| School | Roll number | County | Total (latest year) | Latest average class size | Largest class | Classes 30+ |
|---|---|---|---|---|---|---|
| OUR LADY OF MERCY N S | 19985F | Sligo | 449 | 17.96 | 22 | 0 |
| S N URSULA | 18979F | Sligo | 439 | 24.06 | 29 | 0 |
| CARRAROE N S | 14636B | Sligo | 389 | 24.31 | 28 | 0 |
| SCOIL EOIN NAOFA | 19974A | Sligo | 289 | 17.80 | 25 | 0 |
| S N MOLAOISE | 18575E | Sligo | 274 | 24.45 | 32 | 2 |
| SCOIL ASICUS | 15004P | Sligo | 252 | 25.20 | 30 | 2 |
| RANSBORO NEW CENTRAL | 19635B | Sligo | 247 | 23.50 | 32 | 2 |
| RATHCORMACK N S | 19408N | Sligo | 244 | 24.40 | 30 | 1 |
| ST EDWARDS N S | 17277O | Sligo | 207 | 18.27 | 21 | 0 |
| ST PATRICKS NS | 19942K | Sligo | 182 | 26.00 | 32 | 2 |
| ST BRENDANS NS | 19826I | Sligo | 177 | 23.57 | 31 | 1 |
| S N Realt na Mara | 17641J | Sligo | 117 | 23.40 | 29 | 0 |
| SOOEY N S | 18053U | Sligo | 112 | 22.40 | 27 | 0 |
| ARDKEERIN N S | 15217J | Sligo | 111 | 22.20 | 30 | 1 |
| S.N. Naomh Ailbhe | 20575Q | Sligo | 97 | 24.25 | 28 | 0 |
| CLIFFONEY N S | 16136O | Sligo | 96 | 24.00 | 31 | 1 |
| S N PADRAIG NAOFA | 17021C | Sligo | 75 | 25.00 | 28 | 0 |
| S N CLOCHOG | 18543O | Sligo | 61 | 20.33 | 22 | 0 |
| KILROSS N S | 16044J | Sligo | 42 | 21.00 | 24 | 0 |
| S N BHRIDE | 17725P | Sligo | 35 | 17.50 | 18 | 0 |
| S N MHUIRE | 15337T | Sligo | 15 | 7.50 | 10 | 0 |