| School | Roll number | County | Total (latest year) | Latest average class size | Largest class | Classes 30+ |
|---|---|---|---|---|---|---|
| SCOIL CHOILMCILLE | 18625Q | Donegal | 658 | 26.96 | 28 | 0 |
| SCOIL NAOMH FIACHRA | 12077E | Donegal | 519 | 25.95 | 32 | 6 |
| S N MUIRE GAN SMAL | 18052S | Donegal | 480 | 24.95 | 30 | 10 |
| S N Talamh na Coille | 17728V | Donegal | 467 | 22.58 | 28 | 0 |
| ST PATRICKS N S | 16672P | Donegal | 426 | 24.35 | 31 | 3 |
| Letterkenny Educate Together NS | 20235P | Donegal | 420 | 23.65 | 31 | 2 |
| GAELSCOIL ADHAMHNAIN | 19971R | Donegal | 410 | 25.62 | 30 | 2 |
| GLENSWILLY N S | 19313C | Donegal | 262 | 23.27 | 32 | 3 |
| S N NAOMH COLMCHILLE | 17036P | Donegal | 231 | 24.33 | 30 | 1 |
| S N BAILE RAIGHIN | 19411C | Donegal | 215 | 23.22 | 29 | 0 |
| Scoil Cholmcille | 16820E | Donegal | 199 | 24.88 | 32 | 1 |
| SCOIL CHOLMCILLE | 14194S | Donegal | 127 | 19.17 | 26 | 0 |
| SCOIL NAOMH PROINNSEAS | 17729A | Donegal | 119 | 23.80 | 26 | 0 |
| MOYLE N S | 19633U | Donegal | 81 | 20.25 | 26 | 0 |
| S N NAOMH COLMCHILLE | 16995Q | Donegal | 81 | 20.25 | 26 | 0 |
| Scoil an tStratha Mhóir | 15208I | Donegal | 64 | 21.33 | 28 | 0 |
| RAY N S | 14941G | Donegal | 51 | 17.00 | 19 | 0 |
| S N TRIANTA | 18319J | Donegal | 33 | 16.50 | 22 | 0 |
| CASHELSHANAGHAN N S | 15170J | Donegal | 28 | 14.00 | 14 | 0 |
| SCOIL NAOMH SEOSAMH | 18058H | Donegal | 24 | 12.00 | 14 | 0 |
| GARTAN N S | 13755E | Donegal | 19 | 9.50 | 11 | 0 |