| School | Roll number | County | Total (latest year) | Latest average class size | Largest class | Classes 30+ |
|---|---|---|---|---|---|---|
| FOXFORD CENTRAL NS | 19812U | Mayo | 271 | 24.64 | 33 | 2 |
| S N ATHRACHT NFA | 18003F | Mayo | 268 | 29.50 | 32 | 5 |
| KILTIMAGH CENTRAL | 19903A | Mayo | 262 | 26.20 | 34 | 4 |
| SWINFORD NS | 19951L | Mayo | 200 | 24.25 | 28 | 0 |
| SN MUINE CHONALLAIN | 13667H | Mayo | 133 | 26.60 | 34 | 2 |
| Scoil na gCoillini | 02912G | Mayo | 97 | 24.25 | 30 | 1 |
| CARRACASTLE CENTRAL NS | 19651W | Mayo | 88 | 22.00 | 27 | 0 |
| SCOIL NAISIUNTA THOLA | 19914F | Mayo | 84 | 21.00 | 27 | 0 |
| SN AN TRIAN LAIR | 13389F | Mayo | 66 | 22.00 | 26 | 0 |
| SN NMH TREASA | 18145C | Mayo | 57 | 19.00 | 25 | 0 |
| KILMOVEE IN S | 13080V | Mayo | 51 | 17.00 | 22 | 0 |
| KINAFFE N S | 16173U | Mayo | 48 | 16.00 | 19 | 0 |
| S N PEADAR AGUS POL | 18848N | Mayo | 45 | 15.00 | 22 | 0 |
| ST COLMANS NS | 19798G | Mayo | 34 | 17.00 | 19 | 0 |
| CULMORE N S | 16780S | Mayo | 33 | 16.50 | 17 | 0 |
| KILLASSER NS | 16269K | Mayo | 31 | 15.50 | 17 | 0 |
| CLOONLYON N S | 12936D | Mayo | 28 | 14.00 | 16 | 0 |
| ST JOHNS N S | 16289Q | Mayo | 27 | 13.50 | 15 | 0 |
| SCOIL NAOMH FEICHIN | 19488O | Mayo | 26 | 13.00 | 17 | 0 |
| CRAGGAGH N S | 12467R | Mayo | 19 | 9.50 | 10 | 0 |
| S N SHEAMAIS | 15113U | Mayo | 18 | 9.00 | 9 | 0 |
| S N TAMHNIGHAN FHEADHA | 12938H | Mayo | 15 | 7.50 | 9 | 0 |
| TAVRANE CENTRAL NS | 19808G | Mayo | 11 | 5.50 | 8 | 0 |