| School | Roll number | County | Total (latest year) | Latest average class size | Largest class | Classes 30+ |
|---|---|---|---|---|---|---|
| SCOIL IOSAGAIN | 19967D | Donegal | 778 | 24.69 | 30 | 1 |
| S N AN DROIM MOR | 16349I | Donegal | 229 | 22.11 | 31 | 1 |
| ST ORANS N S | 16789N | Donegal | 228 | 25.33 | 32 | 3 |
| S N NAOMH AONGHUS | 19359D | Donegal | 218 | 25.00 | 30 | 1 |
| SCOIL EOGHAN | 20054L | Donegal | 212 | 23.56 | 32 | 2 |
| SCOIL NAOMH FIONAN | 19959E | Donegal | 199 | 24.88 | 32 | 1 |
| SCOIL NAOMH BRID | 19280N | Donegal | 196 | 24.50 | 32 | 3 |
| ST MURAS N S | 15627F | Donegal | 189 | 23.62 | 31 | 1 |
| SCOIL NAOMH COLMCHILLE | 16880W | Donegal | 186 | 26.57 | 30 | 1 |
| S N SEISEADH UI NEILL | 17607J | Donegal | 167 | 20.88 | 30 | 1 |
| SCOIL NAOMH PADRAIG BOYS | 18605K | Donegal | 163 | 22.86 | 28 | 0 |
| ST PATRICKS N S | 16054M | Donegal | 162 | 26.00 | 31 | 3 |
| St Mary's National School | 14910S | Donegal | 155 | 25.00 | 35 | 1 |
| SCOIL TREASA NAOFA | 17721H | Donegal | 137 | 25.00 | 28 | 0 |
| SCOIL CHOLMCILLE | 18791K | Donegal | 133 | 22.17 | 32 | 2 |
| St Francis' National School | 16642G | Donegal | 132 | 24.40 | 28 | 0 |
| CLOCHAR PADRAIG NAOFA | 16821G | Donegal | 124 | 17.71 | 26 | 0 |
| SCOIL NÁISIÚNTA MUIRE GAN SMÁL | 18076J | Donegal | 124 | 20.67 | 33 | 1 |
| SCOIL PHADRAIG | 18520C | Donegal | 121 | 24.20 | 28 | 0 |
| SCOIL MHUIRE | 18517N | Donegal | 118 | 23.60 | 32 | 1 |
| NAOMH BODAIN | 19614Q | Donegal | 108 | 27.00 | 31 | 1 |
| S N na gCluainte | 17180W | Donegal | 96 | 24.00 | 28 | 0 |
| NAOMH BRIDHID | 16836T | Donegal | 92 | 23.00 | 28 | 0 |
| SCOIL CHOLMCHILLE | 14631O | Donegal | 77 | 19.25 | 25 | 0 |
| S N NAOMH EIGHNEACH | 18114O | Donegal | 75 | 18.75 | 24 | 0 |
| S N NAOMH PADRAIG | 01572D | Donegal | 64 | 21.33 | 26 | 0 |
| S N GLEANN COIMHEAD | 17575W | Donegal | 57 | 19.00 | 20 | 0 |
| SCOIL NAOMH MHUIRE | 18446Q | Donegal | 57 | 19.00 | 20 | 0 |
| SCOIL NAOMH TREASA C | 16108J | Donegal | 52 | 17.33 | 20 | 0 |
| GLENEELY N S | 18172F | Donegal | 45 | 15.00 | 16 | 0 |
| SCOIL NAOMH IÓSAF | 01574H | Donegal | 45 | 15.00 | 16 | 0 |
| S N AN IORBALL RIABAIGH | 07626H | Donegal | 40 | 20.00 | 25 | 0 |
| SN Naomh Samhthann | 17040G | Donegal | 40 | 13.33 | 16 | 0 |
| SCOIL CUILM CILLE | 17469A | Donegal | 38 | 19.00 | 21 | 0 |
| SCOIL CHOLMCILLE NAOFA | 17956L | Donegal | 17 | 8.50 | 11 | 0 |
| GLENTOGHER CON N S | 16611S | Donegal | 13 | 6.50 | 7 | 0 |