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S N CNOC AINBHIL

Roll number: 17979A Lower Kilmacud Road, Stillorgan, Co. Dublin

School details

Address: Lower Kilmacud Road, Stillorgan, Co. Dublin (A94E2N7)
Email: [email protected]
Phone: 012831148
Principal: Grainne McGowan
Ethos: Catholic
DEIS: N
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: Dun Laoghaire Rathdown
School patron: Archbishop of Dublin
School type: Ordinary
School level: All-Through School
Planning area: Goatstown_Stillorgan_DLR

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

24.11

2025/26

Mainstream classes

2025/26

Largest class group

2025/26

Classes with 30+ pupils

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	413	14	29.50	31	10
2007/08	412	14	29.43	31	10
2008/09	409	14	29.21	31	8
2009/10	418	15	27.87	31	4
2010/11	416	15	27.73	30	3
2011/12	411	15	27.40	29	0
2012/13	426	15	28.40	30	3
2013/14	464	16	29.00	31	8
2014/15	467	17	27.47	31	8
2015/16	466	17	27.41	31	6
2016/17	464	17	27.29	31	6
2017/18	464	17	27.29	30	6
2019/20	474	18	26.33	30	9
2020/21	473	18	26.28	30	8
2021/22	469	18	26.06	30	7
2022/23	467	19	24.58	31	7
2023/24	456	19	24.00	32	6
2024/25	440	19	23.16	30	1
2025/26	434	18	24.11	31	4

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1993/94: 315 in 1983/84 → 372, +57 pupils.
Biggest loss in a single year: 1975/76: 492 in 1974/75 → 433, -59 pupils.
Largest single-class increase: 6th Class in 2025/26 (62 → 68, +6).
Largest single-class decrease: 1st Class in 2025/26 (55 → 39, -16).
Largest cohort-step gain: 4th → 5th in 2025/26 (59 → 65, +6).
Largest cohort-step loss: JI → SI in 2024/25 (45 → 39, -6).
Overall: 492 (1974/75) → 434 (2025/26), -58.

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	45	60	50.8	6
Senior Infants	39	60	51.7	6
1st Class	39	60	55.2	6
2nd Class	55	60	58.2	6
3rd Class	57	61	59.7	6
4th Class	59	60	59.5	6
5th Class	59	65	61.8	6
6th Class	55	68	59.7	6
Total	315	492	407.6	43

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

Base cohort:

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 2020/21

JI 2020/21 60

-1

SI 2021/22 59

-1

1st 2022/23 58

-1

2nd 2023/24 57

3rd 2024/25 57

4th 2025/26 60

Cohort 2021/22

JI 2021/22 57

SI 2022/23 59

1st 2023/24 59

-1

2nd 2024/25 58

3rd 2025/26 61

Cohort 2022/23

JI 2022/23 52

SI 2023/24 53

1st 2024/25 55

2nd 2025/26 55

Cohort 2023/24

JI 2023/24 45

-6

SI 2024/25 39

1st 2025/26 39

Cohort 2024/25

JI 2024/25 45

-5

SI 2025/26 40

Cohort 2025/26

JI 2025/26 46

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	414	78	–	–	–	–	–	–	–	–	492
1975/76	–	–	–	–	–	–	–	–	–	–	433
1976/77	350	70	–	–	–	–	–	–	–	–	420
1977/78	324	57	–	–	–	–	–	–	–	–	381
1978/79	–	–	–	–	–	–	–	–	–	–	342
1979/80	272	46	–	–	–	–	–	–	–	–	318
1980/81	256	60	–	–	–	–	–	–	–	–	316
1981/82	256	63	–	–	–	–	–	–	–	–	319
1982/83	256	59	–	–	–	–	–	–	–	–	315
1983/84	261	54	–	–	–	–	–	–	–	–	315
1993/94	311	61	–	–	–	–	–	–	–	–	372
1994/95	352	50	–	–	–	–	–	–	–	–	402
1995/96	342	43	–	–	–	–	–	–	–	–	385
1996/97	353	34	–	–	–	–	–	–	–	–	387
1997/98	339	25	–	–	–	–	–	–	–	–	364
1998/99	351	12	–	–	–	–	–	–	–	–	363
1999/00	368	–	–	–	–	–	–	–	–	–	368
2000/01	378	–	–	–	–	–	–	–	–	–	378
2001/02	376	–	–	–	–	–	–	–	–	–	376
2002/03	384	–	–	–	–	–	–	–	–	–	384
2003/04	397	–	–	–	–	–	–	–	–	–	397
2004/05	392	–	–	–	–	–	–	–	–	–	392
2005/06	388	–	–	–	–	–	–	–	–	–	388
2006/07	413	–	–	–	–	–	–	–	–	–	413
2007/08	412	–	–	–	–	–	–	–	–	–	412
2008/09	409	–	–	–	–	–	–	–	–	–	409
2009/10	418	–	–	–	–	–	–	–	–	–	418
2010/11	416	–	–	–	–	–	–	–	–	–	416
2011/12	411	–	–	–	–	–	–	–	–	–	411
2012/13	426	–	–	–	–	–	–	–	–	–	426
2013/14	464	–	–	–	–	–	–	–	–	–	464
2014/15	467	–	–	–	–	–	–	–	–	–	467
2015/16	466	–	–	–	–	–	–	–	–	–	466
2016/17	464	–	–	–	–	–	–	–	–	–	464
2017/18	464	–	–	–	–	–	–	–	–	–	464
2018/19	477	–	–	–	–	–	–	–	–	–	477
2019/20	474	–	–	–	–	–	–	–	–	–	474
2020/21	473	–	60	60	60	60	59	60	59	55	473
2021/22	469	–	57	59	60	59	60	59	59	56	469
2022/23	467	–	52	59	58	60	61	59	60	58	467
2023/24	456	–	45	53	59	57	60	60	63	59	456
2024/25	440	–	45	39	55	58	57	59	65	62	440
2025/26	434	–	46	40	39	55	61	60	65	68	434