The Harold School
Glasthule · Roll number 20141G
- Catholic ethos
- Not DEIS
- Ordinary with Special Classes
- Pupils in 2025/26
- 642
- −7 on 2024/25
- Over 10 years
- −6%
- Down 38 from 680 in 2015/16
- Girls and boys
- 325 / 317
- 51% girls
Pupils since 2001
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
642 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 | 86 | 82 | 83 | 85 | 86 | 83 | 84.2 |
| Senior Infants | 89 | 84 | 82 | 84 | 81 | 88 | 84.7 |
| 1st Class | 91 | 90 | 88 | 85 | 86 | 78 | 86.3 |
| 2nd Class | 81 | 90 | 89 | 84 | 85 | 84 | 85.5 |
| 3rd Class | 80 | 79 | 88 | 84 | 75 | 82 | 81.3 |
| 4th Class | 80 | 83 | 77 | 84 | 83 | 75 | 80.3 |
| 5th Class | 76 | 85 | 81 | 75 | 83 | 81 | 80.2 |
| 6th Class | 75 | 71 | 74 | 73 | 70 | 71 | 72.3 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2024/25
86 in Junior Infants (2024/25), 88 in Senior Infants (2025/26): 2 pupils more.
- 86Junior Infants2024/25
- 88Senior Infants2025/26
Started Junior Infants in 2023/24
85 in Junior Infants (2023/24), 78 in 1st Class (2025/26): 7 pupils fewer.
- 85Junior Infants2023/24
- 81Senior Infants2024/25
- 781st Class2025/26
Started Junior Infants in 2022/23
83 in Junior Infants (2022/23), 84 in 2nd Class (2025/26): 1 pupil more.
- 83Junior Infants2022/23
- 84Senior Infants2023/24
- 861st Class2024/25
- 842nd Class2025/26
Started Junior Infants in 2021/22
82 in Junior Infants (2021/22), 82 in 3rd Class (2025/26): no change.
- 82Junior Infants2021/22
- 82Senior Infants2022/23
- 851st Class2023/24
- 852nd Class2024/25
- 823rd Class2025/26
Started Junior Infants in 2020/21
86 in Junior Infants (2020/21), 75 in 4th Class (2025/26): 11 pupils fewer.
- 86Junior Infants2020/21
- 84Senior Infants2021/22
- 881st Class2022/23
- 842nd Class2023/24
- 753rd Class2024/25
- 754th Class2025/26
In Senior Infants in 2020/21
89 in Senior Infants (2020/21), 81 in 5th Class (2025/26): 8 pupils fewer.
- 89Senior Infants2020/21
- 901st Class2021/22
- 892nd Class2022/23
- 843rd Class2023/24
- 834th Class2024/25
- 815th Class2025/26
In 1st Class in 2020/21
91 in 1st Class (2020/21), 71 in 6th Class (2025/26): 20 pupils fewer.
- 911st Class2020/21
- 902nd Class2021/22
- 883rd Class2022/23
- 844th Class2023/24
- 835th Class2024/25
- 716th Class2025/26
In 2nd Class in 2020/21
81 in 2nd Class (2020/21), 70 in 6th Class (2024/25): 11 pupils fewer.
- 812nd Class2020/21
- 793rd Class2021/22
- 774th Class2022/23
- 755th Class2023/24
- 706th Class2024/25
In 3rd Class in 2020/21
80 in 3rd Class (2020/21), 73 in 6th Class (2023/24): 7 pupils fewer.
- 803rd Class2020/21
- 834th Class2021/22
- 815th Class2022/23
- 736th Class2023/24
In 4th Class in 2020/21
80 in 4th Class (2020/21), 74 in 6th Class (2022/23): 6 pupils fewer.
- 804th Class2020/21
- 855th Class2021/22
- 746th Class2022/23
In 5th Class in 2020/21
76 in 5th Class (2020/21), 71 in 6th Class (2021/22): 5 pupils fewer.
- 765th Class2020/21
- 716th Class2021/22
Biggest one-year changes in a class
- +92nd Class in 2021/22 (81 to 90)
- −93rd Class in 2024/25 (84 to 75)
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 The Harold 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
38teaching posts
Our estimate: about 38 teachers.
- Class teachersOne for each of the 27 mainstream classes 27
- PrincipalRuns the school and doesn't teach a class 1
- Deputy principalDoesn't teach a class either, as larger schools and those with five or more special classes have one 1
- Special education teachers200 hours of support teaching a week 8
- Special class teachersFor an autism class 1
8.83 special needs assistants (SNAs) also work with pupils. 6 pupils are in special classes, which the class sizes leave out.
The NCSE has allocated 8 special education teachers, 1 special class teacher and 8.83 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 The Harold School, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| The Harold SchoolThis school | – | 642 |
−5.6%
|
|
| 1 | St Josephs1.0 km · Dun Laoghaire · DEIS | 1.0 km | 370 |
+174.1%
|
| 2 | Clochar San Dominic1.1 km · Dun Laoghaire · DEIS | 1.1 km | 184 |
−6.6%
|
| 3 | Sallynoggin Educate Together National School1.3 km · Sallynoggin · Multi-denominational | 1.3 km | 45 | – |
| 4 | Dalkey School Project1.4 km · Glenageary · Multi-denominational | 1.4 km | 220 |
−8.3%
|
| 5 | St Kevins N S1.4 km · Sallynoggin · DEIS | 1.4 km | 229 |
+42.2%
|
| 6 | Dalkey N S (2)1.6 km · Dalkey · Church of Ireland | 1.6 km | 101 |
+1.0%
|
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
- Dervla Nic Mhathúna
- Phone
- 012805708
- [email protected]
- Address
- Eden Road, Glasthule, Co. Dublin, A96 X043
School
- Ethos
- Catholic
- Patron
- Archbishop of Dublin
- School type
- Ordinary with Special Classes
- 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
- Dunlaoghaire
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
25 school years from 2001/02 to 2025/26. Class figures start in 2020/21.
| Year | Total | Girls | Boys | JI | SI | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | 642 | 325 | 317 | 83 | 88 | 78 | 84 | 82 | 75 | 81 | 71 |
| 2024/25 | 649 | 341 | 308 | 86 | 81 | 86 | 85 | 75 | 83 | 83 | 70 |
| 2023/24 | 654 | 344 | 310 | 85 | 84 | 85 | 84 | 84 | 84 | 75 | 73 |
| 2022/23 | 662 | 341 | 321 | 83 | 82 | 88 | 89 | 88 | 77 | 81 | 74 |
| 2021/22 | 664 | 341 | 323 | 82 | 84 | 90 | 90 | 79 | 83 | 85 | 71 |
| 2020/21 | 658 | 339 | 319 | 86 | 89 | 91 | 81 | 80 | 80 | 76 | 75 |
| 2019/20 | 677 | 351 | 326 | – | – | – | – | – | – | – | – |
| 2018/19 | 671 | 354 | 317 | – | – | – | – | – | – | – | – |
| 2017/18 | 667 | 336 | 331 | – | – | – | – | – | – | – | – |
| 2016/17 | 670 | 335 | 335 | – | – | – | – | – | – | – | – |
| 2015/16 | 680 | 337 | 343 | – | – | – | – | – | – | – | – |
| 2014/15 | 663 | 325 | 338 | – | – | – | – | – | – | – | – |
| 2013/14 | 630 | 319 | 311 | – | – | – | – | – | – | – | – |
| 2012/13 | 615 | 315 | 300 | – | – | – | – | – | – | – | – |
| 2011/12 | 611 | 305 | 306 | – | – | – | – | – | – | – | – |
| 2010/11 | 585 | 291 | 294 | – | – | – | – | – | – | – | – |
| 2009/10 | 547 | 264 | 283 | – | – | – | – | – | – | – | – |
| 2008/09 | 515 | 241 | 274 | – | – | – | – | – | – | – | – |
| 2007/08 | 496 | 234 | 262 | – | – | – | – | – | – | – | – |
| 2006/07 | 496 | 235 | 261 | – | – | – | – | – | – | – | – |
| 2005/06 | 491 | 231 | 260 | – | – | – | – | – | – | – | – |
| 2004/05 | 487 | 234 | 253 | – | – | – | – | – | – | – | – |
| 2003/04 | 472 | 238 | 234 | – | – | – | – | – | – | – | – |
| 2002/03 | 475 | 248 | 227 | – | – | – | – | – | – | – | – |
| 2001/02 | 463 | 235 | 228 | – | – | – | – | – | – | – | – |