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ST COLMCILLE SENIOR N S

Roll number: 19742C Idrone Avenue, Knocklyon, Dublin 16

School details

Address
Idrone Avenue, Knocklyon, Dublin 16 (D16W8K0)
Email
[email protected]
Phone
014942527
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

Class size history

Mainstream class group data is shown separately from standard/year-group enrolment data. The source does not identify which standard/year group each class group belongs to.

Average class size
25.66
2025/26
Mainstream classes
29
2025/26
Largest class group
27
2025/26
Classes with 30+ pupils
0
2025/26

Class group metrics trend

Class group metrics by year

Year Mainstream class pupils Mainstream classes Average class size Largest class Classes 30+
2006/07 724 24 30.17 32 18
2007/08 717 24 29.88 32 16
2008/09 702 24 29.25 32 13
2009/10 703 24 29.29 31 11
2010/11 681 24 28.38 31 5
2011/12 690 24 28.75 31 9
2012/13 704 24 29.33 31 10
2013/14 696 25 27.84 31 2
2014/15 713 26 27.42 31 3
2015/16 709 26 27.27 29 0
2016/17 744 27 27.56 29 0
2017/18 756 27 28.00 30 1
2019/20 796 29 27.45 31 2
2020/21 802 29 27.66 31 2
2021/22 795 29 27.41 30 1
2022/23 782 29 26.97 30 2
2023/24 768 29 26.48 29 0
2024/25 757 29 26.10 29 0
2025/26 744 29 25.66 27 0

Data highlights

Key numbers to spot outliers or notable changes.

Summary statistics (class-level data)

Min / max / mean enrolment per class across the available final by-standard years.

Class Min Max Mean Years
Junior Infants 0 0 0.0 1
Senior Infants 0 0 0.0 1
1st Class 0 0 0.0 1
2nd Class 0 0 0.0 1
3rd Class 180 199 189.7 6
4th Class 178 202 191.3 6
5th Class 183 206 196.2 6
6th Class 191 207 197.5 6
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

Cohort progression

Track how each cohort (pupils who were in the same class in the same year) progresses through the school. Each step shows the count; the number between steps is the net change (pupils gained minus pupils lost).

Cohort 2025/26
JI 2025/26 0

Raw data by year

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
2025/26 355 389 – – – – 182 178 183 201 744