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ST MARYS N S

Roll number: 19817H Airlie Heights, Lucan, Co. Dublin

School details

Address: Airlie Heights, Lucan, Co. Dublin (K78KP94)
Email: [email protected]
Phone: 016240203
Principal: John Egan
Ethos: Catholic
DEIS: N
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: South Dublin County Council
School patron: Archbishop of Dublin
School type: Ordinary with Special Classes
School level: All-Through School
Planning area: Lucan

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

24.84

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	354	13	27.23	32	3
2007/08	371	14	26.50	30	1
2008/09	374	14	26.71	31	2
2009/10	379	15	25.27	30	1
2010/11	413	16	25.81	29	0
2011/12	400	16	25.00	29	0
2012/13	413	16	25.81	30	1
2013/14	415	16	25.94	30	1
2014/15	414	16	25.88	29	0
2015/16	419	15	27.93	31	2
2016/17	410	16	25.62	31	2
2017/18	447	17	26.29	29	0
2019/20	469	18	26.06	30	3
2020/21	480	18	26.67	30	1
2021/22	473	18	26.28	29	0
2022/23	458	18	25.44	29	0
2023/24	484	19	25.47	28	0
2024/25	483	19	25.42	28	0
2025/26	472	19	24.84	28	0

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 2017/18: 415 in 2016/17 → 453, +38 pupils.
Biggest loss in a single year: 1998/99: 288 in 1997/98 → 268, -20 pupils.
Largest single-class increase: Junior Infants in 2023/24 (52 → 75, +23).
Largest single-class decrease: Senior Infants in 2025/26 (75 → 51, -24).
Largest cohort-step gain: 2nd → 3rd in 2025/26 (51 → 55, +4).
Largest cohort-step loss: SI → 1st in 2022/23 (69 → 66, -3).
Overall: 326 (1993/94) → 483 (2025/26), 157.

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	52	75	61.3	6
Senior Infants	51	75	59.5	6
1st Class	52	72	59.5	6
2nd Class	51	74	59.2	6
3rd Class	53	74	60.0	6
4th Class	53	74	60.5	6
5th Class	53	73	58.5	6
6th Class	54	72	58.3	6
Total	268	496	378.4	33

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 68

SI 2021/22 69

-3

1st 2022/23 66

2nd 2023/24 67

3rd 2024/25 70

4th 2025/26 72

Cohort 2021/22

JI 2021/22 53

-2

SI 2022/23 51

1st 2023/24 52

-1

2nd 2024/25 51

3rd 2025/26 55

Cohort 2022/23

JI 2022/23 52

SI 2023/24 53

1st 2024/25 54

2nd 2025/26 54

Cohort 2023/24

JI 2023/24 75

SI 2024/25 75

-3

1st 2025/26 72

Cohort 2024/25

JI 2024/25 52

-1

SI 2025/26 51

Cohort 2025/26

JI 2025/26 68

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1993/94	152	174	–	–	–	–	–	–	–	–	326
1994/95	145	164	–	–	–	–	–	–	–	–	309
1995/96	144	157	–	–	–	–	–	–	–	–	301
1996/97	147	142	–	–	–	–	–	–	–	–	289
1997/98	147	141	–	–	–	–	–	–	–	–	288
1998/99	128	140	–	–	–	–	–	–	–	–	268
1999/00	132	145	–	–	–	–	–	–	–	–	277
2000/01	126	148	–	–	–	–	–	–	–	–	274
2001/02	131	146	–	–	–	–	–	–	–	–	277
2002/03	122	147	–	–	–	–	–	–	–	–	269
2003/04	123	157	–	–	–	–	–	–	–	–	280
2004/05	134	162	–	–	–	–	–	–	–	–	296
2005/06	149	176	–	–	–	–	–	–	–	–	325
2006/07	164	190	–	–	–	–	–	–	–	–	354
2007/08	174	197	–	–	–	–	–	–	–	–	371
2008/09	179	195	–	–	–	–	–	–	–	–	374
2009/10	182	197	–	–	–	–	–	–	–	–	379
2010/11	199	214	–	–	–	–	–	–	–	–	413
2011/12	185	215	–	–	–	–	–	–	–	–	400
2012/13	192	221	–	–	–	–	–	–	–	–	413
2013/14	196	219	–	–	–	–	–	–	–	–	415
2014/15	202	212	–	–	–	–	–	–	–	–	414
2015/16	209	214	–	–	–	–	–	–	–	–	423
2016/17	207	208	–	–	–	–	–	–	–	–	415
2017/18	218	235	–	–	–	–	–	–	–	–	453
2018/19	240	242	–	–	–	–	–	–	–	–	482
2019/20	244	237	–	–	–	–	–	–	–	–	481
2020/21	238	254	68	58	57	74	54	55	59	55	492
2021/22	229	256	53	69	56	55	74	53	55	58	485
2022/23	220	250	52	51	66	54	53	74	53	55	470
2023/24	224	272	75	53	52	67	54	56	73	54	496
2024/25	223	272	52	75	54	51	70	53	56	72	495
2025/26	219	264	68	51	72	54	55	72	55	56	483