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BLESSED OLIVER N S

Roll number: 17569E Balrothery, Balbriggan, Co. Dublin

School details

Address: Balrothery, Balbriggan, Co. Dublin (K32WR94)
Email: [email protected]
Phone: 018411494
Principal: Mairéad Murphy
Ethos: Catholic
DEIS: N
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: Fingal County Council
School patron: Archbishop of Dublin
School type: Ordinary
School level: All-Through School
Planning area: Balbriggan

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

22.92

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	314	11	28.55	31	4
2007/08	325	12	27.08	32	3
2008/09	337	12	28.08	32	2
2009/10	349	12	29.08	30	4
2010/11	344	12	28.67	33	4
2011/12	341	12	28.42	30	2
2012/13	341	12	28.42	30	5
2013/14	342	12	28.50	30	5
2014/15	343	12	28.58	31	4
2015/16	343	12	28.58	31	5
2016/17	341	12	28.42	31	4
2017/18	338	12	28.17	31	4
2019/20	328	12	27.33	31	3
2020/21	329	12	27.42	30	2
2021/22	319	12	26.58	30	2
2022/23	317	12	26.42	30	2
2023/24	318	12	26.50	30	1
2024/25	307	12	25.58	33	1
2025/26	298	13	22.92	28	0

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1993/94: 237 in 1983/84 → 309, +72 pupils.
Biggest loss in a single year: 1977/78: 357 in 1976/77 → 302, -55 pupils.
Largest single-class increase: 6th Class in 2022/23 (40 → 46, +6).
Largest single-class decrease: 3rd Class in 2025/26 (43 → 32, -11).
Largest cohort-step gain: 1st → 2nd in 2023/24 (39 → 42, +3).
Largest cohort-step loss: SI → 1st in 2022/23 (42 → 39, -3).
Overall: 384 (1974/75) → 298 (2025/26), -86.

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	32	43	36.2	6
Senior Infants	32	42	37.0	6
1st Class	34	39	37.5	6
2nd Class	33	42	38.2	6
3rd Class	32	43	39.3	6
4th Class	40	45	41.3	6
5th Class	38	47	42.5	6
6th Class	38	46	42.7	6
Total	237	384	318.8	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 43

-1

SI 2021/22 42

-3

1st 2022/23 39

2nd 2023/24 42

3rd 2024/25 43

-1

4th 2025/26 42

Cohort 2021/22

JI 2021/22 33

-1

SI 2022/23 32

1st 2023/24 34

-1

2nd 2024/25 33

-1

3rd 2025/26 32

Cohort 2022/23

JI 2022/23 38

-1

SI 2023/24 37

1st 2024/25 37

2nd 2025/26 38

Cohort 2023/24

JI 2023/24 37

SI 2024/25 39

-1

1st 2025/26 38

Cohort 2024/25

JI 2024/25 34

SI 2025/26 35

Cohort 2025/26

JI 2025/26 32

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	158	226	–	–	–	–	–	–	–	–	384
1975/76	–	–	–	–	–	–	–	–	–	–	380
1976/77	137	220	–	–	–	–	–	–	–	–	357
1977/78	116	186	–	–	–	–	–	–	–	–	302
1978/79	–	–	–	–	–	–	–	–	–	–	303
1979/80	122	181	–	–	–	–	–	–	–	–	303
1980/81	118	162	–	–	–	–	–	–	–	–	280
1981/82	104	145	–	–	–	–	–	–	–	–	249
1982/83	102	141	–	–	–	–	–	–	–	–	243
1983/84	104	133	–	–	–	–	–	–	–	–	237
1993/94	151	158	–	–	–	–	–	–	–	–	309
1994/95	152	163	–	–	–	–	–	–	–	–	315
1995/96	155	160	–	–	–	–	–	–	–	–	315
1996/97	145	154	–	–	–	–	–	–	–	–	299
1997/98	142	154	–	–	–	–	–	–	–	–	296
1998/99	140	167	–	–	–	–	–	–	–	–	307
1999/00	137	164	–	–	–	–	–	–	–	–	301
2000/01	146	155	–	–	–	–	–	–	–	–	301
2001/02	144	158	–	–	–	–	–	–	–	–	302
2002/03	143	173	–	–	–	–	–	–	–	–	316
2003/04	143	178	–	–	–	–	–	–	–	–	321
2004/05	149	178	–	–	–	–	–	–	–	–	327
2005/06	157	170	–	–	–	–	–	–	–	–	327
2006/07	162	158	–	–	–	–	–	–	–	–	320
2007/08	177	157	–	–	–	–	–	–	–	–	334
2008/09	184	162	–	–	–	–	–	–	–	–	346
2009/10	190	159	–	–	–	–	–	–	–	–	349
2010/11	179	165	–	–	–	–	–	–	–	–	344
2011/12	179	162	–	–	–	–	–	–	–	–	341
2012/13	166	175	–	–	–	–	–	–	–	–	341
2013/14	167	175	–	–	–	–	–	–	–	–	342
2014/15	166	177	–	–	–	–	–	–	–	–	343
2015/16	167	176	–	–	–	–	–	–	–	–	343
2016/17	165	176	–	–	–	–	–	–	–	–	341
2017/18	165	173	–	–	–	–	–	–	–	–	338
2018/19	161	176	–	–	–	–	–	–	–	–	337
2019/20	157	171	–	–	–	–	–	–	–	–	328
2020/21	171	158	43	37	39	38	40	45	42	45	329
2021/22	159	160	33	42	38	38	40	41	47	40	319
2022/23	157	160	38	32	39	40	40	40	42	46	317
2023/24	156	162	37	37	34	42	41	40	43	44	318
2024/25	142	165	34	39	37	33	43	40	38	43	307
2025/26	138	160	32	35	38	38	32	42	43	38	298