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1. 1
   Maynooth B N S MaynoothBoys
   595 pupils +13.3% over 10 years
2. 2
   S N Naomh Antaine CorkBoys
   581 pupils −29.5% over 10 years
3. 3
   Scoil Phadraig PortarlingtonBoys
   521 pupils +32.6% over 10 years
4. 4
   St Pius X N S Boys Dublin 6Boys
   511 pupils −3.4% over 10 years
5. 5
   Lucan B N S LucanBoys
   501 pupils −0.8% over 10 years
6. 6
   Scoil Padraig Naofa B BlackrockBoys
   499 pupils −22.9% over 10 years
7. 7
   St Patricks BNS ClaneBoys
   488 pupils −1.2% over 10 years
8. 8
   Scoil Chorbain NaasBoys
   460 pupils +4.1% over 10 years
9. 9
   St Brigids Boys N S Dublin 18Boys
   406 pupils −20.9% over 10 years
10. 10
    Scoil na Croi Naofa Dublin 11Boys
    404 pupils −12.9% over 10 years
11. 11
    Scoil Mhuire gan Smal B CorkBoysDEIS
    403 pupils +13.8% over 10 years
12. 12
    Scoil an Spioraid Naomh (Boys) CorkBoys
    398 pupils −0.3% over 10 years
13. 13
    S N Deaglan WaterfordBoys
    396 pupils −9.2% over 10 years
14. 14
    S N Naomh Lorcan StillorganBoys
    390 pupils −12.2% over 10 years
15. 15
    Our Lady of Good Counsel Boys N S Dún LaoghaireBoys
    389 pupils −10.0% over 10 years
16. 16
    Ballyroan B N S Dublin 16Boys
    375 pupils +5.3% over 10 years
17. 17
    S N Realt na Mara (B) MorningtonBoys
    373 pupils −15.8% over 10 years
18. 18
    St Patricks Boys National School DonabateBoys
    370 pupils −3.4% over 10 years
19. 19
    Scoil Mhuire Boys Dublin 14Boys
    367 pupils −19.9% over 10 years
20. 20
    St Stephens N S WaterfordBoysDEIS
    363 pupils −14.6% over 10 years
21. 21
    St Josephs Boys N S Dublin 6Boys
    363 pupils −24.5% over 10 years
22. 22
    Scoil Naomh Seosamh Dublin 22Boys
    360 pupils −12.8% over 10 years
23. 23
    Mount Sion CBS N S WaterfordBoysDEIS
    360 pupils +22.0% over 10 years
24. 24
    St Canices B N S Dublin 11BoysDEIS
    355 pupils −17.8% over 10 years
25. 25
    S N Naomh Eoin B BallincolligBoys
    352 pupils −10.7% over 10 years
26. 26
    Scoil Lorcain BNS WaterfordBoysDEIS
    345 pupils −5.0% over 10 years
27. 27
    Drimnagh Castle CBS N S Dublin 12BoysDEIS
    342 pupils −21.7% over 10 years
28. 28
    S N Bheinn Naofa B DuleekBoysDEIS
    339 pupils −1.7% over 10 years
29. 29
    S N Padraig Naofa KilkennyBoys
    331 pupils −4.3% over 10 years
30. 30
    Scoil Lorcain B Dublin 20Boys
    321 pupils −18.5% over 10 years
31. 31
    S N Cholmille B SwordsBoys
    320 pupils −22.0% over 10 years
32. 32
    SN Eoin Baisde Boys Senior School Dublin 3Boys
    317 pupils −4.5% over 10 years
33. 33
    Rathangan B N S RathanganBoys
    308 pupils +21.3% over 10 years
34. 34
    St Peter and Paul ClonmelBoysDEIS
    304 pupils −2.9% over 10 years
35. 35
    Scoil an Leinbh Iosa Boys Seniors Dublin 9Boys
    297 pupils +14.7% over 10 years
36. 36
    Eoin Baisde B Sois Dublin 3Boys
    294 pupils −12.5% over 10 years
37. 37
    S N Eoin Bosco Buach Dublin 7Boys
    290 pupils −21.0% over 10 years
38. 38
    St Brigids Boys N S Dublin 5Boys
    287 pupils −23.7% over 10 years
39. 39
    S N Barra Naofa Bhuach CorkBoys
    280 pupils −3.1% over 10 years
40. 40
    Scoil Chriost Ri B LimerickBoysDEIS
    278 pupils −4.1% over 10 years
41. 41
    St Kevins Boys Dublin 24Boys
    275 pupils −16.4% over 10 years
42. 42
    St John the Baptist Boys School CashelBoysDEIS
    268 pupils −3.6% over 10 years
43. 43
    S N B Togher Cork CorkBoysDEIS
    252 pupils −13.1% over 10 years
44. 44
    S N N Maolmhaodhagh B DundalkBoys
    246 pupils +22.4% over 10 years
45. 45
    Scoil Naisiunta Naomh Pheadar MonasterevinBoys
    239 pupils +2.6% over 10 years
46. 46
    St Joseph's National School CarrickmacrossBoys
    234 pupils −18.8% over 10 years
47. 47
    Holy Spirit B N S Dublin 11BoysDEIS
    229 pupils −33.8% over 10 years
48. 48
    Scoil Naomh Micheal LongfordBoysDEIS
    224 pupils +28.7% over 10 years
49. 49
    Star of the Sea Dublin 4Boys
    223 pupils −37.7% over 10 years
50. 50
    Scoil Iosagain LimerickBoysDEIS
    222 pupils +1.4% over 10 years
51. 51
    Scoil Iosagain CorkBoysDEIS
    222 pupils −39.8% over 10 years
52. 52
    St Brendans N S LoughreaBoys
    216 pupils +10.8% over 10 years
53. 53
    SN Cros Tseain CorkBoys
    215 pupils +1.9% over 10 years
54. 54
    S N Iosef Naofa CorkBoys
    215 pupils +1.4% over 10 years
55. 55
    Arden Boys NS TullamoreBoysDEIS
    215 pupils +53.6% over 10 years
56. 56
    S N Naomh Padraig Boys Senior School MallowBoys
    212 pupils +1.0% over 10 years
57. 57
    S N Muire an Port Mor WaterfordBoys
    212 pupils −1.4% over 10 years
58. 58
    Scoil na mBraithre TipperaryBoysDEIS
    199 pupils +7.0% over 10 years
59. 59
    Scoil Padraig Naofa B LimerickBoysDEIS
    197 pupils −10.0% over 10 years
60. 60
    Scoil Bride B Dublin 15Boys
    193 pupils −43.2% over 10 years
61. 61
    Midleton CBS Primary School MidletonBoys
    191 pupils −38.2% over 10 years
62. 62
    Booterstown Boys BlackrockBoys
    188 pupils −35.4% over 10 years
63. 63
    Mountmellick Boys N S MountmellickBoysDEIS
    187 pupils −31.2% over 10 years
64. 64
    S N Phroinsiais Naofa ClaraBoysDEIS
    186 pupils −19.8% over 10 years
65. 65
    Scoil Mhuire BNS CastleblayneyBoysDEIS
    183 pupils +16.6% over 10 years
66. 66
    Cromcastle Green B N S Dublin 5BoysDEIS
    183 pupils −11.2% over 10 years
67. 67
    St Brendans Monastery BirrBoysDEIS
    178 pupils −18.7% over 10 years
68. 68
    Scoil an Maighdine Mhuire Boys Dublin 16Boys
    176 pupils −29.3% over 10 years
69. 69
    Bantiarna na mBuanna Boys Dublin 9BoysDEIS
    174 pupils −10.3% over 10 years
70. 70
    Scoil na mBraithre MitchelstownBoysDEIS
    172 pupils −16.1% over 10 years
71. 71
    Rathdrum Boys N S RathdrumBoysDEIS
    172 pupils +25.5% over 10 years
72. 72
    S N Banrion na nAingeal 1 Dublin 10BoysDEIS
    171 pupils +20.4% over 10 years
73. 73
    S N an Tslanaitheora B DundalkBoysDEIS
    169 pupils +101.2% over 10 years
74. 74
    Scoil Mhuire na Mainistreach KillarneyBoys
    167 pupils 0.0% over 10 years
75. 75
    Realt na Maidne ListowelBoysDEIS
    166 pupils −5.1% over 10 years
76. 76
    Bishop Foley Memorial School Boys SNR SCH Station RoadBoysDEIS
    165 pupils −37.3% over 10 years
77. 77
    St Nicholas Monastery NS DundalkBoysDEIS
    164 pupils −3.0% over 10 years
78. 78
    Scoil Ui Chonaill Boys Seniors Dublin 1BoysDEIS
    155 pupils +6.2% over 10 years
79. 79
    St Patricks B N S CorkBoysDEIS
    152 pupils −27.3% over 10 years
80. 80
    Scoil Naomh Seosamh DungarvanBoysDEIS
    151 pupils +24.8% over 10 years
81. 81
    Scoil Chiarain Dublin 5BoysDEIS
    151 pupils +14.4% over 10 years
82. 82
    S N na Maighdine Muire B Dublin 9BoysDEIS
    151 pupils +12.7% over 10 years
83. 83
    S N Phadraig Naofa TullowBoysDEIS
    150 pupils −34.2% over 10 years
84. 84
    S N Eoin Bosco Nai Buac Dublin 7Boys
    146 pupils −40.9% over 10 years
85. 85
    Scoil Naomh Iosaf AdareBoys
    140 pupils −1.4% over 10 years
86. 86
    Scoil Bhreandain Dublin 5BoysDEIS
    136 pupils −9.9% over 10 years
87. 87
    S N na mBuachailli NewportBoys
    135 pupils −2.2% over 10 years
88. 88
    Bainrion na nAingal 2 Dublin 10BoysDEIS
    133 pupils +20.9% over 10 years
89. 89
    St Kevins B N S Dublin 11BoysDEIS
    131 pupils −22.5% over 10 years
90. 90
    St Malachys B N S Dublin 5BoysDEIS
    130 pupils −36.0% over 10 years
91. 91
    Fionnbarra Naofa B.N.S. Dublin 7BoysDEIS
    126 pupils −5.3% over 10 years
92. 92
    S N Mhuire na mBraithre Carrick-on-SuirBoysDEIS
    122 pupils −22.3% over 10 years
93. 93
    Lady of Good Counsel Boys Senior NS Dublin 12BoysDEIS
    120 pupils −17.8% over 10 years
94. 94
    St Joseph¿s Primary School, An Edmund Rice School Dublin 3BoysDEIS
    116 pupils −11.5% over 10 years
95. 95
    S N Naomh Brighde Buach TullamoreBoysDEIS
    116 pupils −24.7% over 10 years
96. 96
    Bishop Murphy Memorial Boys Senior National School FermoyBoys
    112 pupils +14.3% over 10 years
97. 97
    St Colmcilles Primary School TemplemoreBoysDEIS
    109 pupils +23.9% over 10 years
98. 98
    St Fintans N S MountrathBoysDEIS
    108 pupils +36.7% over 10 years
99. 99
    Tipperary JNR BN S TipperaryBoysDEIS
    107 pupils −10.8% over 10 years
100. 100
     Realt na Maidine CorkBoysDEIS
     107 pupils −12.3% over 10 years

Distances are straight lines, not travel routes. Pupil numbers and class sizes: Department of Education, 2025/26. Change is over 10 years, since 2015/16. Average class size counts mainstream classes only, and there's one class teacher for each mainstream class. Totals cover every school in the results, not just those shown.