge · Elementary · Grades JK-8	Catholic	240	50.6 Lower 50%	68.3% EQAO Grade 6	240
86	St Bernadette's Catholic Elementary School Sutton West · Elementary · Grades JK-6	Catholic	235	23.7 Lower 50%	54.3% EQAO Grade 6	235
87	Sir Richard W Scott Catholic Elementary School Markham · Elementary · Grades JK-8	Catholic	220	85.9 Top 5%	93.3% EQAO Grade 6	220
88	Our Lady of Grace Catholic Elementary School Aurora · Elementary · Grades JK-8	Catholic	220	60.9 Top 50%	74% EQAO Grade 6	220
89	St Raphael the Archangel Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	215	51.0 Top 50%	70% EQAO Grade 6	215
90	St Joseph Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	210	59.0 Top 50%	86.7% EQAO Grade 6	210
91	St John Chrysostom Catholic Elementary School Newmarket · Elementary · Grades JK-8	Catholic	210	48.0 Lower 50%	61.7% EQAO Grade 6	210
92	St David Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	205	59.2 Top 50%	81.3% EQAO Grade 6	205
93	Our Lady of the Annunciation Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	205	40.3 Lower 50%	68.3% EQAO Grade 6	205
94	St Anthony Catholic Elementary School Thornhill · Elementary · Grades JK-8	Catholic	195	76.5 Top 25%	91.3% EQAO Grade 6	195
95	Father Henri J M Nouwen Catholic Elementary School Richmond Hill · Elementary · Grades JK-8	Catholic	195	72.6 Top 25%	80% EQAO Grade 6	195
96	Our Lady of the Lake Catholic Elementary School Keswick · Elementary · Grades 7-8	Catholic	195	37.5 Lower 50%	195 Enrolment	195
97	St Giovanni Battista Scalabrini Catholic Elementary School Thornhill · Elementary · Grades JK-8	Catholic	175	76.0 Top 25%	83.3% EQAO Grade 6	175
98	Divine Mercy Catholic Elementary School Maple · Elementary · Grades JK-8	Catholic	175	64.5 Top 50%	78.7% EQAO Grade 6	175
99	Blessed Chiara Badano Catholic Elementary School Stouffville · Elementary · Grades 1-6	Catholic	155	76.1 Top 25%	85.7% EQAO Grade 6	155
100	St Paul Catholic Elementary School Newmarket · Elementary · Grades JK-8	Catholic	150	53.4 Top 50%	86.7% EQAO Grade 6	150

St Robert Catholic High School in Thornhill leads the 2025 list of largest schools in York CDSB with Enrolment 1,705. Of the 100 schools shown, 100 are catholic.

For the full picture see the wider Ontario largest schools rankings, every school on the York 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 York CDSB?

St Robert Catholic High School in Thornhill, Ontario ranks first among largest schools in York CDSB with Enrolment 1,705 (Enrolment: 1,705).

How are largest schools in York 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.