St Thomas Senior N S
Dublin 24 · Roll number 19765O
- Catholic ethos
- DEIS
- Ordinary with Special Classes
- Pupils in 2025/26
- 331
- −26 on 2024/25
- Over 10 years
- −25%
- Down 111 from 442 in 2015/16
- Girls and boys
- 168 / 163
- 51% girls
Pupils since 1993
Total enrolment each school year
Shaded: the last 10 years, 2015/16 to 2025/26.
Pupils by class
Published for each class from 2020/21.
This year, 2025/26
331 pupils across 8 classes
Every class, every year
Darker cells have more pupils. A group of pupils moves down one class and right one year.
| 2020/21 | 2021/22 | 2022/23 | 2023/24 | 2024/25 | 2025/26 | Average | |
|---|---|---|---|---|---|---|---|
| Junior Infants | – | – | – | – | – | 0 | 0.0 |
| Senior Infants | – | – | – | – | – | 0 | 0.0 |
| 1st Class | – | – | – | – | – | 0 | 0.0 |
| 2nd Class | – | – | – | – | – | 0 | 0.0 |
| 3rd Class | 84 | 95 | 102 | 87 | 75 | 80 | 87.2 |
| 4th Class | 92 | 78 | 96 | 99 | 88 | 72 | 87.5 |
| 5th Class | 91 | 88 | 76 | 98 | 97 | 82 | 88.7 |
| 6th Class | 109 | 84 | 89 | 80 | 97 | 97 | 92.7 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2020/21
75 in 3rd Class (2024/25), 72 in 4th Class (2025/26): 3 pupils fewer.
- 753rd Class2024/25
- 724th Class2025/26
In 3rd Class in 2023/24
87 in 3rd Class (2023/24), 82 in 5th Class (2025/26): 5 pupils fewer.
- 873rd Class2023/24
- 884th Class2024/25
- 825th Class2025/26
In 3rd Class in 2022/23
102 in 3rd Class (2022/23), 97 in 6th Class (2025/26): 5 pupils fewer.
- 1023rd Class2022/23
- 994th Class2023/24
- 975th Class2024/25
- 976th Class2025/26
In 3rd Class in 2021/22
95 in 3rd Class (2021/22), 97 in 6th Class (2024/25): 2 pupils more.
- 953rd Class2021/22
- 964th Class2022/23
- 985th Class2023/24
- 976th Class2024/25
In 3rd Class in 2020/21
84 in 3rd Class (2020/21), 80 in 6th Class (2023/24): 4 pupils fewer.
- 843rd Class2020/21
- 784th Class2021/22
- 765th Class2022/23
- 806th Class2023/24
In 4th Class in 2020/21
92 in 4th Class (2020/21), 89 in 6th Class (2022/23): 3 pupils fewer.
- 924th Class2020/21
- 885th Class2021/22
- 896th Class2022/23
In 5th Class in 2020/21
91 in 5th Class (2020/21), 84 in 6th Class (2021/22): 7 pupils fewer.
- 915th Class2020/21
- 846th Class2021/22
Biggest one-year changes in a class
- +225th Class in 2023/24 (76 to 98)
- −256th Class in 2021/22 (109 to 84)
Class sizes
Mainstream class groups, 2006/07 to 2025/26.
Why these won't match pupils by class
Mainstream class groups only. The source does not identify which standard/year group each class group belongs to. So these figures won't match the pupils-by-class figures exactly.
In 2025/26. Choose a figure to chart it.
Class sizes over time
Average class size, 2006/07 to 2025/26
Teachers
Who teaches at St Thomas Senior N S, 2006/07 to 2025/26.
How we count teachers
Class teachers come from the Department of Education's class sizes: one for each mainstream class. Special education and special class teachers are the posts the National Council for Special Education (NCSE) allocates. We add a principal who doesn't teach a class where the Department's rules give the school one. These are posts, not people: part of a post can be a teacher shared with another school. Up to 2015/16 the Department counted every teacher itself. Known data issues
In 2025/26
34.1teaching posts
Our estimate: about 34 teachers.
- Class teachersOne for each of the 17 mainstream classes 17
- PrincipalRuns the school and doesn't teach a class 1
- Special education teachers352.5 hours of support teaching a week 14.1
- Special class teachersFor a mild general learning disability class and a specific learning disability class 2
11.5 special needs assistants (SNAs) also work with pupils. 19 pupils are in special classes, which the class sizes leave out.
The NCSE has allocated 13.9 special education teachers, 2 special class teachers and 11.5 SNAs for next year.
Teachers since 2006/07
Teachers each school year, by role
To 2015/16: the Department of Education's count of every teacher. From 2019/20: our estimate, from class sizes and the NCSE's allocations. Dashed boxes: no special education figures were published for those years, so only class teachers and the principal are shown. Known data issues
Sources: Department of Education class sizes and teacher counts; NCSE school allocations and special classes (CC BY 4.0).
Nearby schools
The 6 primary schools closest to St Thomas Senior N S, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| St Thomas Senior N SThis school | – | 331 |
−25.1%
|
|
| 1 | St Thomas Junior N S0.1 km · Dublin 24 · DEIS | 0.1 km | 300 |
−27.5%
|
| 2 | Scoil Chaitlin Maude0.6 km · Baile Átha Cliath 24 · Gaelscoil · Multi-denominational · DEIS | 0.6 km | 284 |
−9.3%
|
| 3 | Scoil Cnoc Mhuire Junior0.7 km · Dublin 24 · DEIS | 0.7 km | 141 |
−23.4%
|
| 4 | Scoil Cnoc Mhuire Sin0.8 km · Dublin 24 · DEIS | 0.8 km | 145 |
−1.4%
|
| 5 | St Aidans NS0.8 km · Dublin 24 · DEIS | 0.8 km | 244 |
−22.8%
|
| 6 | Tallaght Community National School0.8 km · Dublin 24 · Multi-denominational · DEIS | 0.8 km | 151 |
+57.3%
|
About this school
Inspection reports open on gov.ie, under the name the school had when it was inspected. They describe specific areas of the school's work rather than giving an overall grade. Newer schools may not have one yet.
Contact
- Principal
- John Rennick
- Phone
- 014526555
- [email protected]
- Address
- Jobstown, Tallaght, Dublin 24, D24 YN90
School
- Ethos
- Catholic
- Patron
- Archbishop of Dublin
- School type
- Ordinary with Special Classes
- School level
- Senior
- DEIS
- DEIS
Language and area
- Irish classification
- No subjects through Irish
- Gaeltacht
- Non-Gaeltacht
- Island
- Not on an island
- Local authority
- South Dublin County Council
- Planning area
- Tallaght
Each detail is the latest one the Department of Education has recorded for this school. If a detail was left blank in 2025/26, we show it from an earlier year, so some details may be older than the pupil numbers. Known data issues
Data by year
34 school years from 1983/84 to 2025/26. Class figures start in 2020/21.
| Year | Total | Girls | Boys | JI | SI | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | 331 | 168 | 163 | 0 | 0 | 0 | 0 | 80 | 72 | 82 | 97 |
| 2024/25 | 357 | 186 | 171 | – | – | – | – | 75 | 88 | 97 | 97 |
| 2023/24 | 364 | 177 | 187 | – | – | – | – | 87 | 99 | 98 | 80 |
| 2022/23 | 363 | 174 | 189 | – | – | – | – | 102 | 96 | 76 | 89 |
| 2021/22 | 345 | 163 | 182 | – | – | – | – | 95 | 78 | 88 | 84 |
| 2020/21 | 376 | 176 | 200 | – | – | – | – | 84 | 92 | 91 | 109 |
| 2019/20 | 399 | 192 | 207 | – | – | – | – | – | – | – | – |
| 2018/19 | 423 | 211 | 212 | – | – | – | – | – | – | – | – |
| 2017/18 | 428 | 215 | 213 | – | – | – | – | – | – | – | – |
| 2016/17 | 432 | 201 | 231 | – | – | – | – | – | – | – | – |
| 2015/16 | 442 | 210 | 232 | – | – | – | – | – | – | – | – |
| 2014/15 | 446 | 205 | 241 | – | – | – | – | – | – | – | – |
| 2013/14 | 456 | 208 | 248 | – | – | – | – | – | – | – | – |
| 2012/13 | 461 | 225 | 236 | – | – | – | – | – | – | – | – |
| 2011/12 | 452 | 210 | 242 | – | – | – | – | – | – | – | – |
| 2010/11 | 426 | 205 | 221 | – | – | – | – | – | – | – | – |
| 2009/10 | 405 | 176 | 229 | – | – | – | – | – | – | – | – |
| 2008/09 | 390 | 169 | 221 | – | – | – | – | – | – | – | – |
| 2007/08 | 391 | 183 | 208 | – | – | – | – | – | – | – | – |
| 2006/07 | 384 | 178 | 206 | – | – | – | – | – | – | – | – |
| 2005/06 | 369 | 179 | 190 | – | – | – | – | – | – | – | – |
| 2004/05 | 364 | 181 | 183 | – | – | – | – | – | – | – | – |
| 2003/04 | 374 | 176 | 198 | – | – | – | – | – | – | – | – |
| 2002/03 | 400 | 202 | 198 | – | – | – | – | – | – | – | – |
| 2001/02 | 408 | 206 | 202 | – | – | – | – | – | – | – | – |
| 2000/01 | 429 | 213 | 216 | – | – | – | – | – | – | – | – |
| 1999/00 | 456 | 222 | 234 | – | – | – | – | – | – | – | – |
| 1998/99 | 512 | 226 | 286 | – | – | – | – | – | – | – | – |
| 1997/98 | 544 | 233 | 311 | – | – | – | – | – | – | – | – |
| 1996/97 | 588 | 268 | 320 | – | – | – | – | – | – | – | – |
| 1995/96 | 590 | 276 | 314 | – | – | – | – | – | – | – | – |
| 1994/95 | 614 | 277 | 337 | – | – | – | – | – | – | – | – |
| 1993/94 | 631 | 327 | 304 | – | – | – | – | – | – | – | – |
| 1983/84 | 384 | 193 | 191 | – | – | – | – | – | – | – | – |