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HOLY TRINITY SEN N S

Roll number: 19406J Grange Road, Donaghmede, Dublin 13

School details

Address
Grange Road, Donaghmede, Dublin 13 (D13WY00)
Email
[email protected]
Phone
018474695
Principal
David Henry
Ethos
Catholic
DEIS
N
Irish classification
No subjects through Irish
Gaeltacht
N
Island
N
Local authority
Dublin City Council
School patron
Archbishop of Dublin
School type
Ordinary with Special Classes
School level
Senior
Planning area
Donaghmede_Howth_D13

Class size history

Mainstream class group data is shown separately from standard/year-group enrolment data. The source does not identify which standard/year group each class group belongs to.

Average class size
24.06
2025/26
Mainstream classes
16
2025/26
Largest class group
26
2025/26
Classes with 30+ pupils
0
2025/26

Class group metrics trend

Class group metrics by year

Year Mainstream class pupils Mainstream classes Average class size Largest class Classes 30+
2006/07 248 9 27.56 32 5
2007/08 260 9 28.89 33 5
2008/09 287 10 28.70 34 4
2009/10 328 11 29.82 34 5
2010/11 353 13 27.15 31 6
2011/12 345 13 26.54 31 4
2012/13 334 13 25.69 29 0
2013/14 322 12 26.83 31 2
2014/15 323 12 26.92 30 1
2015/16 335 12 27.92 31 4
2016/17 344 13 26.46 31 3
2017/18 354 13 27.23 30 6
2019/20 369 14 26.36 30 2
2020/21 382 14 27.29 30 1
2021/22 389 15 25.93 30 1
2022/23 396 16 24.75 27 0
2023/24 389 16 24.31 26 0
2024/25 389 16 24.31 26 0
2025/26 385 16 24.06 26 0

Data highlights

Key numbers to spot outliers or notable changes.

Summary statistics (class-level data)

Min / max / mean enrolment per class across the available final by-standard years.

Class Min Max Mean Years
Junior Infants 0 0 0.0 1
Senior Infants 0 0 0.0 1
1st Class 0 0 0.0 1
2nd Class 0 0 0.0 1
3rd Class 92 103 97.3 6
4th Class 95 106 100.0 6
5th Class 85 101 96.7 6
6th Class 84 103 96.8 6
Total 229 727 389.3 42

Total enrolment over time

Total and gender trends use historical records where available. Class-level data starts in 2020/21.

Enrolment by gender over time

Enrolment by class over time

Cohort progression

Track how each cohort (pupils who were in the same class in the same year) progresses through the school. Each step shows the count; the number between steps is the net change (pupils gained minus pupils lost).

Cohort 2025/26
JI 2025/26 0

Raw data by year

Year Female Male JI SI 1st 2nd 3rd 4th 5th 6th Total
1974/75 337 390 – – – – – – – – 727
1975/76 – – – – – – – – – – 687
1976/77 325 352 – – – – – – – – 677
1977/78 314 336 – – – – – – – – 650
1978/79 332 329 – – – – – – – – 661
1979/80 322 304 – – – – – – – – 626
1980/81 294 293 – – – – – – – – 587
1981/82 271 245 – – – – – – – – 516
1982/83 261 256 – – – – – – – – 517
1993/94 158 200 – – – – – – – – 358
1994/95 146 169 – – – – – – – – 315
1995/96 115 163 – – – – – – – – 278
1996/97 136 170 – – – – – – – – 306
1997/98 131 160 – – – – – – – – 291
1998/99 128 151 – – – – – – – – 279
1999/00 136 136 – – – – – – – – 272
2000/01 135 126 – – – – – – – – 261
2001/02 135 138 – – – – – – – – 273
2002/03 127 145 – – – – – – – – 272
2003/04 130 137 – – – – – – – – 267
2004/05 126 151 – – – – – – – – 277
2005/06 96 133 – – – – – – – – 229
2006/07 112 136 – – – – – – – – 248
2007/08 115 145 – – – – – – – – 260
2008/09 129 158 – – – – – – – – 287
2009/10 153 175 – – – – – – – – 328
2010/11 159 194 – – – – – – – – 353
2011/12 157 188 – – – – – – – – 345
2012/13 155 184 – – – – – – – – 339
2013/14 149 179 – – – – – – – – 328
2014/15 161 169 – – – – – – – – 330
2015/16 168 179 – – – – – – – – 347
2016/17 165 189 – – – – – – – – 354
2017/18 179 187 – – – – – – – – 366
2018/19 168 188 – – – – – – – – 356
2019/20 178 203 – – – – – – – – 381
2020/21 195 199 – – – – 103 106 85 88 394
2021/22 200 201 – – – – 103 101 101 84 401
2022/23 203 205 – – – – 92 102 100 102 408
2023/24 213 188 – – – – 92 96 101 101 401
2024/25 202 199 – – – – 95 95 98 103 401
2025/26 199 198 – – – – 99 100 95 103 397