St Marys Sen N S
Dublin 22 · Roll number 19647I
- Catholic ethos
- DEIS
- Ordinary with Special Classes
- Pupils in 2025/26
- 204
- +12 on 2024/25
- Over 10 years
- −11%
- Down 26 from 230 in 2015/16
- Girls and boys
- 96 / 108
- 47% girls
Pupils since 1979
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
204 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 | 52 | 66 | 41 | 51 | 26 | 64 | 50.0 |
| 4th Class | 44 | 54 | 66 | 37 | 49 | 33 | 47.2 |
| 5th Class | 54 | 47 | 56 | 65 | 36 | 63 | 53.5 |
| 6th Class | 51 | 57 | 48 | 52 | 59 | 44 | 51.8 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2020/21
26 in 3rd Class (2024/25), 33 in 4th Class (2025/26): 7 pupils more.
- 263rd Class2024/25
- 334th Class2025/26
In 3rd Class in 2023/24
51 in 3rd Class (2023/24), 63 in 5th Class (2025/26): 12 pupils more.
- 513rd Class2023/24
- 494th Class2024/25
- 635th Class2025/26
In 3rd Class in 2022/23
41 in 3rd Class (2022/23), 44 in 6th Class (2025/26): 3 pupils more.
- 413rd Class2022/23
- 374th Class2023/24
- 365th Class2024/25
- 446th Class2025/26
In 3rd Class in 2021/22
66 in 3rd Class (2021/22), 59 in 6th Class (2024/25): 7 pupils fewer.
- 663rd Class2021/22
- 664th Class2022/23
- 655th Class2023/24
- 596th Class2024/25
In 3rd Class in 2020/21
52 in 3rd Class (2020/21), 52 in 6th Class (2023/24): no change.
- 523rd Class2020/21
- 544th Class2021/22
- 565th Class2022/23
- 526th Class2023/24
In 4th Class in 2020/21
44 in 4th Class (2020/21), 48 in 6th Class (2022/23): 4 pupils more.
- 444th Class2020/21
- 475th Class2021/22
- 486th Class2022/23
In 5th Class in 2020/21
54 in 5th Class (2020/21), 57 in 6th Class (2021/22): 3 pupils more.
- 545th Class2020/21
- 576th Class2021/22
Biggest one-year changes in a class
- +383rd Class in 2025/26 (26 to 64)
- −294th Class in 2023/24 (66 to 37)
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 Marys 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
18.7teaching posts
Our estimate: about 19 teachers.
- Class teachersOne for each of the 9 mainstream classes 9
- PrincipalRuns the school and doesn't teach a class 1
- Special education teachers142.5 hours of support teaching a week 5.7
- Special class teachersFor 2 autism classes and a mild general learning disability class 3
9 special needs assistants (SNAs) also work with pupils. 20 pupils are in special classes, which the class sizes leave out.
The NCSE has allocated 6 special education teachers, 3 special class teachers and 9 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 Marys Sen N S, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| St Marys Sen N SThis school | – | 204 |
−11.3%
|
|
| 1 | St Marys Junior N S0.1 km · Dublin 22 · DEIS | 0.1 km | 183 |
−19.4%
|
| 2 | Neillstown N S0.7 km · Dublin 22 · DEIS | 0.7 km | 231 |
−24.3%
|
| 3 | St Bernadettes Junior N S0.8 km · Dublin 22 · DEIS | 0.8 km | 173 |
−19.9%
|
| 4 | St Peter Apostle Sen NS0.8 km · Dublin 22 · DEIS | 0.8 km | 278 |
+8.2%
|
| 5 | St Bernadettes Senior N S0.8 km · Dublin 22 · DEIS | 0.8 km | 194 |
−13.0%
|
| 6 | Divine Mercy Junior National School1.3 km · Lucan · DEIS | 1.3 km | 204 |
−61.0%
|
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
- Aileen Twomey
- Phone
- 016262563
- [email protected]
- Address
- Rowlagh, Clondalkin, Dublin 22, D22 WN40
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
- Palmerstown–Ronanstown–D20–22
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
38 school years from 1979/80 to 2025/26. Class figures start in 2020/21.
| Year | Total | Girls | Boys | JI | SI | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | 204 | 96 | 108 | 0 | 0 | 0 | 0 | 64 | 33 | 63 | 44 |
| 2024/25 | 192 | 95 | 97 | – | – | – | – | 26 | 49 | 36 | 59 |
| 2023/24 | 212 | 103 | 109 | – | – | – | – | 51 | 37 | 65 | 52 |
| 2022/23 | 211 | 103 | 108 | – | – | – | – | 41 | 66 | 56 | 48 |
| 2021/22 | 224 | 106 | 118 | – | – | – | – | 66 | 54 | 47 | 57 |
| 2020/21 | 210 | 105 | 105 | – | – | – | – | 52 | 44 | 54 | 51 |
| 2019/20 | 220 | 104 | 116 | – | – | – | – | – | – | – | – |
| 2018/19 | 228 | 105 | 123 | – | – | – | – | – | – | – | – |
| 2017/18 | 223 | 99 | 124 | – | – | – | – | – | – | – | – |
| 2016/17 | 223 | 98 | 125 | – | – | – | – | – | – | – | – |
| 2015/16 | 230 | 108 | 122 | – | – | – | – | – | – | – | – |
| 2014/15 | 218 | 101 | 117 | – | – | – | – | – | – | – | – |
| 2013/14 | 225 | 103 | 122 | – | – | – | – | – | – | – | – |
| 2012/13 | 221 | 102 | 119 | – | – | – | – | – | – | – | – |
| 2011/12 | 207 | 92 | 115 | – | – | – | – | – | – | – | – |
| 2010/11 | 211 | 94 | 117 | – | – | – | – | – | – | – | – |
| 2009/10 | 219 | 108 | 111 | – | – | – | – | – | – | – | – |
| 2008/09 | 242 | 122 | 120 | – | – | – | – | – | – | – | – |
| 2007/08 | 257 | 132 | 125 | – | – | – | – | – | – | – | – |
| 2006/07 | 271 | 143 | 128 | – | – | – | – | – | – | – | – |
| 2005/06 | 271 | 133 | 138 | – | – | – | – | – | – | – | – |
| 2004/05 | 259 | 120 | 139 | – | – | – | – | – | – | – | – |
| 2003/04 | 265 | 116 | 149 | – | – | – | – | – | – | – | – |
| 2002/03 | 279 | 124 | 155 | – | – | – | – | – | – | – | – |
| 2001/02 | 326 | 156 | 170 | – | – | – | – | – | – | – | – |
| 2000/01 | 356 | 167 | 189 | – | – | – | – | – | – | – | – |
| 1999/00 | 369 | 181 | 188 | – | – | – | – | – | – | – | – |
| 1998/99 | 395 | 180 | 215 | – | – | – | – | – | – | – | – |
| 1997/98 | 394 | 175 | 219 | – | – | – | – | – | – | – | – |
| 1996/97 | 426 | 189 | 237 | – | – | – | – | – | – | – | – |
| 1995/96 | 406 | 183 | 223 | – | – | – | – | – | – | – | – |
| 1994/95 | 437 | 207 | 230 | – | – | – | – | – | – | – | – |
| 1993/94 | 480 | 222 | 258 | – | – | – | – | – | – | – | – |
| 1983/84 | 494 | 242 | 252 | – | – | – | – | – | – | – | – |
| 1982/83 | 438 | 212 | 226 | – | – | – | – | – | – | – | – |
| 1981/82 | 391 | 185 | 206 | – | – | – | – | – | – | – | – |
| 1980/81 | 322 | 155 | 167 | – | – | – | – | – | – | – | – |
| 1979/80 | 207 | 101 | 106 | – | – | – | – | – | – | – | – |