Holy Trinity Sen N S
Dublin 13 · Roll number 19406J
- Catholic ethos
- Not DEIS
- Ordinary with Special Classes
- Pupils in 2025/26
- 397
- −4 on 2024/25
- Over 10 years
- +14%
- Up 50 from 347 in 2015/16
- Girls and boys
- 199 / 198
- 50% girls
Pupils since 1974
Total enrolment each school year
Shaded: the last 10 years, 2015/16 to 2025/26. 1983/84 is left out because its source file is incomplete, and no files exist for 1984/85 to 1992/93. Known data issues
Pupils by class
Published for each class from 2020/21.
This year, 2025/26
397 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 | 103 | 103 | 92 | 92 | 95 | 99 | 97.3 |
| 4th Class | 106 | 101 | 102 | 96 | 95 | 100 | 100.0 |
| 5th Class | 85 | 101 | 100 | 101 | 98 | 95 | 96.7 |
| 6th Class | 88 | 84 | 102 | 101 | 103 | 103 | 96.8 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2020/21
95 in 3rd Class (2024/25), 100 in 4th Class (2025/26): 5 pupils more.
- 953rd Class2024/25
- 1004th Class2025/26
In 3rd Class in 2023/24
92 in 3rd Class (2023/24), 95 in 5th Class (2025/26): 3 pupils more.
- 923rd Class2023/24
- 954th Class2024/25
- 955th Class2025/26
In 3rd Class in 2022/23
92 in 3rd Class (2022/23), 103 in 6th Class (2025/26): 11 pupils more.
- 923rd Class2022/23
- 964th Class2023/24
- 985th Class2024/25
- 1036th Class2025/26
In 3rd Class in 2021/22
103 in 3rd Class (2021/22), 103 in 6th Class (2024/25): no change.
- 1033rd Class2021/22
- 1024th Class2022/23
- 1015th Class2023/24
- 1036th Class2024/25
In 3rd Class in 2020/21
103 in 3rd Class (2020/21), 101 in 6th Class (2023/24): 2 pupils fewer.
- 1033rd Class2020/21
- 1014th Class2021/22
- 1005th Class2022/23
- 1016th Class2023/24
In 4th Class in 2020/21
106 in 4th Class (2020/21), 102 in 6th Class (2022/23): 4 pupils fewer.
- 1064th Class2020/21
- 1015th Class2021/22
- 1026th Class2022/23
In 5th Class in 2020/21
85 in 5th Class (2020/21), 84 in 6th Class (2021/22): 1 pupil fewer.
- 855th Class2020/21
- 846th Class2021/22
Biggest one-year changes in a class
- +186th Class in 2022/23 (84 to 102)
- −113rd Class in 2022/23 (103 to 92)
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 Holy Trinity Sen 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
26.5teaching posts
Our estimate: about 26 teachers.
- Class teachersOne for each of the 16 mainstream classes 16
- PrincipalRuns the school and doesn't teach a class 1
- Special education teachers187.5 hours of support teaching a week 7.5
- Special class teachersFor 2 autism classes 2
11 special needs assistants (SNAs) also work with pupils. 12 pupils are in special classes, which the class sizes leave out.
The NCSE has allocated 7.5 special education teachers, 2 special class teachers and 11 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 Holy Trinity Sen N S, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| Holy Trinity Sen N SThis school | – | 397 |
+14.4%
|
|
| 1 | Scoil Bhride0.1 km · Dublin 13 | 0.1 km | 365 |
−3.9%
|
| 2 | Scoil Naomh Colmcille0.1 km · Dublin 13 | 0.1 km | 217 |
+77.9%
|
| 3 | St Kevins Junior N S0.2 km · Dublin 13 | 0.2 km | 149 |
−8.0%
|
| 4 | Gaelscoil Ghráinne Mhaol0.5 km · Dublin 13 · Gaelscoil · Multi-denominational | 0.5 km | 84 | – |
| 5 | Stapolin Educate Together National School0.9 km · Dublin 13 · Multi-denominational | 0.9 km | 340 | – |
| 6 | St Benedicts and St Marys National School0.9 km · Dublin 5 · Some subjects through Irish · DEIS | 0.9 km | 165 |
+24.1%
|
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
- David Henry
- Phone
- 018474695
- [email protected]
- Address
- Grange Road, Donaghmede, Dublin 13, D13 WY00
School
- Ethos
- Catholic
- Patron
- Archbishop of Dublin
- School type
- Ordinary with Special Classes
- School level
- Senior
- DEIS
- Not DEIS
Language and area
- Irish classification
- No subjects through Irish
- Gaeltacht
- Non-Gaeltacht
- Island
- Not on an island
- Local authority
- Dublin City Council
- Planning area
- Donaghmede–Howth–D13
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
42 school years from 1974/75 to 2025/26. Class figures start in 2020/21.
| Year | Total | Girls | Boys | JI | SI | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | 397 | 199 | 198 | 0 | 0 | 0 | 0 | 99 | 100 | 95 | 103 |
| 2024/25 | 401 | 202 | 199 | – | – | – | – | 95 | 95 | 98 | 103 |
| 2023/24 | 401 | 213 | 188 | – | – | – | – | 92 | 96 | 101 | 101 |
| 2022/23 | 408 | 203 | 205 | – | – | – | – | 92 | 102 | 100 | 102 |
| 2021/22 | 401 | 200 | 201 | – | – | – | – | 103 | 101 | 101 | 84 |
| 2020/21 | 394 | 195 | 199 | – | – | – | – | 103 | 106 | 85 | 88 |
| 2019/20 | 381 | 178 | 203 | – | – | – | – | – | – | – | – |
| 2018/19 | 356 | 168 | 188 | – | – | – | – | – | – | – | – |
| 2017/18 | 366 | 179 | 187 | – | – | – | – | – | – | – | – |
| 2016/17 | 354 | 165 | 189 | – | – | – | – | – | – | – | – |
| 2015/16 | 347 | 168 | 179 | – | – | – | – | – | – | – | – |
| 2014/15 | 330 | 161 | 169 | – | – | – | – | – | – | – | – |
| 2013/14 | 328 | 149 | 179 | – | – | – | – | – | – | – | – |
| 2012/13 | 339 | 155 | 184 | – | – | – | – | – | – | – | – |
| 2011/12 | 345 | 157 | 188 | – | – | – | – | – | – | – | – |
| 2010/11 | 353 | 159 | 194 | – | – | – | – | – | – | – | – |
| 2009/10 | 328 | 153 | 175 | – | – | – | – | – | – | – | – |
| 2008/09 | 287 | 129 | 158 | – | – | – | – | – | – | – | – |
| 2007/08 | 260 | 115 | 145 | – | – | – | – | – | – | – | – |
| 2006/07 | 248 | 112 | 136 | – | – | – | – | – | – | – | – |
| 2005/06 | 229 | 96 | 133 | – | – | – | – | – | – | – | – |
| 2004/05 | 277 | 126 | 151 | – | – | – | – | – | – | – | – |
| 2003/04 | 267 | 130 | 137 | – | – | – | – | – | – | – | – |
| 2002/03 | 272 | 127 | 145 | – | – | – | – | – | – | – | – |
| 2001/02 | 273 | 135 | 138 | – | – | – | – | – | – | – | – |
| 2000/01 | 261 | 135 | 126 | – | – | – | – | – | – | – | – |
| 1999/00 | 272 | 136 | 136 | – | – | – | – | – | – | – | – |
| 1998/99 | 279 | 128 | 151 | – | – | – | – | – | – | – | – |
| 1997/98 | 291 | 131 | 160 | – | – | – | – | – | – | – | – |
| 1996/97 | 306 | 136 | 170 | – | – | – | – | – | – | – | – |
| 1995/96 | 278 | 115 | 163 | – | – | – | – | – | – | – | – |
| 1994/95 | 315 | 146 | 169 | – | – | – | – | – | – | – | – |
| 1993/94 | 358 | 158 | 200 | – | – | – | – | – | – | – | – |
| 1982/83 | 517 | 261 | 256 | – | – | – | – | – | – | – | – |
| 1981/82 | 516 | 271 | 245 | – | – | – | – | – | – | – | – |
| 1980/81 | 587 | 294 | 293 | – | – | – | – | – | – | – | – |
| 1979/80 | 626 | 322 | 304 | – | – | – | – | – | – | – | – |
| 1978/79 | 661 | 332 | 329 | – | – | – | – | – | – | – | – |
| 1977/78 | 650 | 314 | 336 | – | – | – | – | – | – | – | – |
| 1976/77 | 677 | 325 | 352 | – | – | – | – | – | – | – | – |
| 1975/76 | 687 | – | – | – | – | – | – | – | – | – | – |
| 1974/75 | 727 | 337 | 390 | – | – | – | – | – | – | – | – |