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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

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.