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St Marys National School

Roll number: 16377N Orilia Terrace,, Cobh, Co. Cork

School details

Address: Orilia Terrace,, Cobh, Co. Cork (P24FR98)
Email: [email protected]
Phone: 0214812038
Principal: Fiona O'Callaghan
Ethos: Catholic
DEIS: N
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: Cork County Council
School patron: Bishop of Cloyne
School type: Ordinary with Special Classes
School level: All-Through School
Planning area: Cobh

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

21.18

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	403	15	26.87	34	3
2007/08	421	15	28.07	32	5
2008/09	405	16	25.31	31	1
2009/10	407	15	27.13	32	4
2010/11	396	15	26.40	32	2
2011/12	371	15	24.73	31	3
2012/13	340	14	24.29	33	1
2013/14	318	13	24.46	29	0
2014/15	331	12	27.58	36	3
2015/16	335	12	27.92	34	6
2016/17	340	13	26.15	32	2
2017/18	335	13	25.77	32	3
2019/20	327	13	25.15	28	0
2020/21	304	14	21.71	26	0
2021/22	280	12	23.33	28	0
2022/23	267	11	24.27	30	2
2023/24	232	11	21.09	28	0
2024/25	247	10	24.70	31	3
2025/26	233	11	21.18	32	1

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1976/77: 730 in 1975/76 → 786, +56 pupils.
Biggest loss in a single year: 1993/94: 670 in 1982/83 → 462, -208 pupils.
Largest single-class increase: Senior Infants in 2025/26 (17 → 50, +33).
Largest single-class decrease: Junior Infants in 2025/26 (42 → 21, -21).
Largest cohort-step gain: JI → SI in 2025/26 (42 → 50, +8).
Largest cohort-step loss: 1st → 2nd in 2021/22 (38 → 34, -4).
Overall: 730 (1975/76) → 248 (2025/26), -482.

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	18	42	26.3	6
Senior Infants	17	50	29.3	6
1st Class	21	38	27.7	6
2nd Class	23	35	29.3	6
3rd Class	25	42	32.8	6
4th Class	31	48	37.3	6
5th Class	32	49	39.8	6
6th Class	36	50	41.2	6
Total	237	786	446.5	41

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 30

-2

SI 2021/22 28

1st 2022/23 30

-1

2nd 2023/24 29

3rd 2024/25 31

4th 2025/26 33

Cohort 2021/22

JI 2021/22 23

SI 2022/23 24

-1

1st 2023/24 23

2nd 2024/25 23

3rd 2025/26 25

Cohort 2022/23

JI 2022/23 24

SI 2023/24 24

1st 2024/25 24

2nd 2025/26 25

Cohort 2023/24

JI 2023/24 18

-1

SI 2024/25 17

1st 2025/26 21

Cohort 2024/25

JI 2024/25 42

SI 2025/26 50

Cohort 2025/26

JI 2025/26 21

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1975/76	–	–	–	–	–	–	–	–	–	–	730
1976/77	615	171	–	–	–	–	–	–	–	–	786
1977/78	610	160	–	–	–	–	–	–	–	–	770
1978/79	591	162	–	–	–	–	–	–	–	–	753
1979/80	593	167	–	–	–	–	–	–	–	–	760
1980/81	577	159	–	–	–	–	–	–	–	–	736
1981/82	566	156	–	–	–	–	–	–	–	–	722
1982/83	523	147	–	–	–	–	–	–	–	–	670
1993/94	381	81	–	–	–	–	–	–	–	–	462
1994/95	364	77	–	–	–	–	–	–	–	–	441
1995/96	351	90	–	–	–	–	–	–	–	–	441
1996/97	342	93	–	–	–	–	–	–	–	–	435
1997/98	350	96	–	–	–	–	–	–	–	–	446
1998/99	345	96	–	–	–	–	–	–	–	–	441
1999/00	362	88	–	–	–	–	–	–	–	–	450
2000/01	370	83	–	–	–	–	–	–	–	–	453
2001/02	366	79	–	–	–	–	–	–	–	–	445
2002/03	354	79	–	–	–	–	–	–	–	–	433
2003/04	364	59	–	–	–	–	–	–	–	–	423
2004/05	344	69	–	–	–	–	–	–	–	–	413
2005/06	354	70	–	–	–	–	–	–	–	–	424
2006/07	334	69	–	–	–	–	–	–	–	–	403
2007/08	334	87	–	–	–	–	–	–	–	–	421
2008/09	333	77	–	–	–	–	–	–	–	–	410
2009/10	326	81	–	–	–	–	–	–	–	–	407
2010/11	331	74	–	–	–	–	–	–	–	–	405
2011/12	327	44	–	–	–	–	–	–	–	–	371
2012/13	329	11	–	–	–	–	–	–	–	–	340
2013/14	314	4	–	–	–	–	–	–	–	–	318
2014/15	331	–	–	–	–	–	–	–	–	–	331
2015/16	335	–	–	–	–	–	–	–	–	–	335
2016/17	340	–	–	–	–	–	–	–	–	–	340
2017/18	335	–	–	–	–	–	–	–	–	–	335
2018/19	333	–	–	–	–	–	–	–	–	–	333
2019/20	327	–	–	–	–	–	–	–	–	–	327
2020/21	304	–	30	33	38	35	42	48	42	36	304
2021/22	280	–	23	28	30	34	34	40	49	42	280
2022/23	267	–	24	24	30	30	35	34	40	50	267
2023/24	237	–	18	24	23	29	30	38	33	42	237
2024/25	259	–	42	17	24	23	31	31	43	36	259
2025/26	248	–	21	50	21	25	25	33	32	41	248