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OUR LADY OF GOOD COUNSEL BOYS N S

Roll number: 19320W Johnstown, Dún Laoghaire, Co. Dublin

School details

Address: Johnstown, Dún Laoghaire, Co. Dublin (A96AF10)
Email: [email protected]
Phone: 012851449
Principal: Neil Cadogan
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: Sallynoggin_Killiney_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

24.31

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	421	16	26.31	29	0
2007/08	425	16	26.56	30	1
2008/09	431	16	26.94	31	2
2009/10	424	16	26.50	31	2
2010/11	430	16	26.88	31	1
2011/12	433	16	27.06	31	3
2012/13	439	16	27.44	30	1
2013/14	438	16	27.38	30	1
2014/15	445	16	27.81	30	1
2015/16	432	16	27.00	30	1
2016/17	433	16	27.06	29	0
2017/18	417	16	26.06	28	0
2019/20	402	16	25.12	27	0
2020/21	391	16	24.44	26	0
2021/22	393	16	24.56	27	0
2022/23	386	16	24.12	26	0
2023/24	389	16	24.31	26	0
2024/25	383	16	23.94	27	0
2025/26	389	16	24.31	28	0

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1975/76: 579 in 1974/75 → 660, +81 pupils.
Biggest loss in a single year: 1993/94: 759 in 1983/84 → 551, -208 pupils.
Largest single-class increase: Junior Infants in 2025/26 (40 → 48, +8).
Largest single-class decrease: Junior Infants in 2024/25 (49 → 40, -9).
Largest cohort-step gain: 1st → 2nd in 2025/26 (47 → 51, +4).
Largest cohort-step loss: 5th → 6th in 2022/23 (51 → 47, -4).
Overall: 579 (1974/75) → 389 (2025/26), -190.

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	40	49	46.3	6
Senior Infants	40	48	46.3	6
1st Class	45	51	48.5	6
2nd Class	45	51	48.3	6
3rd Class	44	51	48.3	6
4th Class	46	52	50.3	6
5th Class	47	54	50.3	6
6th Class	47	55	50.0	6
Total	383	792	517.0	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 47

SI 2021/22 48

1st 2022/23 51

2nd 2023/24 51

3rd 2024/25 51

4th 2025/26 52

Cohort 2021/22

JI 2021/22 47

SI 2022/23 47

-2

1st 2023/24 45

2nd 2024/25 46

3rd 2025/26 46

Cohort 2022/23

JI 2022/23 47

SI 2023/24 47

1st 2024/25 47

2nd 2025/26 51

Cohort 2023/24

JI 2023/24 49

-1

SI 2024/25 48

1st 2025/26 50

Cohort 2024/25

JI 2024/25 40

SI 2025/26 40

Cohort 2025/26

JI 2025/26 48

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	–	579	–	–	–	–	–	–	–	–	579
1975/76	–	–	–	–	–	–	–	–	–	–	660
1976/77	–	718	–	–	–	–	–	–	–	–	718
1977/78	–	758	–	–	–	–	–	–	–	–	758
1978/79	–	–	–	–	–	–	–	–	–	–	767
1979/80	–	792	–	–	–	–	–	–	–	–	792
1980/81	–	756	–	–	–	–	–	–	–	–	756
1981/82	–	755	–	–	–	–	–	–	–	–	755
1982/83	–	736	–	–	–	–	–	–	–	–	736
1983/84	–	759	–	–	–	–	–	–	–	–	759
1993/94	–	551	–	–	–	–	–	–	–	–	551
1994/95	–	554	–	–	–	–	–	–	–	–	554
1995/96	–	552	–	–	–	–	–	–	–	–	552
1996/97	–	545	–	–	–	–	–	–	–	–	545
1997/98	–	541	–	–	–	–	–	–	–	–	541
1998/99	–	529	–	–	–	–	–	–	–	–	529
1999/00	–	514	–	–	–	–	–	–	–	–	514
2000/01	–	499	–	–	–	–	–	–	–	–	499
2001/02	–	488	–	–	–	–	–	–	–	–	488
2002/03	–	492	–	–	–	–	–	–	–	–	492
2003/04	–	478	–	–	–	–	–	–	–	–	478
2004/05	–	456	–	–	–	–	–	–	–	–	456
2005/06	–	441	–	–	–	–	–	–	–	–	441
2006/07	–	421	–	–	–	–	–	–	–	–	421
2007/08	–	425	–	–	–	–	–	–	–	–	425
2008/09	–	431	–	–	–	–	–	–	–	–	431
2009/10	–	424	–	–	–	–	–	–	–	–	424
2010/11	–	430	–	–	–	–	–	–	–	–	430
2011/12	–	433	–	–	–	–	–	–	–	–	433
2012/13	–	439	–	–	–	–	–	–	–	–	439
2013/14	–	438	–	–	–	–	–	–	–	–	438
2014/15	–	445	–	–	–	–	–	–	–	–	445
2015/16	–	432	–	–	–	–	–	–	–	–	432
2016/17	–	433	–	–	–	–	–	–	–	–	433
2017/18	–	417	–	–	–	–	–	–	–	–	417
2018/19	–	409	–	–	–	–	–	–	–	–	409
2019/20	–	402	–	–	–	–	–	–	–	–	402
2020/21	–	391	47	48	50	46	51	52	49	48	391
2021/22	–	393	47	48	48	51	47	52	51	49	393
2022/23	–	386	47	47	51	45	51	48	50	47	386
2023/24	–	389	49	47	45	51	44	52	51	50	389
2024/25	–	383	40	48	47	46	51	46	54	51	383
2025/26	–	389	48	40	50	51	46	52	47	55	389