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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

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.