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SCOIL CAOIMHIN NAOFA

Roll number: 17954H Mount Merrion, Blackrock, Co. Dublin

School details

Address: Mount Merrion, Blackrock, Co. Dublin (A94KW94)
Email: [email protected]
Phone: 012887108
Principal: Siobhan McDonagh
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: Dunlaoghaire

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

25.18

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	291	11	26.45	34	4
2007/08	302	12	25.17	34	4
2008/09	322	13	24.77	33	2
2009/10	323	12	26.92	34	4
2010/11	314	13	24.15	33	2
2011/12	340	13	26.15	33	4
2012/13	383	14	27.36	33	4
2013/14	430	16	26.88	33	4
2014/15	408	16	25.50	29	0
2015/16	431	16	26.94	32	4
2016/17	443	16	27.69	33	6
2017/18	459	16	28.69	32	7
2019/20	456	17	26.82	31	4
2020/21	446	17	26.24	31	3
2021/22	422	17	24.82	30	1
2022/23	431	17	25.35	30	3
2023/24	427	17	25.12	30	1
2024/25	420	17	24.71	28	0
2025/26	428	17	25.18	30	1

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 2013/14: 383 in 2012/13 → 430, +47 pupils.
Biggest loss in a single year: 1975/76: 597 in 1974/75 → 516, -81 pupils.
Largest single-class increase: Junior Infants in 2023/24 (51 → 60, +9).
Largest single-class decrease: 6th Class in 2021/22 (74 → 55, -19).
Largest cohort-step gain: 4th → 5th in 2025/26 (50 → 56, +6).
Largest cohort-step loss: JI → SI in 2024/25 (60 → 53, -7).
Overall: 597 (1974/75) → 428 (2025/26), -169.

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	46	60	52.0	6
Senior Infants	49	53	51.3	6
1st Class	49	56	52.5	6
2nd Class	45	55	50.7	6
3rd Class	49	57	51.5	6
4th Class	50	61	54.2	6
5th Class	52	60	56.5	6
6th Class	55	74	60.3	6
Total	248	597	371.6	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 46

SI 2021/22 49

1st 2022/23 49

-3

2nd 2023/24 46

3rd 2024/25 50

4th 2025/26 51

Cohort 2021/22

JI 2021/22 51

SI 2022/23 53

1st 2023/24 56

-3

2nd 2024/25 53

-2

3rd 2025/26 51

Cohort 2022/23

JI 2022/23 51

SI 2023/24 51

1st 2024/25 53

2nd 2025/26 55

Cohort 2023/24

JI 2023/24 60

-7

SI 2024/25 53

-2

1st 2025/26 51

Cohort 2024/25

JI 2024/25 49

SI 2025/26 50

Cohort 2025/26

JI 2025/26 55

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	–	597	–	–	–	–	–	–	–	–	597
1975/76	–	–	–	–	–	–	–	–	–	–	516
1976/77	–	464	–	–	–	–	–	–	–	–	464
1977/78	–	413	–	–	–	–	–	–	–	–	413
1978/79	–	–	–	–	–	–	–	–	–	–	385
1979/80	–	336	–	–	–	–	–	–	–	–	336
1980/81	–	320	–	–	–	–	–	–	–	–	320
1981/82	–	281	–	–	–	–	–	–	–	–	281
1982/83	–	273	–	–	–	–	–	–	–	–	273
1983/84	–	282	–	–	–	–	–	–	–	–	282
1993/94	–	273	–	–	–	–	–	–	–	–	273
1994/95	–	248	–	–	–	–	–	–	–	–	248
1995/96	–	267	–	–	–	–	–	–	–	–	267
1996/97	–	302	–	–	–	–	–	–	–	–	302
1997/98	–	341	–	–	–	–	–	–	–	–	341
1998/99	–	361	–	–	–	–	–	–	–	–	361
1999/00	–	355	–	–	–	–	–	–	–	–	355
2000/01	–	360	–	–	–	–	–	–	–	–	360
2001/02	–	369	–	–	–	–	–	–	–	–	369
2002/03	–	366	–	–	–	–	–	–	–	–	366
2003/04	–	348	–	–	–	–	–	–	–	–	348
2004/05	–	313	–	–	–	–	–	–	–	–	313
2005/06	13	283	–	–	–	–	–	–	–	–	296
2006/07	28	263	–	–	–	–	–	–	–	–	291
2007/08	46	256	–	–	–	–	–	–	–	–	302
2008/09	49	273	–	–	–	–	–	–	–	–	322
2009/10	66	257	–	–	–	–	–	–	–	–	323
2010/11	71	243	–	–	–	–	–	–	–	–	314
2011/12	90	250	–	–	–	–	–	–	–	–	340
2012/13	109	274	–	–	–	–	–	–	–	–	383
2013/14	126	304	–	–	–	–	–	–	–	–	430
2014/15	112	296	–	–	–	–	–	–	–	–	408
2015/16	122	309	–	–	–	–	–	–	–	–	431
2016/17	142	301	–	–	–	–	–	–	–	–	443
2017/18	152	307	–	–	–	–	–	–	–	–	459
2018/19	153	285	–	–	–	–	–	–	–	–	438
2019/20	161	295	–	–	–	–	–	–	–	–	456
2020/21	154	292	46	52	53	45	57	61	58	74	446
2021/22	152	270	51	49	53	51	49	57	57	55	422
2022/23	168	263	51	53	49	54	53	52	60	59	431
2023/24	166	261	60	51	56	46	49	54	52	59	427
2024/25	143	277	49	53	53	53	50	50	56	56	420
2025/26	143	285	55	50	51	55	51	51	56	59	428