St Thomas Junior National School
Lucan · Roll number 19542R
- Catholic ethos
- Not DEIS
- Ordinary with Special Classes
- Pupils in 2025/26
- 573
- +5 on 2024/25
- Over 10 years
- +3%
- Up 17 from 556 in 2015/16
- Girls and boys
- 263 / 310
- 46% girls
Pupils since 1976
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
573 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 | 133 | 123 | 125 | 123 | 148 | 150 | 133.7 |
| Senior Infants | 147 | 138 | 134 | 126 | 127 | 149 | 136.8 |
| 1st Class | 143 | 142 | 138 | 135 | 145 | 132 | 139.2 |
| 2nd Class | 145 | 145 | 146 | 139 | 148 | 142 | 144.2 |
| 3rd Class | – | – | – | – | – | 0 | 0.0 |
| 4th Class | – | – | – | – | – | 0 | 0.0 |
| 5th Class | – | – | – | – | – | 0 | 0.0 |
| 6th Class | – | – | – | – | – | 0 | 0.0 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2024/25
148 in Junior Infants (2024/25), 149 in Senior Infants (2025/26): 1 pupil more.
- 148Junior Infants2024/25
- 149Senior Infants2025/26
Started Junior Infants in 2023/24
123 in Junior Infants (2023/24), 132 in 1st Class (2025/26): 9 pupils more.
- 123Junior Infants2023/24
- 127Senior Infants2024/25
- 1321st Class2025/26
Started Junior Infants in 2022/23
125 in Junior Infants (2022/23), 142 in 2nd Class (2025/26): 17 pupils more.
- 125Junior Infants2022/23
- 126Senior Infants2023/24
- 1451st Class2024/25
- 1422nd Class2025/26
Started Junior Infants in 2021/22
123 in Junior Infants (2021/22), 0 in 3rd Class (2025/26): 123 pupils fewer.
- 123Junior Infants2021/22
- 134Senior Infants2022/23
- 1351st Class2023/24
- 1482nd Class2024/25
- 03rd Class2025/26
Started Junior Infants in 2020/21
133 in Junior Infants (2020/21), 0 in 4th Class (2025/26): 133 pupils fewer.
- 133Junior Infants2020/21
- 138Senior Infants2021/22
- 1381st Class2022/23
- 1392nd Class2023/24
- 04th Class2025/26
In Senior Infants in 2020/21
147 in Senior Infants (2020/21), 0 in 5th Class (2025/26): 147 pupils fewer.
- 147Senior Infants2020/21
- 1421st Class2021/22
- 1462nd Class2022/23
- 05th Class2025/26
In 1st Class in 2020/21
143 in 1st Class (2020/21), 0 in 6th Class (2025/26): 143 pupils fewer.
- 1431st Class2020/21
- 1452nd Class2021/22
- 06th Class2025/26
Biggest one-year changes in a class
- +25Junior Infants in 2024/25 (123 to 148)
- −131st Class in 2025/26 (145 to 132)
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 Junior 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
31teaching posts
Our estimate: about 31 teachers.
- Class teachersOne for each of the 22 mainstream classes 22
- PrincipalRuns the school and doesn't teach a class 1
- Special education teachers175 hours of support teaching a week 7
- Special class teachersFor an autism class 1
9.98 special needs assistants (SNAs) also work with pupils. 6 pupils are in special classes, which the class sizes leave out.
The NCSE has allocated 7.1 special education teachers, 1 special class teacher and 10.15 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 Junior National School, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| St Thomas Junior National SchoolThis school | – | 573 |
+3.1%
|
|
| 1 | Scoil Aine Naofa0.0 km · Lucan | 0.0 km | 614 |
+18.5%
|
| 2 | Esker Educate Together NS0.8 km · Lucan · Multi-denominational · DEIS | 0.8 km | 382 |
−11.2%
|
| 3 | Gaelscoil Eiscir Riada0.8 km · Leamhcán · Gaelscoil | 0.8 km | 376 |
−22.0%
|
| 4 | Gaelscoil Naomh Padraig0.9 km · Leamhcán · Gaelscoil | 0.9 km | 367 |
−23.1%
|
| 5 | St Marys N S1.2 km · Lucan | 1.2 km | 483 |
+14.2%
|
| 6 | Lucan B N S1.3 km · Lucan · Boys | 1.3 km | 501 |
−0.8%
|
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
- Teresa Moynihan-LRussell Coleman Acting Principal 24 25
- Phone
- 016282691
- [email protected]
- Address
- Newcastle Road, Lucan, Co. Dublin, K78 N8X6
School
- Ethos
- Catholic
- Patron
- Archbishop of Dublin
- School type
- Ordinary with Special Classes
- School level
- Junior
- DEIS
- Not 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
- Lucan
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
41 school years from 1976/77 to 2025/26. Class figures start in 2020/21.
| Year | Total | Girls | Boys | JI | SI | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | 573 | 263 | 310 | 150 | 149 | 132 | 142 | 0 | 0 | 0 | 0 |
| 2024/25 | 568 | 268 | 300 | 148 | 127 | 145 | 148 | – | – | – | – |
| 2023/24 | 523 | 252 | 271 | 123 | 126 | 135 | 139 | – | – | – | – |
| 2022/23 | 543 | 277 | 266 | 125 | 134 | 138 | 146 | – | – | – | – |
| 2021/22 | 548 | 292 | 256 | 123 | 138 | 142 | 145 | – | – | – | – |
| 2020/21 | 568 | 288 | 280 | 133 | 147 | 143 | 145 | – | – | – | – |
| 2019/20 | 569 | 288 | 281 | – | – | – | – | – | – | – | – |
| 2018/19 | 556 | 272 | 284 | – | – | – | – | – | – | – | – |
| 2017/18 | 560 | 259 | 301 | – | – | – | – | – | – | – | – |
| 2016/17 | 572 | 278 | 294 | – | – | – | – | – | – | – | – |
| 2015/16 | 556 | 265 | 291 | – | – | – | – | – | – | – | – |
| 2014/15 | 542 | 258 | 284 | – | – | – | – | – | – | – | – |
| 2013/14 | 511 | 251 | 260 | – | – | – | – | – | – | – | – |
| 2012/13 | 514 | 241 | 273 | – | – | – | – | – | – | – | – |
| 2011/12 | 512 | 250 | 262 | – | – | – | – | – | – | – | – |
| 2010/11 | 505 | 250 | 255 | – | – | – | – | – | – | – | – |
| 2009/10 | 506 | 247 | 259 | – | – | – | – | – | – | – | – |
| 2008/09 | 476 | 244 | 232 | – | – | – | – | – | – | – | – |
| 2007/08 | 457 | 224 | 233 | – | – | – | – | – | – | – | – |
| 2006/07 | 460 | 230 | 230 | – | – | – | – | – | – | – | – |
| 2005/06 | 463 | 226 | 237 | – | – | – | – | – | – | – | – |
| 2004/05 | 466 | 220 | 246 | – | – | – | – | – | – | – | – |
| 2003/04 | 460 | 229 | 231 | – | – | – | – | – | – | – | – |
| 2002/03 | 441 | 197 | 244 | – | – | – | – | – | – | – | – |
| 2001/02 | 420 | 187 | 233 | – | – | – | – | – | – | – | – |
| 2000/01 | 390 | 172 | 218 | – | – | – | – | – | – | – | – |
| 1999/00 | 360 | 158 | 202 | – | – | – | – | – | – | – | – |
| 1998/99 | 350 | 155 | 195 | – | – | – | – | – | – | – | – |
| 1997/98 | 323 | 149 | 174 | – | – | – | – | – | – | – | – |
| 1996/97 | 339 | 158 | 181 | – | – | – | – | – | – | – | – |
| 1995/96 | 361 | 173 | 188 | – | – | – | – | – | – | – | – |
| 1994/95 | 339 | 160 | 179 | – | – | – | – | – | – | – | – |
| 1993/94 | 353 | 165 | 188 | – | – | – | – | – | – | – | – |
| 1983/84 | 685 | 287 | 398 | – | – | – | – | – | – | – | – |
| 1982/83 | 653 | 282 | 371 | – | – | – | – | – | – | – | – |
| 1981/82 | 584 | 267 | 317 | – | – | – | – | – | – | – | – |
| 1980/81 | 542 | 247 | 295 | – | – | – | – | – | – | – | – |
| 1979/80 | 462 | 205 | 257 | – | – | – | – | – | – | – | – |
| 1978/79 | 314 | – | – | – | – | – | – | – | – | – | – |
| 1977/78 | 196 | 75 | 121 | – | – | – | – | – | – | – | – |
| 1976/77 | 99 | 38 | 61 | – | – | – | – | – | – | – | – |