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KILL-O'-THE-GRANGE NS

Roll number: 18886V Deansgrange, Blackrock, Co. Dublin

School details

Address: Deansgrange, Blackrock, Co. Dublin (A94X225)
Email: [email protected]
Phone: 012894578
Principal: Hilary McBain
Ethos: Church Of Ireland
DEIS: N
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: Dun Laoghaire Rathdown
School patron: Archbishop of Dublin & Bishop of Glendalough COI
School type: Ordinary with Special Classes
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

25.25

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	227	9	25.22	32	3
2007/08	224	8	28.00	32	3
2008/09	211	8	26.38	32	2
2009/10	215	8	26.88	32	1
2010/11	213	8	26.62	29	0
2011/12	219	8	27.38	30	2
2012/13	219	8	27.38	30	1
2013/14	221	8	27.62	30	1
2014/15	218	8	27.25	30	2
2015/16	218	8	27.25	29	0
2016/17	215	8	26.88	29	0
2017/18	214	8	26.75	30	1
2019/20	217	8	27.12	30	1
2020/21	219	8	27.38	29	0
2021/22	212	8	26.50	30	1
2022/23	213	8	26.62	30	1
2023/24	208	8	26.00	29	0
2024/25	202	8	25.25	28	0
2025/26	202	8	25.25	28	0

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1983/84: 278 in 1982/83 → 295, +17 pupils.
Biggest loss in a single year: 1976/77: 309 in 1975/76 → 290, -19 pupils.
Largest single-class increase: 2nd Class in 2021/22 (26 → 30, +4).
Largest single-class decrease: 1st Class in 2021/22 (29 → 23, -6).
Largest cohort-step gain: 1st → 2nd in 2022/23 (23 → 26, +3).
Largest cohort-step loss: SI → 1st in 2021/22 (27 → 23, -4).
Overall: 294 (1974/75) → 208 (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	21	25	23.8	6
Senior Infants	22	27	24.5	6
1st Class	23	29	26.0	6
2nd Class	24	30	26.5	6
3rd Class	25	30	27.5	6
4th Class	26	30	27.5	6
5th Class	26	29	27.8	6
6th Class	26	29	27.7	6
Total	208	309	244.5	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 25

SI 2021/22 25

1st 2022/23 27

-2

2nd 2023/24 25

3rd 2024/25 25

4th 2025/26 26

Cohort 2021/22

JI 2021/22 25

SI 2022/23 26

1st 2023/24 27

2nd 2024/25 28

3rd 2025/26 28

Cohort 2022/23

JI 2022/23 22

SI 2023/24 22

1st 2024/25 24

2nd 2025/26 24

Cohort 2023/24

JI 2023/24 25

SI 2024/25 25

1st 2025/26 26

Cohort 2024/25

JI 2024/25 21

SI 2025/26 22

Cohort 2025/26

JI 2025/26 25

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	162	132	–	–	–	–	–	–	–	–	294
1975/76	–	–	–	–	–	–	–	–	–	–	309
1976/77	162	128	–	–	–	–	–	–	–	–	290
1977/78	162	132	–	–	–	–	–	–	–	–	294
1978/79	–	–	–	–	–	–	–	–	–	–	278
1979/80	161	122	–	–	–	–	–	–	–	–	283
1980/81	149	128	–	–	–	–	–	–	–	–	277
1981/82	141	123	–	–	–	–	–	–	–	–	264
1982/83	148	130	–	–	–	–	–	–	–	–	278
1983/84	154	141	–	–	–	–	–	–	–	–	295
1993/94	142	141	–	–	–	–	–	–	–	–	283
1994/95	134	139	–	–	–	–	–	–	–	–	273
1995/96	129	137	–	–	–	–	–	–	–	–	266
1996/97	134	138	–	–	–	–	–	–	–	–	272
1997/98	130	138	–	–	–	–	–	–	–	–	268
1998/99	136	131	–	–	–	–	–	–	–	–	267
1999/00	127	127	–	–	–	–	–	–	–	–	254
2000/01	112	131	–	–	–	–	–	–	–	–	243
2001/02	113	134	–	–	–	–	–	–	–	–	247
2002/03	118	122	–	–	–	–	–	–	–	–	240
2003/04	119	122	–	–	–	–	–	–	–	–	241
2004/05	113	127	–	–	–	–	–	–	–	–	240
2005/06	117	123	–	–	–	–	–	–	–	–	240
2006/07	109	118	–	–	–	–	–	–	–	–	227
2007/08	111	113	–	–	–	–	–	–	–	–	224
2008/09	104	107	–	–	–	–	–	–	–	–	211
2009/10	107	108	–	–	–	–	–	–	–	–	215
2010/11	100	113	–	–	–	–	–	–	–	–	213
2011/12	100	119	–	–	–	–	–	–	–	–	219
2012/13	110	109	–	–	–	–	–	–	–	–	219
2013/14	107	114	–	–	–	–	–	–	–	–	221
2014/15	99	119	–	–	–	–	–	–	–	–	218
2015/16	100	118	–	–	–	–	–	–	–	–	218
2016/17	98	117	–	–	–	–	–	–	–	–	215
2017/18	99	115	–	–	–	–	–	–	–	–	214
2018/19	103	110	–	–	–	–	–	–	–	–	213
2019/20	102	115	–	–	–	–	–	–	–	–	217
2020/21	107	112	25	27	29	26	29	28	28	27	219
2021/22	106	106	25	25	23	30	26	28	26	29	212
2022/23	108	105	22	26	27	26	30	27	29	26	213
2023/24	113	101	25	22	27	25	27	30	27	28	214
2024/25	112	96	21	25	24	28	25	26	29	27	208
2025/26	110	98	25	22	26	24	28	26	28	29	208