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ST COLUMBAS CON G & I

Roll number: 16659A Iona Road, Glasnevin, Dublin 9

School details

Address: Iona Road, Glasnevin, Dublin 9 (D09YX46)
Email: [email protected]
Phone: 018305040
Principal: Eileen Whelan
Ethos: Catholic
DEIS: N
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: Dublin City Council
School patron: Archbishop of Dublin
School type: Ordinary
School level: All-Through School
Planning area: Drumcondra_Marino_Dublin1

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

23.62

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	391	14	27.93	33	5
2007/08	380	14	27.14	33	5
2008/09	376	14	26.86	32	3
2009/10	380	14	27.14	32	4
2010/11	381	14	27.21	32	3
2011/12	387	14	27.64	34	5
2012/13	386	14	27.57	33	3
2013/14	391	14	27.93	34	4
2014/15	381	14	27.21	31	5
2015/16	398	14	28.43	35	8
2016/17	402	15	26.80	33	6
2017/18	388	15	25.87	33	4
2019/20	392	15	26.13	29	0
2020/21	378	15	25.20	29	0
2021/22	371	15	24.73	28	0
2022/23	370	15	24.67	32	1
2023/24	368	15	24.53	29	0
2024/25	371	15	24.73	29	0
2025/26	378	16	23.62	29	0

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1975/76: 524 in 1974/75 → 547, +23 pupils.
Biggest loss in a single year: 1979/80: 522 in 1978/79 → 492, -30 pupils.
Largest single-class increase: 3rd Class in 2025/26 (43 → 57, +14).
Largest single-class decrease: 5th Class in 2022/23 (53 → 40, -13).
Largest cohort-step gain: 1st → 2nd in 2025/26 (50 → 54, +4).
Largest cohort-step loss: 2nd → 3rd in 2022/23 (46 → 41, -5).
Overall: 524 (1974/75) → 378 (2025/26), -146.

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	45	56	51.3	6
Senior Infants	47	57	51.0	6
1st Class	43	55	49.3	6
2nd Class	39	56	46.8	6
3rd Class	39	57	43.2	6
4th Class	40	52	43.0	6
5th Class	38	53	42.7	6
6th Class	37	58	45.3	6
Total	368	547	428.6	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 49

-2

SI 2021/22 47

-3

1st 2022/23 44

2nd 2023/24 44

-1

3rd 2024/25 43

4th 2025/26 43

Cohort 2021/22

JI 2021/22 56

SI 2022/23 57

-2

1st 2023/24 55

2nd 2024/25 56

3rd 2025/26 57

Cohort 2022/23

JI 2022/23 55

-2

SI 2023/24 53

-3

1st 2024/25 50

2nd 2025/26 54

Cohort 2023/24

JI 2023/24 55

SI 2024/25 55

1st 2025/26 55

Cohort 2024/25

JI 2024/25 48

-1

SI 2025/26 47

Cohort 2025/26

JI 2025/26 45

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	434	90	–	–	–	–	–	–	–	–	524
1975/76	–	–	–	–	–	–	–	–	–	–	547
1976/77	444	89	–	–	–	–	–	–	–	–	533
1977/78	452	92	–	–	–	–	–	–	–	–	544
1978/79	439	83	–	–	–	–	–	–	–	–	522
1979/80	420	72	–	–	–	–	–	–	–	–	492
1980/81	418	74	–	–	–	–	–	–	–	–	492
1981/82	405	80	–	–	–	–	–	–	–	–	485
1982/83	412	68	–	–	–	–	–	–	–	–	480
1993/94	398	76	–	–	–	–	–	–	–	–	474
1994/95	405	64	–	–	–	–	–	–	–	–	469
1995/96	415	44	–	–	–	–	–	–	–	–	459
1996/97	417	51	–	–	–	–	–	–	–	–	468
1997/98	425	44	–	–	–	–	–	–	–	–	469
1998/99	432	29	–	–	–	–	–	–	–	–	461
1999/00	428	27	–	–	–	–	–	–	–	–	455
2000/01	421	22	–	–	–	–	–	–	–	–	443
2001/02	398	30	–	–	–	–	–	–	–	–	428
2002/03	390	29	–	–	–	–	–	–	–	–	419
2003/04	385	17	–	–	–	–	–	–	–	–	402
2004/05	358	18	–	–	–	–	–	–	–	–	376
2005/06	375	17	–	–	–	–	–	–	–	–	392
2006/07	383	8	–	–	–	–	–	–	–	–	391
2007/08	372	8	–	–	–	–	–	–	–	–	380
2008/09	370	6	–	–	–	–	–	–	–	–	376
2009/10	374	6	–	–	–	–	–	–	–	–	380
2010/11	374	7	–	–	–	–	–	–	–	–	381
2011/12	381	6	–	–	–	–	–	–	–	–	387
2012/13	382	4	–	–	–	–	–	–	–	–	386
2013/14	389	2	–	–	–	–	–	–	–	–	391
2014/15	381	–	–	–	–	–	–	–	–	–	381
2015/16	398	–	–	–	–	–	–	–	–	–	398
2016/17	402	–	–	–	–	–	–	–	–	–	402
2017/18	388	–	–	–	–	–	–	–	–	–	388
2018/19	400	–	–	–	–	–	–	–	–	–	400
2019/20	392	–	–	–	–	–	–	–	–	–	392
2020/21	371	7	49	47	49	39	39	52	45	58	378
2021/22	348	23	56	47	43	46	39	41	53	46	371
2022/23	333	37	55	57	44	42	41	41	40	50	370
2023/24	303	65	55	53	55	44	40	40	40	41	368
2024/25	287	84	48	55	50	56	43	41	38	40	371
2025/26	264	114	45	47	55	54	57	43	40	37	378