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
24.29
2025/26
Mainstream classes
24
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
492
18
27.33
33
5
2007/08
483
18
26.83
30
3
2008/09
480
18
26.67
32
5
2009/10
459
17
27.00
30
3
2010/11
475
17
27.94
35
5
2011/12
472
17
27.76
32
5
2012/13
499
18
27.72
31
3
2013/14
524
19
27.58
31
5
2014/15
515
19
27.11
32
4
2015/16
545
19
28.68
32
9
2016/17
543
20
27.15
32
7
2017/18
572
21
27.24
32
4
2019/20
596
22
27.09
32
5
2020/21
596
23
25.91
29
0
2021/22
595
23
25.87
29
0
2022/23
594
23
25.83
29
0
2023/24
581
23
25.26
29
0
2024/25
588
24
24.50
28
0
2025/26
583
24
24.29
29
0
Data highlights
Key numbers to spot outliers or notable changes.
Biggest gain in a single year: 1993/94: 276 in 1983/84 → 386, +110 pupils.
Biggest loss in a single year: 1977/78: 300 in 1976/77 → 258, -42 pupils.
Largest single-class increase: 5th Class in 2021/22 (51 → 80, +29).
Largest single-class decrease: 5th Class in 2022/23 (80 → 56, -24).
Largest cohort-step gain: SI → 1st in 2025/26 (74 → 78, +4).
Largest cohort-step loss: 2nd → 3rd in 2025/26 (79 → 59, -20).
Overall: 349 (1974/75) → 583 (2025/26), 234.
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
77
85
81.0
6
Senior Infants
74
86
81.3
6
1st Class
78
84
81.0
6
2nd Class
77
84
79.8
6
3rd Class
59
73
66.7
6
4th Class
64
80
69.3
6
5th Class
51
80
65.8
6
6th Class
53
74
64.5
6
Total
234
596
450.5
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
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).