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Largest Schools in Upper Canada DSB (2025)

Schools with the highest enrolment. Ranked by the Success Index (Canada) from official Canadian data; 94 schools in Upper Canada DSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.

  1. 1
    21
    Smiths Falls District Collegiate InstituteSmiths Falls · Public SecondaryEnrolment: 700
  2. 2
    59
    Carleton Place High SchoolCarleton Place · Public SecondaryEnrolment: 670
  3. 3
    44
    Thousand Islands Secondary SchoolBrockville · Public SecondaryEnrolment: 640
  4. 4
    73
    North Grenville District High SchoolKemptville · Public SecondaryEnrolment: 605
  5. 5
    67
    Beckwith Public SchoolCarleton Place · Public ElementaryEnrolment: 580
  6. 6
    31
    Perth and District Collegiate InstitutePerth · Public SecondaryEnrolment: 580
  7. 7
    8
    Cornwall Collegiate and Vocational SchoolCornwall · Public SecondaryEnrolment: 575
  8. 8
    4
    Central Public SchoolCornwall · Public ElementaryEnrolment: 575
  9. 9
    27
    Rockland Public SchoolRockland · Public ElementaryEnrolment: 545
  10. 10
    60
    Kemptville Public SchoolKemptville · Public ElementaryEnrolment: 540
  11. 11
    35
    Cambridge Public SchoolEmbrun · Public ElementaryEnrolment: 535
  12. 12
    54
    Pleasant Corners Public SchoolVankleek Hill · Public ElementaryEnrolment: 520
  13. 13
    12
    Bridgewood Public SchoolCornwall · Public ElementaryEnrolment: 520
  14. 14
    5
    St Lawrence Secondary SchoolCornwall · Public SecondaryEnrolment: 505
  15. 15
    24
    Eamer's Corners Public SchoolCornwall · Public ElementaryEnrolment: 500
  16. 16
    37
    Tagwi Secondary SchoolAvonmore · Public SecondaryEnrolment: 495
  17. 17
    71
    South Branch Elementary SchoolKemptville · Public ElementaryEnrolment: 425
  18. 18
    59
    Brockville Collegiate InstituteBrockville · Public SecondaryEnrolment: 425
  19. 19
    32
    Swift Waters Elementary SchoolBrockville · Public ElementaryEnrolment: 415
  20. 20
    25
    Viscount Alexander Public SchoolCornwall · Public ElementaryEnrolment: 410
  21. 21
    50
    Arklan Community Public SchoolCarleton Place · Public ElementaryEnrolment: 400
  22. 22
    49
    Chimo Elementary SchoolSmiths Falls · Public ElementaryEnrolment: 395
  23. 23
    71
    Caldwell Street Elementary SchoolCarleton Place · Public ElementaryEnrolment: 385
  24. 24
    50
    Avonmore Elementary SchoolAvonmore · Public ElementaryEnrolment: 385
  25. 25
    67
    Almonte District High SchoolAlmonte · Public SecondaryEnrolment: 380
  26. 26
    62
    Russell Public Public SchoolRussell · Public ElementaryEnrolment: 380
  27. 27
    61
    North Dundas District High SchoolChesterville · Public SecondaryEnrolment: 380
  28. 28
    10
    Duncan J Schoular Public SchoolSmiths Falls · Public ElementaryEnrolment: 380
  29. 29
    42
    Westminster Public SchoolBrockville · Public ElementaryEnrolment: 370
  30. 30
    35
    South Grenville District High SchoolPrescott · Public SecondaryEnrolment: 370
  31. 31
    29
    Vankleek Hill Collegiate InstituteVankleek Hill · Public SecondaryEnrolment: 370
  32. 32
    55
    Russell High SchoolRussell · Public SecondaryEnrolment: 360
  33. 33
    33
    The Stewart Public SchoolPerth · Public ElementaryEnrolment: 355
  34. 34
    62
    Williamstown Public SchoolWilliamstown · Public ElementaryEnrolment: 350
  35. 35
    60
    Rockland District High SchoolRockland · Public SecondaryEnrolment: 340
  36. 36
    87
    North Grenville Intermediate SchoolKemptville · Public ElementaryEnrolment: 335
  37. 37
    68
    Gananoque Secondary SchoolGananoque · Public SecondaryEnrolment: 335
  38. 38
    54
    Naismith Memorial Public SchoolAlmonte · Public ElementaryEnrolment: 335
  39. 39
    35
    South Crosby Public SchoolElgin · Public ElementaryEnrolment: 325
  40. 40
    76
    R Tait McKenzie Public SchoolAlmonte · Public ElementaryEnrolment: 305
  41. 41
    72
    Thousand Islands Elementary SchoolLansdowne · Public ElementaryEnrolment: 305
  42. 42
    87
    Carleton Place Intermediate SchoolCarleton Place · Public ElementaryEnrolment: 295
  43. 43
    65
    Rideau District High SchoolElgin · Public SecondaryEnrolment: 295
  44. 44
    73
    The Queen Elizabeth SchoolPerth · Public ElementaryEnrolment: 290
  45. 45
    61
    Lombardy Public SchoolLombardy · Public ElementaryEnrolment: 290
  46. 46
    63
    Montague Public SchoolSmiths Falls · Public ElementaryEnrolment: 285
  47. 47
    63
    Iroquois Public SchoolIroquois · Public ElementaryEnrolment: 285
  48. 48
    60
    Winchester Public SchoolWinchester · Public ElementaryEnrolment: 285
  49. 49
    45
    Nationview Public SchoolSouth Mountain · Public ElementaryEnrolment: 285
  50. 50
    37
    Seaway District High SchoolIroquois · Public SecondaryEnrolment: 265
  51. 51
    49
    Maynard Public SchoolPrescott · Public ElementaryEnrolment: 260
  52. 52
    42
    Vanier Public SchoolBrockville · Public ElementaryEnrolment: 250
  53. 53
    59
    Perth Intermediate SchoolPerth · Public ElementaryEnrolment: 245
  54. 54
    51
    Glengarry District High SchoolAlexandria · Public SecondaryEnrolment: 235
  55. 55
    49
    Longue Sault Public SchoolLong Sault · Public ElementaryEnrolment: 235
  56. 56
    38
    Laggan Public SchoolDalkeith · Public ElementaryEnrolment: 225
  57. 57
    55
    Thousand Islands Intermediate SchoolBrockville · Public ElementaryEnrolment: 220
  58. 58
    39
    Chesterville Public SchoolChesterville · Public ElementaryEnrolment: 220
  59. 59
    49
    Pineview Public SchoolAthens · Public ElementaryEnrolment: 210
  60. 60
    64
    Wellington Elementary Public SchoolPrescott · Public ElementaryEnrolment: 205
  61. 61
    9
    St Lawrence Intermediate SchoolCornwall · Public ElementaryEnrolment: 205
  62. 62
    88
    Lyn Public SchoolLyn · Public ElementaryEnrolment: 200
  63. 63
    87
    Russell Intermediate SchoolRussell · Public ElementaryEnrolment: 200
  64. 64
    76
    Almonte Intermediate SchoolAlmonte · Public ElementaryEnrolment: 200
  65. 65
    67
    Charlottenburgh and Lancaster District High SchoolWilliamstown · Public SecondaryEnrolment: 200
  66. 66
    65
    North Dundas Intermediate SchoolChesterville · Public ElementaryEnrolment: 195
  67. 67
    59
    South Grenville Intermediate SchoolPrescott · Public ElementaryEnrolment: 190
  68. 68
    55
    Tagwi Intermediate SchoolAvonmore · Public ElementaryEnrolment: 185
  69. 69
    22
    Cornwall Intermediate SchoolCornwall · Public ElementaryEnrolment: 165
  70. 70
    76
    Rockland Intermediate SchoolRockland · Public ElementaryEnrolment: 160
  71. 71
    51
    Linklater Public SchoolGananoque · Public ElementaryEnrolment: 160
  72. 72
    27
    Athens District High SchoolAthens · Public SecondaryEnrolment: 160
  73. 73
    20
    Maple Grove Public SchoolLanark · Public ElementaryEnrolment: 160
  74. 74
    81
    Centennial 67 Public SchoolSpencerville · Public ElementaryEnrolment: 150
  75. 75
    59
    BCI Intermediate SchoolBrockville · Public ElementaryEnrolment: 150
  76. 76
    50
    South Edwardsburg Public SchoolJohnstown · Public ElementaryEnrolment: 150
  77. 77
    44
    Meadowview Public SchoolAddison · Public ElementaryEnrolment: 150
  78. 78
    36
    Morrisburg Public SchoolMorrisburg · Public ElementaryEnrolment: 150
  79. 79
    83
    Pakenham Public SchoolPakenham · Public ElementaryEnrolment: 140
  80. 80
    76
    Rideau Intermediate SchoolElgin · Public ElementaryEnrolment: 140
  81. 81
    76
    Merrickville Public SchoolMerrickville · Public ElementaryEnrolment: 140
  82. 82
    59
    Gananoque Intermediate SchoolGananoque · Public ElementaryEnrolment: 130
  83. 83
    64
    Front of Yonge Elementary SchoolMallorytown · Public ElementaryEnrolment: 120
  84. 84
    55
    Rothwell-Osnabruck Elementary SchoolIngleside · Public ElementaryEnrolment: 115
  85. 85
    59
    Seaway Intermediate SchoolIroquois · Public ElementaryEnrolment: 110
  86. 86
    63
    Glen Tay Public SchoolPerth · Public ElementaryEnrolment: 105
  87. 87
    63
    Drummond Central SchoolPerth · Public ElementaryEnrolment: 100
  88. 88
    59
    Char-Lan Intermediate SchoolWilliamstown · Public ElementaryEnrolment: 100
  89. 89
    34
    Oxford on Rideau Public SchoolOxford Mills · Public ElementaryEnrolment: 100
  90. 90
    87
    Rideau Vista Public SchoolWestport · Public ElementaryEnrolment: 95
  91. 91
    59
    Glengarry Intermediate SchoolAlexandria · Public ElementaryEnrolment: 90
  92. 92
    43
    Sweet's Corners Public SchoolLyndhurst · Public ElementaryEnrolment: 90
  93. 93
    78
    Maxville Public SchoolMaxville · Public ElementaryEnrolment: 75
  94. 94
    33
    North Elmsley Public SchoolPerth · Public ElementaryEnrolment: 70

Smiths Falls District Collegiate Institute in Smiths Falls leads the 2025 list of largest schools in Upper Canada DSB with Enrolment 700. Of the 94 schools shown, 94 are public.

For the full picture see the wider Ontario largest schools rankings, every school on the Upper Canada DSB 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 Upper Canada DSB?

Smiths Falls District Collegiate Institute in Smiths Falls, Ontario ranks first among largest schools in Upper Canada DSB with Enrolment 700 (Enrolment: 700).

How are largest schools in Upper Canada DSB 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.