Largest Schools in Algonquin and Lakeshore CDSB (2025)
Schools with the highest enrolment. Ranked by the Success Index (Canada) from official Canadian data; 36 schools in Algonquin and Lakeshore CDSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.
- 162Holy Cross Catholic Secondary SchoolKingston · Catholic SecondaryEnrolment: 1,295
- 248Regiopolis/Notre-Dame Catholic High SchoolKingston · Catholic SecondaryEnrolment: 825
- 347St Theresa Catholic Secondary SchoolBelleville · Catholic SecondaryEnrolment: 775
- 428St Michael Catholic SchoolBelleville · Catholic ElementaryEnrolment: 560
- 574St. Genevieve Catholic School/Ecole Catholique Sainte-GenevieveKingston · Catholic ElementaryEnrolment: 500
- 653Nicholson Catholic CollegeBelleville · Catholic SecondaryEnrolment: 490
- 743St Paul Catholic Secondary SchoolTrenton · Catholic SecondaryEnrolment: 475
- 843St Marguerite Bourgeoys Catholic SchoolKingston · Catholic ElementaryEnrolment: 435
- 927St Peter Catholic SchoolTrenton · Catholic ElementaryEnrolment: 420
- 1040Our Lady of Mount Carmel Catholic SchoolAmherstview · Catholic ElementaryEnrolment: 405
- 1158St Joseph Catholic SchoolBelleville · Catholic ElementaryEnrolment: 385
- 1242St Mary Catholic SchoolTrenton · Catholic ElementaryEnrolment: 360
- 1354St Martha Catholic SchoolKingston · Catholic ElementaryEnrolment: 330
- 1432Georges Vanier Catholic SchoolBelleville · Catholic ElementaryEnrolment: 310
- 1559Cathedrale Catholic SchoolKingston · Catholic ElementaryEnrolment: 300
- 169St Francis of Assisi Catholic SchoolKingston · Catholic ElementaryEnrolment: 290
- 1756St. John XXIII Catholic SchoolKingston · Catholic ElementaryEnrolment: 285
- 1821St Thomas More Catholic SchoolKingston · Catholic ElementaryEnrolment: 285
- 1934Our Lady of Mercy Catholic SchoolBancroft · Catholic ElementaryEnrolment: 255
- 2042Holy Rosary Catholic SchoolBelleville · Catholic ElementaryEnrolment: 250
- 2139J J O'Neill Catholic SchoolNapanee · Catholic ElementaryEnrolment: 250
- 2256St Patrick Catholic SchoolHarrowsmith · Catholic ElementaryEnrolment: 245
- 2380Archbishop O'Sullivan Catholic SchoolKingston · Catholic ElementaryEnrolment: 230
- 2476St. Teresa of Calcutta Catholic SchoolKingston · Catholic ElementaryEnrolment: 220
- 2526St Gregory Catholic SchoolPicton · Catholic ElementaryEnrolment: 215
- 2635Our Lady of Lourdes Catholic SchoolKingston · Catholic ElementaryEnrolment: 210
- 2738St Paul Catholic Elementary SchoolTrenton · Catholic ElementaryEnrolment: 205
- 2858St Paul Catholic SchoolKingston · Catholic ElementaryEnrolment: 175
- 2914Our Lady of Fatima Catholic SchoolBelleville · Catholic ElementaryEnrolment: 175
- 3046Sacred Heart Catholic SchoolBatawa · Catholic ElementaryEnrolment: 160
- 3167St Mary Catholic SchoolShannonville · Catholic ElementaryEnrolment: 140
- 3251Sacred Heart Catholic SchoolMarmora · Catholic ElementaryEnrolment: 140
- 3331Holy Name of Mary Catholic SchoolMarysville · Catholic ElementaryEnrolment: 140
- 3487Holy Name Catholic SchoolKingston · Catholic ElementaryEnrolment: 135
- 3559Nicholson Catholic College (Grade 7 & 8)Belleville · Catholic ElementaryEnrolment: 135
- 3659St Carthagh Catholic SchoolTweed · Catholic ElementaryEnrolment: 120
| # | School | Sector | Enrolment | Success Index (Canada) | Key result | Students |
|---|---|---|---|---|---|---|
| 1 | Holy Cross Catholic Secondary School Kingston · Secondary · Grades 9-12 | Catholic | 1,295 | 62.1 Top 50% | 89% OSSLT pass rate | 1,295 |
| 2 | Regiopolis/Notre-Dame Catholic High School Kingston · Secondary · Grades 9-12 | Catholic | 825 | 48.2 Lower 50% | 83% OSSLT pass rate | 825 |
| 3 | St Theresa Catholic Secondary School Belleville · Secondary · Grades 9-12 | Catholic | 775 | 46.7 Lower 50% | 84% OSSLT pass rate | 775 |
| 4 | St Michael Catholic School Belleville · Elementary · Grades JK-8 | Catholic | 560 | 27.6 Lower 50% | 61.7% EQAO Grade 6 | 560 |
| 5 | St. Genevieve Catholic School/Ecole Catholique Sainte-Genevieve Kingston · Elementary · Grades JK-8 | Catholic | 500 | 74.1 Top 25% | 82.3% EQAO Grade 6 | 500 |
| 6 | Nicholson Catholic College Belleville · Secondary · Grades 9-12 | Catholic | 490 | 52.8 Top 50% | 87% OSSLT pass rate | 490 |
| 7 | St Paul Catholic Secondary School Trenton · Secondary · Grades 9-12 | Catholic | 475 | 43.3 Lower 50% | 86% OSSLT pass rate | 475 |
| 8 | St Marguerite Bourgeoys Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 435 | 43.4 Lower 50% | 65.7% EQAO Grade 6 | 435 |
| 9 | St Peter Catholic School Trenton · Elementary · Grades JK-8 | Catholic | 420 | 26.8 Lower 50% | 61.7% EQAO Grade 6 | 420 |
| 10 | Our Lady of Mount Carmel Catholic School Amherstview · Elementary · Grades JK-8 | Catholic | 405 | 39.8 Lower 50% | 65% EQAO Grade 6 | 405 |
| 11 | St Joseph Catholic School Belleville · Elementary · Grades JK-8 | Catholic | 385 | 57.7 Top 50% | 85.7% EQAO Grade 6 | 385 |
| 12 | St Mary Catholic School Trenton · Elementary · Grades JK-6 | Catholic | 360 | 42.3 Lower 50% | 73.7% EQAO Grade 6 | 360 |
| 13 | St Martha Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 330 | 54.2 Top 50% | 71.7% EQAO Grade 6 | 330 |
| 14 | Georges Vanier Catholic School Belleville · Elementary · Grades JK-8 | Catholic | 310 | 32.3 Lower 50% | 66% EQAO Grade 6 | 310 |
| 15 | Cathedrale Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 300 | 59.0 Top 50% | 79.3% EQAO Grade 6 | 300 |
| 16 | St Francis of Assisi Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 290 | 8.9 Lower 50% | 60.3% EQAO Grade 6 | 290 |
| 17 | St. John XXIII Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 285 | 55.5 Top 50% | 80% EQAO Grade 6 | 285 |
| 18 | St Thomas More Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 285 | 21.1 Lower 50% | 45.7% EQAO Grade 6 | 285 |
| 19 | Our Lady of Mercy Catholic School Bancroft · Elementary · Grades JK-8 | Catholic | 255 | 33.9 Lower 50% | 59% EQAO Grade 6 | 255 |
| 20 | Holy Rosary Catholic School Belleville · Elementary · Grades JK-8 | Catholic | 250 | 42.2 Lower 50% | 73.3% EQAO Grade 6 | 250 |
| 21 | J J O'Neill Catholic School Napanee · Elementary · Grades JK-8 | Catholic | 250 | 39.4 Lower 50% | 64% EQAO Grade 6 | 250 |
| 22 | St Patrick Catholic School Harrowsmith · Elementary · Grades JK-8 | Catholic | 245 | 55.7 Top 50% | 75% EQAO Grade 6 | 245 |
| 23 | Archbishop O'Sullivan Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 230 | 80.0 Top 10% | 90% EQAO Grade 6 | 230 |
| 24 | St. Teresa of Calcutta Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 220 | 76.3 Top 25% | 83.3% EQAO Grade 6 | 220 |
| 25 | St Gregory Catholic School Picton · Elementary · Grades JK-8 | Catholic | 215 | 25.8 Lower 50% | 35% EQAO Grade 6 | 215 |
| 26 | Our Lady of Lourdes Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 210 | 34.8 Lower 50% | 65% EQAO Grade 6 | 210 |
| 27 | St Paul Catholic Elementary School Trenton · Elementary · Grades 7-8 | Catholic | 205 | 37.5 Lower 50% | 205 Enrolment | 205 |
| 28 | St Paul Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 175 | 58.2 Top 50% | 82% EQAO Grade 6 | 175 |
| 29 | Our Lady of Fatima Catholic School Belleville · Elementary · Grades JK-8 | Catholic | 175 | 14.0 Lower 50% | 59% EQAO Grade 6 | 175 |
| 30 | Sacred Heart Catholic School Batawa · Elementary · Grades JK-8 | Catholic | 160 | 46.2 Lower 50% | 72.7% EQAO Grade 6 | 160 |
| 31 | St Mary Catholic School Shannonville · Elementary · Grades JK-8 | Catholic | 140 | 67.2 Top 25% | 71.7% EQAO Grade 3 | 140 |
| 32 | Sacred Heart Catholic School Marmora · Elementary · Grades JK-8 | Catholic | 140 | 50.8 Lower 50% | 74% EQAO Grade 3 | 140 |
| 33 | Holy Name of Mary Catholic School Marysville · Elementary · Grades JK-8 | Catholic | 140 | 30.9 Lower 50% | 69% EQAO Grade 6 | 140 |
| 34 | Holy Name Catholic School Kingston · Elementary · Grades JK-8 | Catholic | 135 | 86.7 Top 5% | 135 Enrolment | 135 |
| 35 | Nicholson Catholic College (Grade 7 & 8) Belleville · Elementary · Grades 7-8 | Catholic | 135 | 59.2 Top 50% | 135 Enrolment | 135 |
| 36 | St Carthagh Catholic School Tweed · Elementary · Grades JK-8 | Catholic | 120 | 59.4 Top 50% | 85% EQAO Grade 6 | 120 |
Holy Cross Catholic Secondary School in Kingston leads the 2025 list of largest schools in Algonquin and Lakeshore CDSB with Enrolment 1,295. Of the 36 schools shown, 36 are catholic.
For the full picture see the wider Ontario largest schools rankings, every school on the Algonquin and Lakeshore 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 Algonquin and Lakeshore CDSB?
Holy Cross Catholic Secondary School in Kingston, Ontario ranks first among largest schools in Algonquin and Lakeshore CDSB with Enrolment 1,295 (Enrolment: 1,295).
How are largest schools in Algonquin and Lakeshore 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.