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
24.85
2025/26
Mainstream classes
33
2025/26
Largest class group
29
2025/26
Classes with 30+ pupils
0
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
881
31
28.42
31
9
2007/08
883
33
26.76
30
3
2008/09
886
34
26.06
29
0
2009/10
883
34
25.97
29
0
2010/11
891
34
26.21
30
1
2011/12
898
33
27.21
30
4
2012/13
909
33
27.55
30
7
2013/14
905
33
27.42
31
6
2014/15
905
33
27.42
30
3
2015/16
912
33
27.64
30
2
2016/17
908
33
27.52
30
4
2017/18
911
33
27.61
30
6
2019/20
898
32
28.06
30
1
2020/21
899
32
28.09
31
4
2021/22
903
33
27.36
29
0
2022/23
892
33
27.03
31
4
2023/24
850
33
25.76
31
3
2024/25
851
33
25.79
29
0
2025/26
820
33
24.85
29
0
Data highlights
Key numbers to spot outliers or notable changes.
Biggest gain in a single year: 1975/76: 258 in 1974/75 → 414, +156 pupils.
Biggest loss in a single year: 2023/24: 911 in 2022/23 → 869, -42 pupils.
Largest single-class increase: Junior Infants in 2024/25 (95 → 117, +22).
Largest single-class decrease: Junior Infants in 2025/26 (117 → 90, -27).
Largest cohort-step gain: 4th → 5th in 2022/23 (118 → 124, +6).
Largest cohort-step loss: 2nd → 3rd in 2023/24 (112 → 104, -8).
Overall: 258 (1974/75) → 838 (2025/26), 580.
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
90
117
104.0
6
Senior Infants
98
118
107.2
6
1st Class
99
115
107.3
6
2nd Class
101
116
109.3
6
3rd Class
104
117
109.8
6
4th Class
100
118
111.0
6
5th Class
105
124
115.0
6
6th Class
112
123
116.5
6
Total
258
929
827.2
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
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).