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ST THOMAS SENIOR N S

Roll number: 19765O Jobstown, Tallaght, Dublin 24

School details

Address
Jobstown, Tallaght, Dublin 24 (D24YN90)
Email
[email protected]
Phone
014526555
Principal
Eithne O'Shea
Ethos
Catholic
DEIS
Y
Irish classification
No subjects through Irish
Gaeltacht
N
Island
N
Local authority
South Dublin County Council
School patron
Archbishop of Dublin
School type
Ordinary with Special Classes
School level
Senior
Planning area
Tallaght

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
18.35
2025/26
Mainstream classes
17
2025/26
Largest class group
21
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+
2006/07 301 16 18.81 24 0
2007/08 298 17 17.53 23 0
2008/09 302 18 16.78 21 0
2009/10 315 19 16.58 21 0
2010/11 334 20 16.70 21 0
2011/12 393 21 18.71 24 0
2012/13 401 21 19.10 23 0
2013/14 409 21 19.48 23 0
2014/15 405 21 19.29 22 0
2015/16 400 19 21.05 25 0
2016/17 393 19 20.68 24 0
2017/18 389 19 20.47 23 0
2019/20 372 18 20.67 24 0
2020/21 358 17 21.06 23 0
2021/22 325 17 19.12 21 0
2022/23 344 17 20.24 23 0
2023/24 349 17 20.53 23 0
2024/25 347 17 20.41 23 0
2025/26 312 17 18.35 21 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 75 102 87.2 6
4th Class 72 99 87.5 6
5th Class 76 98 88.7 6
6th Class 80 109 92.7 6
Total 331 631 433.4 34

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
1983/84 193 191 – – – – – – – – 384
1993/94 327 304 – – – – – – – – 631
1994/95 277 337 – – – – – – – – 614
1995/96 276 314 – – – – – – – – 590
1996/97 268 320 – – – – – – – – 588
1997/98 233 311 – – – – – – – – 544
1998/99 226 286 – – – – – – – – 512
1999/00 222 234 – – – – – – – – 456
2000/01 213 216 – – – – – – – – 429
2001/02 206 202 – – – – – – – – 408
2002/03 202 198 – – – – – – – – 400
2003/04 176 198 – – – – – – – – 374
2004/05 181 183 – – – – – – – – 364
2005/06 179 190 – – – – – – – – 369
2006/07 178 206 – – – – – – – – 384
2007/08 183 208 – – – – – – – – 391
2008/09 169 221 – – – – – – – – 390
2009/10 176 229 – – – – – – – – 405
2010/11 205 221 – – – – – – – – 426
2011/12 210 242 – – – – – – – – 452
2012/13 225 236 – – – – – – – – 461
2013/14 208 248 – – – – – – – – 456
2014/15 205 241 – – – – – – – – 446
2015/16 210 232 – – – – – – – – 442
2016/17 201 231 – – – – – – – – 432
2017/18 215 213 – – – – – – – – 428
2018/19 211 212 – – – – – – – – 423
2019/20 192 207 – – – – – – – – 399
2020/21 176 200 – – – – 84 92 91 109 376
2021/22 163 182 – – – – 95 78 88 84 345
2022/23 174 189 – – – – 102 96 76 89 363
2023/24 177 187 – – – – 87 99 98 80 364
2024/25 186 171 – – – – 75 88 97 97 357
2025/26 168 163 – – – – 80 72 82 97 331