By area · Release notes. Enrolment by planning area, local authority, school patron, county.
ST HELENS SENIOR N S
Roll number: 19762I
Limetree Ave, Portmarnock, Co. Dublin
School details
- Address
- Limetree Ave, Portmarnock, Co. Dublin (D13X326)
- Principal
- Gwyn Bhreathnach
- Ethos
- Catholic
- DEIS
- N
- Irish classification
- No subjects through Irish
- Gaeltacht
- N
- Island
- N
- Local authority
- Fingal County Council
- School patron
- Archbishop of Dublin
- School type
- Ordinary with Special Classes
- School level
- Senior
- Planning area
- Portmarnock
Preliminary data
The latest year shown (2025/26) is preliminary and subject to revision when the official enrolment figures are released by the Department of Education.
Data highlights
Key numbers to spot outliers or notable changes.
- Biggest gain in a single year: 2025/26 (preliminary): 371 in 2024/25 → 381, +10 pupils.
- Biggest loss in a single year: 2024/25: 383 in 2023/24 → 371, -12 pupils.
- Largest single-class increase: 5th Class in 2022/23 (87 → 106, +19).
- Largest single-class decrease: 4th Class in 2025/26 (preliminary) (96 → 0, -96).
- Largest cohort-step gain: 5th → 6th in 2024/25 (89 → 96, +7).
- Largest cohort-step loss: 5th → 6th in 2023/24 (106 → 101, -5).
- Overall: 357 (2020/21) → 381 (2025/26 (preliminary)), 24.
Summary statistics (class-level data)
Min / max / mean enrolment per class across the available years (2020/21–2024/25; preliminary year excluded from class stats).
| Class |
Min |
Max |
Mean |
Years |
| 3rd Class |
77 |
102 |
88.2 |
5 |
| 4th Class |
86 |
103 |
92.6 |
5 |
| 5th Class |
86 |
106 |
91.6 |
5 |
| 6th Class |
83 |
101 |
92.6 |
5 |
| Total |
357 |
383 |
372.2 |
6 |
Total enrolment over time
Enrolment by gender over time
Enrolment by class over time
Raw data by year
Years marked (preliminary) are subject to revision when official data are published.
| Year |
Female |
Male |
JI |
SI |
1st |
2nd |
3rd |
4th |
5th |
6th |
Total |
| 2020/21 |
164 |
193 |
– |
– |
– |
– |
102 |
86 |
86 |
83 |
357 |
| 2021/22 |
176 |
190 |
– |
– |
– |
– |
84 |
103 |
87 |
92 |
366 |
| 2022/23 |
187 |
188 |
– |
– |
– |
– |
86 |
88 |
106 |
91 |
375 |
| 2023/24 |
180 |
203 |
– |
– |
– |
– |
92 |
90 |
89 |
101 |
383 |
| 2024/25 |
175 |
196 |
– |
– |
– |
– |
77 |
96 |
90 |
96 |
371 |
| 2025/26 (preliminary) |
187 |
194 |
– |
– |
– |
– |
– |
– |
– |
– |
381 |