St. Mary's National School
Dublin 18 · Roll number 02872U
- Catholic ethos
- Not DEIS
- Pupils in 2025/26
- 242
- −2 on 2024/25
- Over 10 years
- −7%
- Down 17 from 259 in 2015/16
- Girls and boys
- 118 / 124
- 49% 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
242 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 | 25 | 48 | 31 | 30 | 32 | 32 | 33.0 |
| Senior Infants | 32 | 25 | 42 | 28 | 29 | 30 | 31.0 |
| 1st Class | 30 | 31 | 24 | 42 | 26 | 28 | 30.2 |
| 2nd Class | 27 | 28 | 30 | 26 | 43 | 26 | 30.0 |
| 3rd Class | 27 | 29 | 29 | 29 | 26 | 48 | 31.3 |
| 4th Class | 34 | 26 | 29 | 26 | 29 | 24 | 28.0 |
| 5th Class | 29 | 34 | 31 | 30 | 28 | 29 | 30.2 |
| 6th Class | 52 | 28 | 34 | 31 | 31 | 25 | 33.5 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2024/25
32 in Junior Infants (2024/25), 30 in Senior Infants (2025/26): 2 pupils fewer.
- 32Junior Infants2024/25
- 30Senior Infants2025/26
Started Junior Infants in 2023/24
30 in Junior Infants (2023/24), 28 in 1st Class (2025/26): 2 pupils fewer.
- 30Junior Infants2023/24
- 29Senior Infants2024/25
- 281st Class2025/26
Started Junior Infants in 2022/23
31 in Junior Infants (2022/23), 26 in 2nd Class (2025/26): 5 pupils fewer.
- 31Junior Infants2022/23
- 28Senior Infants2023/24
- 261st Class2024/25
- 262nd Class2025/26
Started Junior Infants in 2021/22
48 in Junior Infants (2021/22), 48 in 3rd Class (2025/26): no change.
- 48Junior Infants2021/22
- 42Senior Infants2022/23
- 421st Class2023/24
- 432nd Class2024/25
- 483rd Class2025/26
Started Junior Infants in 2020/21
25 in Junior Infants (2020/21), 24 in 4th Class (2025/26): 1 pupil fewer.
- 25Junior Infants2020/21
- 25Senior Infants2021/22
- 241st Class2022/23
- 262nd Class2023/24
- 263rd Class2024/25
- 244th Class2025/26
In Senior Infants in 2020/21
32 in Senior Infants (2020/21), 29 in 5th Class (2025/26): 3 pupils fewer.
- 32Senior Infants2020/21
- 311st Class2021/22
- 302nd Class2022/23
- 293rd Class2023/24
- 294th Class2024/25
- 295th Class2025/26
In 1st Class in 2020/21
30 in 1st Class (2020/21), 25 in 6th Class (2025/26): 5 pupils fewer.
- 301st Class2020/21
- 282nd Class2021/22
- 293rd Class2022/23
- 264th Class2023/24
- 285th Class2024/25
- 256th Class2025/26
In 2nd Class in 2020/21
27 in 2nd Class (2020/21), 31 in 6th Class (2024/25): 4 pupils more.
- 272nd Class2020/21
- 293rd Class2021/22
- 294th Class2022/23
- 305th Class2023/24
- 316th Class2024/25
In 3rd Class in 2020/21
27 in 3rd Class (2020/21), 31 in 6th Class (2023/24): 4 pupils more.
- 273rd Class2020/21
- 264th Class2021/22
- 315th Class2022/23
- 316th Class2023/24
In 4th Class in 2020/21
34 in 4th Class (2020/21), 34 in 6th Class (2022/23): no change.
- 344th Class2020/21
- 345th Class2021/22
- 346th Class2022/23
In 5th Class in 2020/21
29 in 5th Class (2020/21), 28 in 6th Class (2021/22): 1 pupil fewer.
- 295th Class2020/21
- 286th Class2021/22
Biggest one-year changes in a class
- +23Junior Infants in 2021/22 (25 to 48)
- −246th Class in 2021/22 (52 to 28)
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. Mary's National School, 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
16.5teaching posts
Our estimate: about 16 teachers.
- Class teachersOne for each of the 10 mainstream classes 10
- PrincipalRuns the school and doesn't teach a class 1
- Special education teachers137.5 hours of support teaching a week 5.5
8.66 special needs assistants (SNAs) also work with pupils.
The NCSE has allocated 5.5 special education teachers and 8.66 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. Where there's no principal bar, the principal also taught a class. 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. Mary's National School, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| St. Mary's National SchoolThis school | – | 242 |
−6.6%
|
|
| 1 | Stepaside Educate Together National School0.9 km · Dublin 18 · Multi-denominational | 0.9 km | 542 |
+351.7%
|
| 2 | Gaelscoil Thaobh na Coille1.1 km · Baile Átha Cliath 18 · Gaelscoil | 1.1 km | 402 |
−9.0%
|
| 3 | Queen of Angels Primary School1.4 km · Dublin 16 · DEIS | 1.4 km | 224 |
−10.8%
|
| 4 | ST Olaf's National School2.0 km · Dublin 16 | 2.0 km | 591 |
+30.5%
|
| 5 | Ballinteer Educate Together National School2.1 km · Dublin 16 · Multi-denominational | 2.1 km | 399 |
+121.7%
|
| 6 | Holy Trinity National School2.2 km · Dublin 18 | 2.2 km | 586 |
+37.6%
|
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
- Fergus Lyons
- Phone
- 012954173
- [email protected]
- Address
- Lamb's Cross, Sandyford, Dublin 18, D18 XV90
School
- Ethos
- Catholic
- Patron
- Archbishop of Dublin
- School type
- Ordinary
- School level
- All Through
- DEIS
- Not DEIS
Language and area
- Irish classification
- No subjects through Irish
- Gaeltacht
- Non-Gaeltacht
- Island
- Not on an island
- Local authority
- Dun Laoghaire Rathdown
- Planning area
- Ballinteer–Stepaside–DLR
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
43 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 | 242 | 118 | 124 | 32 | 30 | 28 | 26 | 48 | 24 | 29 | 25 |
| 2024/25 | 244 | 127 | 117 | 32 | 29 | 26 | 43 | 26 | 29 | 28 | 31 |
| 2023/24 | 242 | 120 | 122 | 30 | 28 | 42 | 26 | 29 | 26 | 30 | 31 |
| 2022/23 | 250 | 118 | 132 | 31 | 42 | 24 | 30 | 29 | 29 | 31 | 34 |
| 2021/22 | 249 | 115 | 134 | 48 | 25 | 31 | 28 | 29 | 26 | 34 | 28 |
| 2020/21 | 256 | 115 | 141 | 25 | 32 | 30 | 27 | 27 | 34 | 29 | 52 |
| 2019/20 | 265 | 124 | 141 | – | – | – | – | – | – | – | – |
| 2018/19 | 263 | 129 | 134 | – | – | – | – | – | – | – | – |
| 2017/18 | 263 | 124 | 139 | – | – | – | – | – | – | – | – |
| 2016/17 | 264 | 128 | 136 | – | – | – | – | – | – | – | – |
| 2015/16 | 259 | 128 | 131 | – | – | – | – | – | – | – | – |
| 2014/15 | 260 | 136 | 124 | – | – | – | – | – | – | – | – |
| 2013/14 | 257 | 144 | 113 | – | – | – | – | – | – | – | – |
| 2012/13 | 226 | 124 | 102 | – | – | – | – | – | – | – | – |
| 2011/12 | 212 | 117 | 95 | – | – | – | – | – | – | – | – |
| 2010/11 | 183 | 91 | 92 | – | – | – | – | – | – | – | – |
| 2009/10 | 159 | 79 | 80 | – | – | – | – | – | – | – | – |
| 2008/09 | 126 | 62 | 64 | – | – | – | – | – | – | – | – |
| 2007/08 | 106 | 55 | 51 | – | – | – | – | – | – | – | – |
| 2006/07 | 101 | 48 | 53 | – | – | – | – | – | – | – | – |
| 2005/06 | 109 | 53 | 56 | – | – | – | – | – | – | – | – |
| 2004/05 | 106 | 57 | 49 | – | – | – | – | – | – | – | – |
| 2003/04 | 97 | 44 | 53 | – | – | – | – | – | – | – | – |
| 2002/03 | 100 | 41 | 59 | – | – | – | – | – | – | – | – |
| 2001/02 | 95 | 41 | 54 | – | – | – | – | – | – | – | – |
| 2000/01 | 88 | 32 | 56 | – | – | – | – | – | – | – | – |
| 1999/00 | 85 | 31 | 54 | – | – | – | – | – | – | – | – |
| 1998/99 | 90 | 38 | 52 | – | – | – | – | – | – | – | – |
| 1997/98 | 84 | 36 | 48 | – | – | – | – | – | – | – | – |
| 1996/97 | 77 | 35 | 42 | – | – | – | – | – | – | – | – |
| 1995/96 | 85 | 34 | 51 | – | – | – | – | – | – | – | – |
| 1994/95 | 89 | 41 | 48 | – | – | – | – | – | – | – | – |
| 1993/94 | 101 | 48 | 53 | – | – | – | – | – | – | – | – |
| 1983/84 | 163 | 68 | 95 | – | – | – | – | – | – | – | – |
| 1982/83 | 146 | 59 | 87 | – | – | – | – | – | – | – | – |
| 1981/82 | 110 | 45 | 65 | – | – | – | – | – | – | – | – |
| 1980/81 | 81 | 32 | 49 | – | – | – | – | – | – | – | – |
| 1979/80 | 69 | 30 | 39 | – | – | – | – | – | – | – | – |
| 1978/79 | 71 | – | – | – | – | – | – | – | – | – | – |
| 1977/78 | 84 | 35 | 49 | – | – | – | – | – | – | – | – |
| 1976/77 | 105 | 45 | 60 | – | – | – | – | – | – | – | – |
| 1975/76 | 86 | – | – | – | – | – | – | – | – | – | – |
| 1974/75 | 99 | 42 | 57 | – | – | – | – | – | – | – | – |