| School | Roll number | County | Total (latest year) | Latest average class size | Largest class | Classes 30+ |
|---|---|---|---|---|---|---|
| THE HAROLD SCHOOL | 20141G | Dublin | 642 | 23.56 | 28 | 0 |
| SCOIL PADRAIG NAOFA B | 19258U | Dublin | 499 | 23.48 | 30 | 1 |
| SCOIL LORCÁIN | 18451J | Dublin | 485 | 25.53 | 31 | 9 |
| ST PATRICKS GNS | 19259W | Dublin | 478 | 23.90 | 35 | 2 |
| SCOIL CAOIMHIN NAOFA | 17954H | Dublin | 428 | 25.18 | 30 | 1 |
| Scoil na nAingeal | 19335M | Dublin | 410 | 24.12 | 28 | 0 |
| ST JOSEPHS | 19938T | Dublin | 370 | 21.35 | 27 | 0 |
| LORETO NATIONAL SCHOOL | 19066L | Dublin | 314 | 25.17 | 29 | 0 |
| CLOCHAR SAN DOMINIC | 05600C | Dublin | 184 | 17.20 | 21 | 0 |
| Dun Laoghaire ETNS | 20503O | Dublin | 177 | 22.12 | 32 | 1 |
| HOLY FAMILY SCHOOL | 19840C | Dublin | 149 | 17.12 | 22 | 0 |
| HAROLD BOYS N S | 15132B | Dublin | 106 | 21.20 | 25 | 0 |
| DALKEY N S (2) | 14647G | Dublin | 101 | 25.25 | 27 | 0 |
| ALL SAINTS N S | 10494K | Dublin | 51 | 17.00 | 20 | 0 |