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ST BRIGIDS BOYS N S

Roll number: 16352U Mart Lane, Foxrock, Dublin 18

School details

Address: Mart Lane, Foxrock, Dublin 18 (D18W406)
Email: [email protected]
Phone: 012893199
Principal: Fiona Griffin
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

25.38

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	459	16	28.69	32	4
2007/08	459	16	28.69	31	6
2008/09	467	16	29.19	32	8
2009/10	470	16	29.38	32	8
2010/11	467	16	29.19	32	8
2011/12	474	16	29.62	33	7
2012/13	484	16	30.25	34	11
2013/14	489	16	30.56	34	11
2014/15	500	16	31.25	34	12
2015/16	513	16	32.06	34	13
2016/17	508	16	31.75	34	13
2017/18	502	16	31.38	34	12
2019/20	484	16	30.25	32	13
2020/21	458	17	26.94	31	5
2021/22	452	18	25.11	30	2
2022/23	441	16	27.56	31	5
2023/24	420	16	26.25	30	1
2024/25	409	16	25.56	28	0
2025/26	406	16	25.38	28	0

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1993/94: 395 in 1983/84 → 516, +121 pupils.
Biggest loss in a single year: 1998/99: 509 in 1997/98 → 479, -30 pupils.
Largest single-class increase: Senior Infants in 2021/22 (51 → 61, +10).
Largest single-class decrease: Junior Infants in 2024/25 (52 → 41, -11).
Largest cohort-step gain: JI → SI in 2025/26 (41 → 45, +4).
Largest cohort-step loss: 2nd → 3rd in 2025/26 (56 → 47, -9).
Overall: 428 (1974/75) → 406 (2025/26), -22.

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	41	60	53.0	6
Senior Infants	45	61	54.3	6
1st Class	51	61	56.0	6
2nd Class	49	58	54.7	6
3rd Class	47	57	50.8	6
4th Class	45	60	53.5	6
5th Class	48	61	55.2	6
6th Class	46	59	53.5	6
Total	395	531	466.2	42

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

SI 2021/22 61

1st 2022/23 61

-3

2nd 2023/24 58

-4

3rd 2024/25 54

4th 2025/26 55

Cohort 2021/22

JI 2021/22 60

SI 2022/23 60

-3

1st 2023/24 57

-1

2nd 2024/25 56

-9

3rd 2025/26 47

Cohort 2022/23

JI 2022/23 56

SI 2023/24 56

1st 2024/25 56

-2

2nd 2025/26 54

Cohort 2023/24

JI 2023/24 52

SI 2024/25 53

1st 2025/26 54

Cohort 2024/25

JI 2024/25 41

SI 2025/26 45

Cohort 2025/26

JI 2025/26 49

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	–	428	–	–	–	–	–	–	–	–	428
1975/76	–	–	–	–	–	–	–	–	–	–	475
1976/77	–	482	–	–	–	–	–	–	–	–	482
1977/78	–	467	–	–	–	–	–	–	–	–	467
1979/80	–	453	–	–	–	–	–	–	–	–	453
1980/81	–	436	–	–	–	–	–	–	–	–	436
1981/82	–	421	–	–	–	–	–	–	–	–	421
1982/83	–	411	–	–	–	–	–	–	–	–	411
1983/84	–	395	–	–	–	–	–	–	–	–	395
1993/94	–	516	–	–	–	–	–	–	–	–	516
1994/95	–	531	–	–	–	–	–	–	–	–	531
1995/96	–	530	–	–	–	–	–	–	–	–	530
1996/97	–	523	–	–	–	–	–	–	–	–	523
1997/98	–	509	–	–	–	–	–	–	–	–	509
1998/99	–	479	–	–	–	–	–	–	–	–	479
1999/00	–	455	–	–	–	–	–	–	–	–	455
2000/01	–	459	–	–	–	–	–	–	–	–	459
2001/02	–	453	–	–	–	–	–	–	–	–	453
2002/03	–	446	–	–	–	–	–	–	–	–	446
2003/04	–	447	–	–	–	–	–	–	–	–	447
2004/05	–	452	–	–	–	–	–	–	–	–	452
2005/06	–	455	–	–	–	–	–	–	–	–	455
2006/07	–	459	–	–	–	–	–	–	–	–	459
2007/08	–	459	–	–	–	–	–	–	–	–	459
2008/09	–	467	–	–	–	–	–	–	–	–	467
2009/10	–	470	–	–	–	–	–	–	–	–	470
2010/11	–	467	–	–	–	–	–	–	–	–	467
2011/12	–	474	–	–	–	–	–	–	–	–	474
2012/13	–	484	–	–	–	–	–	–	–	–	484
2013/14	–	489	–	–	–	–	–	–	–	–	489
2014/15	–	500	–	–	–	–	–	–	–	–	500
2015/16	–	513	–	–	–	–	–	–	–	–	513
2016/17	–	508	–	–	–	–	–	–	–	–	508
2017/18	–	502	–	–	–	–	–	–	–	–	502
2018/19	–	497	–	–	–	–	–	–	–	–	497
2019/20	–	484	–	–	–	–	–	–	–	–	484
2020/21	–	458	60	51	57	57	57	60	61	55	458
2021/22	–	452	60	61	51	54	52	57	58	59	452
2022/23	–	441	56	60	61	49	47	52	57	59	441
2023/24	–	420	52	56	57	58	48	45	51	53	420
2024/25	–	409	41	53	56	56	54	52	48	49	409
2025/26	–	406	49	45	54	54	47	55	56	46	406