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ST BRENDANS MONASTERY

Roll number: 12370C Moorpark Street, Birr, Co. Offaly

School details

Address: Moorpark Street, Birr, Co. Offaly (R42NW22)
Email: [email protected]
Phone: 0579121033
Principal: Niall Crofton
Ethos: Catholic
DEIS: Y
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: Offaly County Council
School patron: Bishop of Killaloe
School type: Ordinary with Special Classes
School level: All-Through School
Planning area: Birr

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

17.33

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	197	8	24.62	30	2
2007/08	211	9	23.44	32	2
2008/09	216	9	24.00	37	1
2009/10	215	10	21.50	30	1
2010/11	214	10	21.40	25	0
2011/12	238	10	23.80	28	0
2012/13	231	9	25.67	30	2
2013/14	218	9	24.22	30	1
2014/15	204	9	22.67	26	0
2015/16	208	9	23.11	27	0
2016/17	180	8	22.50	26	0
2017/18	173	8	21.62	24	0
2019/20	175	8	21.88	24	0
2020/21	169	8	21.12	24	0
2021/22	168	8	21.00	25	0
2022/23	159	9	17.67	24	0
2023/24	153	9	17.00	22	0
2024/25	168	9	18.67	24	0
2025/26	156	9	17.33	24	0

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1981/82: 320 in 1980/81 → 345, +25 pupils.
Biggest loss in a single year: 1993/94: 331 in 1983/84 → 250, -81 pupils.
Largest single-class increase: Senior Infants in 2024/25 (12 → 23, +11).
Largest single-class decrease: Junior Infants in 2022/23 (24 → 12, -12).
Largest cohort-step gain: 4th → 5th in 2025/26 (23 → 28, +5).
Largest cohort-step loss: 1st → 2nd in 2023/24 (19 → 16, -3).
Overall: 322 (1974/75) → 178 (2025/26), -144.

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	12	24	18.7	6
Senior Infants	12	24	20.2	6
1st Class	14	23	20.2	6
2nd Class	16	24	20.2	6
3rd Class	18	27	21.3	6
4th Class	17	23	21.0	6
5th Class	18	28	21.8	6
6th Class	18	25	22.5	6
Total	175	345	238.6	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 21

-1

SI 2021/22 20

-1

1st 2022/23 19

-3

2nd 2023/24 16

3rd 2024/25 20

4th 2025/26 22

Cohort 2021/22

JI 2021/22 24

SI 2022/23 24

-1

1st 2023/24 23

2nd 2024/25 23

3rd 2025/26 27

Cohort 2022/23

JI 2022/23 12

SI 2023/24 12

1st 2024/25 14

2nd 2025/26 17

Cohort 2023/24

JI 2023/24 19

SI 2024/25 23

-1

1st 2025/26 22

Cohort 2024/25

JI 2024/25 19

SI 2025/26 21

Cohort 2025/26

JI 2025/26 17

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	–	322	–	–	–	–	–	–	–	–	322
1975/76	–	–	–	–	–	–	–	–	–	–	322
1976/77	–	312	–	–	–	–	–	–	–	–	312
1977/78	–	318	–	–	–	–	–	–	–	–	318
1978/79	–	322	–	–	–	–	–	–	–	–	322
1979/80	–	322	–	–	–	–	–	–	–	–	322
1980/81	–	320	–	–	–	–	–	–	–	–	320
1981/82	–	345	–	–	–	–	–	–	–	–	345
1982/83	–	337	–	–	–	–	–	–	–	–	337
1983/84	–	331	–	–	–	–	–	–	–	–	331
1993/94	–	250	–	–	–	–	–	–	–	–	250
1994/95	–	243	–	–	–	–	–	–	–	–	243
1995/96	–	231	–	–	–	–	–	–	–	–	231
1996/97	–	238	–	–	–	–	–	–	–	–	238
1997/98	–	226	–	–	–	–	–	–	–	–	226
1998/99	–	222	–	–	–	–	–	–	–	–	222
1999/00	–	224	–	–	–	–	–	–	–	–	224
2000/01	–	222	–	–	–	–	–	–	–	–	222
2001/02	–	217	–	–	–	–	–	–	–	–	217
2002/03	–	210	–	–	–	–	–	–	–	–	210
2003/04	–	211	–	–	–	–	–	–	–	–	211
2004/05	–	196	–	–	–	–	–	–	–	–	196
2005/06	–	204	–	–	–	–	–	–	–	–	204
2006/07	–	213	–	–	–	–	–	–	–	–	213
2007/08	–	227	–	–	–	–	–	–	–	–	227
2008/09	–	236	–	–	–	–	–	–	–	–	236
2009/10	–	236	–	–	–	–	–	–	–	–	236
2010/11	–	238	–	–	–	–	–	–	–	–	238
2011/12	–	238	–	–	–	–	–	–	–	–	238
2012/13	–	231	–	–	–	–	–	–	–	–	231
2013/14	–	218	–	–	–	–	–	–	–	–	218
2014/15	–	211	–	–	–	–	–	–	–	–	211
2015/16	–	219	–	–	–	–	–	–	–	–	219
2016/17	–	192	–	–	–	–	–	–	–	–	192
2017/18	–	183	–	–	–	–	–	–	–	–	183
2018/19	–	185	–	–	–	–	–	–	–	–	185
2019/20	–	193	–	–	–	–	–	–	–	–	193
2020/21	–	186	21	21	20	22	18	21	22	24	186
2021/22	–	188	24	20	23	19	21	17	19	25	188
2022/23	–	178	12	24	19	24	20	22	18	20	178
2023/24	–	175	19	12	23	16	22	21	22	18	175
2024/25	–	189	19	23	14	23	20	23	22	24	189
2025/26	–	178	17	21	22	17	27	22	28	24	178