By area · Release notes. Enrolment by planning area, local authority, school patron, county.
ST COLMCILLE SENIOR N S
Roll number: 19742C
Idrone Avenue, Knocklyon, Dublin 16
School details
- Address
- Idrone Avenue, Knocklyon, Dublin 16 (D16W8K0)
- Principal
- Brian Mc Gowan
- Ethos
- Catholic
- DEIS
- N
- Irish classification
- No subjects through Irish
- Gaeltacht
- N
- Island
- N
- Local authority
- South Dublin County Council
- School patron
- Archbishop of Dublin
- School type
- Ordinary
- School level
- Senior
- Planning area
- Rathfarnham
Preliminary data
The latest year shown (2025/26) is preliminary and subject to revision when the official enrolment figures are released by the Department of Education.
Data highlights
Key numbers to spot outliers or notable changes.
- Biggest loss in a single year: 2023/24: 782 in 2022/23 → 768, -14 pupils.
- Largest single-class increase: 6th Class in 2021/22 (195 → 207, +12).
- Largest single-class decrease: 5th Class in 2025/26 (preliminary) (201 → 0, -201).
- Largest cohort-step gain: 4th → 5th in 2024/25 (196 → 201, +5).
- Largest cohort-step loss: 3rd → 4th in 2021/22 (199 → 194, -5).
- Overall: 802 (2020/21) → 744 (2025/26 (preliminary)), -58.
Summary statistics (class-level data)
Min / max / mean enrolment per class across the available years (2020/21–2024/25; preliminary year excluded from class stats).
| Class |
Min |
Max |
Mean |
Years |
| 3rd Class |
180 |
199 |
191.2 |
5 |
| 4th Class |
185 |
202 |
194.0 |
5 |
| 5th Class |
192 |
206 |
198.8 |
5 |
| 6th Class |
191 |
207 |
196.8 |
5 |
| Total |
744 |
802 |
774.7 |
6 |
Total enrolment over time
Enrolment by gender over time
Enrolment by class over time
Raw data by year
Years marked (preliminary) are subject to revision when official data are published.
| Year |
Female |
Male |
JI |
SI |
1st |
2nd |
3rd |
4th |
5th |
6th |
Total |
| 2020/21 |
394 |
408 |
– |
– |
– |
– |
199 |
202 |
206 |
195 |
802 |
| 2021/22 |
397 |
398 |
– |
– |
– |
– |
193 |
194 |
201 |
207 |
795 |
| 2022/23 |
376 |
406 |
– |
– |
– |
– |
197 |
193 |
194 |
198 |
782 |
| 2023/24 |
367 |
401 |
– |
– |
– |
– |
187 |
196 |
192 |
193 |
768 |
| 2024/25 |
359 |
398 |
– |
– |
– |
– |
180 |
185 |
201 |
191 |
757 |
| 2025/26 (preliminary) |
355 |
389 |
– |
– |
– |
– |
– |
– |
– |
– |
744 |