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S N MUIRE GAN SMAL

Roll number: 18052S Sentry Hill, Letterkenny, Co. Donegal

School details

Address: Sentry Hill, Letterkenny, Co. Donegal (F92CK27)
Email: [email protected]
Phone: 0749121171
Principal: Irene Simmons
Ethos: Catholic
DEIS: N
Irish classification: No subjects through Irish
Gaeltacht: N
Island: N
Local authority: Donegal County Council
School patron: Bishop of Raphoe
School type: Ordinary
School level: All-Through School
Planning area: Letterkenny

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

24.95

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	540	20	27.00	30	1
2007/08	534	21	25.43	29	0
2008/09	527	21	25.10	30	1
2009/10	516	21	24.57	29	0
2010/11	500	21	23.81	28	0
2011/12	527	20	26.35	31	5
2012/13	477	19	25.11	31	4
2013/14	470	17	27.65	32	4
2014/15	454	17	26.71	31	4
2015/16	444	16	27.75	35	6
2016/17	412	16	25.75	31	3
2017/18	427	16	26.69	31	5
2019/20	432	17	25.41	30	1
2020/21	423	16	26.44	31	4
2021/22	419	16	26.19	30	2
2022/23	446	18	24.78	30	5
2023/24	470	19	24.74	30	7
2024/25	479	19	25.21	30	10
2025/26	474	19	24.95	30	10

Data highlights

Key numbers to spot outliers or notable changes.

Biggest gain in a single year: 1993/94: 650 in 1982/83 → 702, +52 pupils.
Biggest loss in a single year: 1975/76: 644 in 1974/75 → 572, -72 pupils.
Largest single-class increase: 4th Class in 2022/23 (39 → 56, +17).
Largest single-class decrease: 2nd Class in 2021/22 (60 → 51, -9).
Largest cohort-step gain: 4th → 5th in 2022/23 (39 → 48, +9).
Largest cohort-step loss: 1st → 2nd in 2021/22 (57 → 51, -6).
Overall: 644 (1974/75) → 480 (2025/26), -164.

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	55	60	59.0	6
Senior Infants	56	61	59.5	6
1st Class	57	60	59.0	6
2nd Class	51	60	58.5	6
3rd Class	41	60	55.3	6
4th Class	39	60	52.8	6
5th Class	46	60	54.3	6
6th Class	48	60	54.3	6
Total	412	702	557.5	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 55

SI 2021/22 56

1st 2022/23 60

2nd 2023/24 60

3rd 2024/25 60

4th 2025/26 60

Cohort 2021/22

JI 2021/22 60

SI 2022/23 60

1st 2023/24 60

2nd 2024/25 60

3rd 2025/26 60

Cohort 2022/23

JI 2022/23 60

SI 2023/24 60

1st 2024/25 60

2nd 2025/26 60

Cohort 2023/24

JI 2023/24 60

SI 2024/25 60

1st 2025/26 60

Cohort 2024/25

JI 2024/25 59

SI 2025/26 60

Cohort 2025/26

JI 2025/26 60

Raw data by year

Year	Female	Male	JI	SI	1st	2nd	3rd	4th	5th	6th	Total
1974/75	519	125	–	–	–	–	–	–	–	–	644
1975/76	–	–	–	–	–	–	–	–	–	–	572
1976/77	622	–	–	–	–	–	–	–	–	–	622
1977/78	–	–	–	–	–	–	–	–	–	–	641
1978/79	641	–	–	–	–	–	–	–	–	–	641
1979/80	661	–	–	–	–	–	–	–	–	–	661
1980/81	656	–	–	–	–	–	–	–	–	–	656
1981/82	664	–	–	–	–	–	–	–	–	–	664
1982/83	650	–	–	–	–	–	–	–	–	–	650
1993/94	702	–	–	–	–	–	–	–	–	–	702
1994/95	663	–	–	–	–	–	–	–	–	–	663
1995/96	660	–	–	–	–	–	–	–	–	–	660
1996/97	636	–	–	–	–	–	–	–	–	–	636
1997/98	634	–	–	–	–	–	–	–	–	–	634
1998/99	609	–	–	–	–	–	–	–	–	–	609
1999/00	602	–	–	–	–	–	–	–	–	–	602
2000/01	595	–	–	–	–	–	–	–	–	–	595
2001/02	581	–	–	–	–	–	–	–	–	–	581
2002/03	588	–	–	–	–	–	–	–	–	–	588
2003/04	582	–	–	–	–	–	–	–	–	–	582
2004/05	587	–	–	–	–	–	–	–	–	–	587
2005/06	569	–	–	–	–	–	–	–	–	–	569
2006/07	583	–	–	–	–	–	–	–	–	–	583
2007/08	579	–	–	–	–	–	–	–	–	–	579
2008/09	574	–	–	–	–	–	–	–	–	–	574
2009/10	571	–	–	–	–	–	–	–	–	–	571
2010/11	551	–	–	–	–	–	–	–	–	–	551
2011/12	527	–	–	–	–	–	–	–	–	–	527
2012/13	477	–	–	–	–	–	–	–	–	–	477
2013/14	470	–	–	–	–	–	–	–	–	–	470
2014/15	454	–	–	–	–	–	–	–	–	–	454
2015/16	444	–	–	–	–	–	–	–	–	–	444
2016/17	412	–	–	–	–	–	–	–	–	–	412
2017/18	427	–	–	–	–	–	–	–	–	–	427
2018/19	423	16	–	–	–	–	–	–	–	–	439
2019/20	393	39	–	–	–	–	–	–	–	–	432
2020/21	358	65	55	61	57	60	41	42	53	54	423
2021/22	335	84	60	56	57	51	57	39	46	53	419
2022/23	330	116	60	60	60	60	54	56	48	48	446
2023/24	320	150	60	60	60	60	60	60	59	51	470
2024/25	304	175	59	60	60	60	60	60	60	60	479
2025/26	284	196	60	60	60	60	60	60	60	60	480