By area · Release notes. Enrolment by planning area, local authority, school patron, county.
ST THOMAS SENIOR N S
Roll number: 19765O
Jobstown, Tallaght, Dublin 24
School details
- Address
- Jobstown, Tallaght, Dublin 24 (D24YN90)
- Principal
- Eithne O'Shea
- Ethos
- Catholic
- DEIS
- Y
- 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
- Senior
- Planning area
- Tallaght
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: 2022/23: 345 in 2021/22 → 363, +18 pupils.
- Biggest loss in a single year: 2021/22: 376 in 2020/21 → 345, -31 pupils.
- Largest single-class increase: 5th Class in 2023/24 (76 → 98, +22).
- Largest single-class decrease: 5th Class in 2025/26 (preliminary) (97 → 0, -97).
- Largest cohort-step gain: 5th → 6th in 2023/24 (76 → 80, +4).
- Largest cohort-step loss: 5th → 6th in 2021/22 (91 → 84, -7).
- Overall: 376 (2020/21) → 331 (2025/26 (preliminary)), -45.
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 |
75 |
102 |
88.6 |
5 |
| 4th Class |
78 |
99 |
90.6 |
5 |
| 5th Class |
76 |
98 |
90.0 |
5 |
| 6th Class |
80 |
109 |
91.8 |
5 |
| Total |
331 |
376 |
356.0 |
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 |
176 |
200 |
– |
– |
– |
– |
84 |
92 |
91 |
109 |
376 |
| 2021/22 |
163 |
182 |
– |
– |
– |
– |
95 |
78 |
88 |
84 |
345 |
| 2022/23 |
174 |
189 |
– |
– |
– |
– |
102 |
96 |
76 |
89 |
363 |
| 2023/24 |
177 |
187 |
– |
– |
– |
– |
87 |
99 |
98 |
80 |
364 |
| 2024/25 |
186 |
171 |
– |
– |
– |
– |
75 |
88 |
97 |
97 |
357 |
| 2025/26 (preliminary) |
168 |
163 |
– |
– |
– |
– |
– |
– |
– |
– |
331 |