| School | Roll number | County | Total (latest year) | Latest average class size | Largest class | Classes 30+ |
|---|---|---|---|---|---|---|
| QUIGNAMANGER N S | 15257V | Mayo | 364 | 24.27 | 34 | 3 |
| CULLENS N S | 07054L | Mayo | 273 | 23.82 | 29 | 0 |
| Scoil Íosa | 20275E | Mayo | 242 | 17.62 | 22 | 0 |
| SCOIL CHOLMCILLE | 15555G | Mayo | 231 | 25.11 | 31 | 3 |
| BEHEYMORE N S | 11725I | Mayo | 228 | 27.75 | 29 | 0 |
| St Joseph's NS | 18561Q | Mayo | 217 | 22.11 | 31 | 1 |
| S N NAOMH PADRAIG | 12206M | Mayo | 148 | 24.67 | 32 | 1 |
| Gaelscoil na gCeithre Maol | 20084U | Mayo | 141 | 20.14 | 26 | 0 |
| SN MUINE CHONALLAIN | 13667H | Mayo | 133 | 26.60 | 34 | 2 |
| Ardagh National School | 20576S | Mayo | 73 | 18.25 | 23 | 0 |
| Newtownwhite Educate Together NS | 09040K | Mayo | 59 | 19.67 | 22 | 0 |
| COONEAL N.S. | 17209U | Mayo | 58 | 19.33 | 22 | 0 |
| Bunscoil Naomh Bríd agus Pádraíg | 20552E | Mayo | 46 | 15.33 | 21 | 0 |
| KNOCKANILLO N S | 16562I | Mayo | 28 | 14.00 | 17 | 0 |
| SCOIL NAOMH FEICHIN | 19488O | Mayo | 26 | 13.00 | 17 | 0 |
| GARRACLOON N S | 06852L | Mayo | 25 | 12.50 | 14 | 0 |
| SAINT MICHAELS N S | 12792F | Mayo | 17 | 8.50 | 9 | 0 |
| CLOGHANS N S | 16170O | Mayo | 9 | 4.50 | 5 | 0 |