Home · 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 gain in a single year: 1993/94: 477 in 1983/84 → 810, +333 pupils.
- Biggest loss in a single year: 1996/97: 778 in 1995/96 → 752, -26 pupils.
- Largest single-class increase: 6th Class in 2021/22 (195 → 207, +12).
- Largest single-class decrease: 4th Class in 2024/25 (196 → 185, -11).
- 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: 402 (1982/83) → 744 (2025/26 (preliminary)), 342.
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 |
402 |
810 |
729.4 |
35 |
Total enrolment over time
Total and gender trends use historical records where available. Class-level data starts in 2020/21.
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 |
| 1982/83 |
168 |
234 |
– |
– |
– |
– |
– |
– |
– |
– |
402 |
| 1983/84 |
193 |
284 |
– |
– |
– |
– |
– |
– |
– |
– |
477 |
| 1993/94 |
355 |
455 |
– |
– |
– |
– |
– |
– |
– |
– |
810 |
| 1994/95 |
343 |
448 |
– |
– |
– |
– |
– |
– |
– |
– |
791 |
| 1995/96 |
333 |
445 |
– |
– |
– |
– |
– |
– |
– |
– |
778 |
| 1996/97 |
336 |
416 |
– |
– |
– |
– |
– |
– |
– |
– |
752 |
| 1997/98 |
328 |
406 |
– |
– |
– |
– |
– |
– |
– |
– |
734 |
| 1998/99 |
335 |
410 |
– |
– |
– |
– |
– |
– |
– |
– |
745 |
| 1999/00 |
350 |
403 |
– |
– |
– |
– |
– |
– |
– |
– |
753 |
| 2000/01 |
367 |
395 |
– |
– |
– |
– |
– |
– |
– |
– |
762 |
| 2001/02 |
374 |
405 |
– |
– |
– |
– |
– |
– |
– |
– |
779 |
| 2002/03 |
368 |
392 |
– |
– |
– |
– |
– |
– |
– |
– |
760 |
| 2003/04 |
378 |
364 |
– |
– |
– |
– |
– |
– |
– |
– |
742 |
| 2004/05 |
357 |
377 |
– |
– |
– |
– |
– |
– |
– |
– |
734 |
| 2005/06 |
355 |
371 |
– |
– |
– |
– |
– |
– |
– |
– |
726 |
| 2006/07 |
356 |
376 |
– |
– |
– |
– |
– |
– |
– |
– |
732 |
| 2007/08 |
339 |
384 |
– |
– |
– |
– |
– |
– |
– |
– |
723 |
| 2008/09 |
342 |
367 |
– |
– |
– |
– |
– |
– |
– |
– |
709 |
| 2009/10 |
358 |
354 |
– |
– |
– |
– |
– |
– |
– |
– |
712 |
| 2010/11 |
356 |
333 |
– |
– |
– |
– |
– |
– |
– |
– |
689 |
| 2011/12 |
363 |
327 |
– |
– |
– |
– |
– |
– |
– |
– |
690 |
| 2012/13 |
366 |
338 |
– |
– |
– |
– |
– |
– |
– |
– |
704 |
| 2013/14 |
337 |
359 |
– |
– |
– |
– |
– |
– |
– |
– |
696 |
| 2014/15 |
339 |
374 |
– |
– |
– |
– |
– |
– |
– |
– |
713 |
| 2015/16 |
339 |
370 |
– |
– |
– |
– |
– |
– |
– |
– |
709 |
| 2016/17 |
354 |
390 |
– |
– |
– |
– |
– |
– |
– |
– |
744 |
| 2017/18 |
371 |
385 |
– |
– |
– |
– |
– |
– |
– |
– |
756 |
| 2018/19 |
371 |
393 |
– |
– |
– |
– |
– |
– |
– |
– |
764 |
| 2019/20 |
385 |
411 |
– |
– |
– |
– |
– |
– |
– |
– |
796 |
| 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 |