| School | Roll number | County | Total (latest year) | Latest average class size | Largest class | Classes 30+ |
|---|---|---|---|---|---|---|
| Scoil Mhuire | 20432R | Leitrim | 442 | 27.62 | 33 | 8 |
| FOUR MASTERS NS | 20079E | Leitrim | 289 | 25.18 | 32 | 1 |
| ST PATRICKS NS | 19423J | Leitrim | 243 | 25.11 | 33 | 1 |
| MOHILL N S | 20203C | Leitrim | 239 | 29.12 | 32 | 6 |
| Scoil Chlann Naofa | 20483L | Leitrim | 237 | 26.33 | 32 | 3 |
| LEITRIM MXD N S | 01125B | Leitrim | 220 | 27.50 | 30 | 3 |
| St Clare's National School | 17233R | Leitrim | 204 | 22.67 | 33 | 1 |
| GAELSCOIL LIATROMA | 20212D | Leitrim | 203 | 24.62 | 33 | 2 |
| ANNADUFF MXD N S | 13656C | Leitrim | 191 | 22.38 | 28 | 0 |
| CARRIGALLEN N S | 16474L | Leitrim | 181 | 22.29 | 34 | 1 |
| DRUMLEASE N S | 15382B | Leitrim | 152 | 25.00 | 31 | 1 |
| ST BRIDS | 19519W | Leitrim | 142 | 22.33 | 24 | 0 |
| SCOIL MHUIRE | 19554B | Leitrim | 124 | 24.80 | 28 | 0 |
| NAOMH CAILLIN | 15194A | Leitrim | 115 | 23.00 | 32 | 1 |
| GORTLETTERAGH CENTRAL | 15960P | Leitrim | 72 | 24.00 | 26 | 0 |
| Gaelscoil Chluainín | 20260O | Leitrim | 69 | 15.50 | 26 | 0 |
| DRUMKEERIN CENTRAL NS | 19360L | Leitrim | 67 | 22.33 | 28 | 0 |
| FAITIMA N S | 18741S | Leitrim | 63 | 21.00 | 28 | 0 |
| ST JOSEPHS N S | 16130C | Leitrim | 56 | 18.67 | 24 | 0 |
| S N NAOMH BRIGHID | 18492A | Leitrim | 55 | 18.33 | 22 | 0 |
| ST MICHAELS NS | 19255O | Leitrim | 51 | 17.00 | 21 | 0 |
| St. Hugh's N.S. | 18181G | Leitrim | 51 | 17.00 | 18 | 0 |
| Achadh na Sileann | 19365V | Leitrim | 47 | 15.67 | 19 | 0 |
| AUGHAVAS NS | 14339S | Leitrim | 42 | 21.00 | 28 | 0 |
| S N NAOMH MHUIRE | 19600F | Leitrim | 35 | 17.50 | 20 | 0 |
| MASTERSONS N S | 08390J | Leitrim | 34 | 17.00 | 19 | 0 |
| DIFFEREEN N S | 17125O | Leitrim | 33 | 16.50 | 18 | 0 |
| BALLAGHAMEEHAN N S | 13908D | Leitrim | 32 | 16.00 | 19 | 0 |
| ARDVARNEY MXD N S | 15116D | Leitrim | 30 | 15.00 | 17 | 0 |
| AUGHAWILLAN NS | 16932P | Leitrim | 30 | 15.00 | 18 | 0 |
| DRUMEELA N S | 14898I | Leitrim | 30 | 15.00 | 17 | 0 |
| NEWTOWNGORE N S 1 | 09353I | Leitrim | 30 | 15.00 | 17 | 0 |
| S N NAOMH MHUIRE | 18329M | Leitrim | 30 | 15.00 | 16 | 0 |
| GLEBE N S | 17206O | Leitrim | 27 | 13.50 | 15 | 0 |
| THE HUNT N S | 08673V | Leitrim | 18 | 9.00 | 12 | 0 |
| S N NAOMH PADRAIG | 18139H | Leitrim | 13 | 6.50 | 7 | 0 |
| S N MHIC DIARMADA | 18589P | Leitrim | 11 | 5.50 | 6 | 0 |