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Local authority in Dublin

Dun Laoghaire Rathdown

Schools in County Dublin in this local authority.

Other local authorities in Dublin Dublin City Council · 192 Fingal County Council · 99 South Dublin County Council · 100
Schools
68
of 459 in Dublin
Pupils
20,151
15% of Dublin's pupils
Average school size
296.3
Dublin: 289.6
Average class size
23.64
Dublin: 22.23

Growing and falling since 2015/16

Each school's change in pupils over 10 years, from 2015/16 to 2025/26. A change of 10% or more either way counts as growing or falling.

Every school's change

59 schools with figures for both years

Schools still filling their classes in 2015/16, and schools opened since, are listed separately.

24fell by 10% or more
27within 10%
8grew by 10% or more
Down 25% or more · 6Down 10 to 25% · 18Within 10% · 27Up 10 to 25% · 2Up 25% or more · 6

Average class size in these schools went from 26.6 in 2015/16 to 23.7 in 2025/26. 14 of the 24 schools that fell by 10% or more kept or added classes. A fall in pupils can mean smaller classes rather than fewer children wanting places. Smaller classes

Grown most

Pupils in 2015/16 and 2025/26

  1. 1 St JosephsDun Laoghaire, Co. Dublin 135 → 370 +174.1%
  2. 2 St Kevins N SSallynoggin, Co. Dublin 161 → 229 +42.2%
  3. 3 Islamic National SchoolDublin 14, Co. Dublin 296 → 414 +39.9%
  4. 4 Holy Trinity National SchoolDublin 18, Co. Dublin 426 → 586 +37.6%
  5. 5 ST Olaf's National SchoolDublin 16, Co. Dublin 453 → 591 +30.5%

Fallen most

Pupils in 2015/16 and 2025/26

  1. 1 Booterstown BoysBlackrock, Co. Dublin 291 → 188 −35.4%
  2. 2 Scoil an Maighdine Mhuire BoysDublin 16, Co. Dublin 249 → 176 −29.3%
  3. 3 Na Maighdine Muire GirlDublin 16, Co. Dublin 281 → 200 −28.8%
  4. 4 Our Ladys N SDublin 14, Co. Dublin 245 → 176 −28.2%
  5. 5 Gaelscoil PhadraigBaile Breac, Co. Dublin 163 → 118 −27.6%

Ranked by percentage change. Only schools with 50 or more pupils in 2015/16 are ranked, leaving out any still filling their classes then, because a few pupils make a big percentage in a small or new school. An amalgamation, a new school nearby or smaller classes can also explain a big rise or fall.

Newer schools

9 schools still filling their classes in 2015/16 or opened since, with 2,483 pupils between them. They aren’t in the figures above.

Class sizes

Mainstream class groups only. The source does not identify which standard/year group each class group belongs to.

Average class size
23.64
Mainstream classes
840
Classes of 30 or more
48
Schools with a class of 30+
19

Teachers

Teachers in the 68 mainstream primary schools here, 2006/07 to 2025/26. Class teachers are counted every year; all teaching posts where they're known.

How we count teachers
Class teachers in 2025/26
840
Up 227 since 2006/07, while pupils rose 27%
Teaching posts in 2025/26
about 1,262
Estimate: 840 class teachers, 63 principals and deputies, 311 special education and 48 special class teachers
Teachers in 2015/16
1,043
The Department's last count of every teacher
Since 2024/25
10 / 13
10 schools gained a class teacher, 13 lost one

Class teachers since 2006/07

One for each mainstream class, every school year

What parents would prefer

6,055 of the 15,166 households with children at the 68 schools here answered the Department of Education and Youth's Primary School Survey, November–December 2025. These are preferences, not applications.

About these figures
The Department's own results: Interactive mapSummary report with county figures (PDF)
Prefer a multi-denominational patron
59%
Parents of children at school · Ireland 44%
Prefer teaching through Irish
21%
Parents of children at school · Ireland 20%
Prefer single-sex
9%
Parents of children at school · Ireland 5%
  • 47 schools where half or more of parents would prefer a multi-denominational patron
  • 8 schools where a quarter or more would prefer teaching through Irish
  • 15 of 15 single-sex schools where most parents would prefer co-educational

Source: Department of Education and Youth, Primary School Survey results, published 23 June 2026. Figures here add up the parents at each school with its own results.

Schools

68 schools, largest first.

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Roll number
The Harold SchoolGlasthule 20141G 642
−5.6%
+30.8%
27 23.56 28 0
ST Olaf's National SchoolDublin 16 19319O 591
+30.5%
+72.8%
23 25.70 27 0
Holy Trinity National SchoolDublin 18 20190T 586
+37.6%
– 24 24.42 26 0
Carysfort NSBlackrock 14586M 583
+7.0%
+16.8%
24 24.29 29 0
Stepaside Educate Together National SchoolDublin 18 20401G 542 – – 24 22.08 26 0
Scoil Padraig Naofa BBlackrock 19258U 499
−22.9%
−16.8%
21 23.48 30 1
St Brigids Girls N SDublin 18 16353W 499
−8.4%
−3.3%
20 24.95 30 6
Scoil LorcáinBaile na Manach 18451J 485
−0.6%
+11.2%
19 25.53 31 9
St Patricks GNSDublin 18 19259W 478
−15.2%
+1.3%
20 23.90 35 2
Gaelscoil na FuinseoigeBác 14 20487T 441 – – 17 25.59 31 5
St Annes MXD N SShankill 19888H 440
−13.9%
−12.4%
18 24.11 29 0
S N Cnoc AinbhilStillorgan 17979A 434
−6.9%
+11.9%
18 24.11 31 4
S N San TreasaMount Merrion 18647D 430
−5.7%
−6.9%
16 26.88 29 0
Oatlands Primary School, An Edmund Rice SchoolBlackrock 17954H 428
−0.7%
+44.6%
17 25.18 30 1
Monkstown Eucate Together NSDun Laoghaire 20060G 415
−5.3%
+80.4%
16 25.56 30 1
Islamic National SchoolDublin 14 19949B 414
+39.9%
+52.2%
17 24.00 30 1
Scoil na nAingealBlackrock 19335M 410
−11.4%
−7.2%
17 24.12 28 0
Our lady's Grove Primary SchoolDublin 14 19374W 409
−6.2%
+31.1%
16 25.56 29 0
St Brigids Boys N SDublin 18 16352U 406
−20.9%
−10.8%
16 25.38 28 0
Gaelscoil Thaobh na CoilleBaile Átha Cliath 18 20020R 402
−9.0%
+87.9%
17 23.65 28 0
Ballinteer Educate Together National SchoolDublin 16 20400E 399 – – 16 24.19 27 0
Our Lady Good Counsel GNSDun Laoghaire 19321B 398
−13.5%
−11.4%
16 23.75 29 0
S N Naomh LorcanStillorgan 16893I 390
−12.2%
−6.7%
16 24.38 29 0
Our Lady of Good Counsel Boys N SDún Laoghaire 19320W 389
−10.0%
−11.8%
16 24.31 28 0
Taney N SDublin 14 15284B 384
−12.3%
−18.6%
16 24.00 28 0
St Raphaelas N SBlackrock 17470I 375
−20.4%
+72.0%
15 25.00 31 2
St Attractas Senior N SDublin 16 19716B 371
+6.9%
−3.1%
15 24.33 31 3
St JosephsDun Laoghaire 19938T 370
+174.1%
+176.1%
17 21.35 27 0
Gaelscoil Shliabh RuaBaile Átha Cliath 18 20425U 359 – – 16 22.44 29 0
St Attractas Junior N SDublin 16 19537B 337
−2.6%
−6.9%
14 24.07 30 2
Loreto National SchoolDalkey 19066L 314
−16.9%
+1.6%
12 25.17 29 0
Our Lady of the Wayside NSDublin 18 18806U 292
−9.9%
−6.7%
12 24.33 27 0
Holy Cross N SDublin 14 19904C 260
+11.6%
+10.6%
11 23.64 28 0
Scoil MhuireDublin 18 19497P 249
−24.3%
−17.5%
12 20.25 27 0
Our Lady of Mercy Convent SchoolBooterstown 17970F 247
+1.2%
+9.3%
10 24.70 30 2
St. Mary's National SchoolDublin 18 02872U 242
−6.6%
+122.0%
10 24.20 30 1
Scoil NaithiBaile Átha Cliath 16 19437U 231
−4.1%
−0.4%
8 28.88 31 4
St Kevins N SSallynoggin 19979K 229
+42.2%
+73.5%
11 20.82 29 0
Queen of Angels Primary SchoolDublin 16 19723V 224
−10.8%
−31.9%
10 21.80 29 0
Cherrywood Educate Together National SchoolDublin 18 20535E 220 – – 9 23.11 25 0
Dalkey School ProjectGlenageary 19612M 220
−8.3%
−7.9%
8 27.50 30 1
S N Gleann na gCaorach Iníon LéinínKilliney 19400U 211
−9.1%
−12.4%
9 23.44 27 0
Scoil Naisiunta an Dea AoireDublin 14 19939V 209
+15.5%
−18.4%
9 19.89 25 0
Kill-O'-The-Grange NSBlackrock 18886V 208
−4.6%
−13.3%
8 25.25 28 0
Kilternan Church of Ireland NSDublin 18 16629O 206
−11.2%
+41.1%
8 24.25 28 0
Rathmichael N SDublin 18 11873A 205
−3.3%
−8.5%
8 25.62 29 0
Na Maighdine Muire GirlDublin 16 19396J 200
−28.8%
+18.3%
9 21.56 28 0
Booterstown BoysBlackrock 06200O 188
−35.4%
−10.9%
8 22.75 29 0
Rathfarnham Educate TogetherDublin 14 19945Q 188
−15.7%
−16.4%
8 23.50 28 0
S N Padraig NaofaKiltiernan 17507F 185
0.0%
+101.1%
7 25.57 32 1
Clochar San DominicDun Laoghaire 05600C 184
−6.6%
−7.1%
10 17.20 21 0
Dun Laoghaire ETNSMonkstown 20503O 177 – – 8 22.12 32 1
Our Ladys N SDublin 14 19922E 176
−28.2%
+155.1%
8 21.38 27 0
Scoil an Maighdine Mhuire BoysDublin 16 19314E 176
−29.3%
+12.8%
8 20.75 29 0
Goatstown Stillorgan Primary SchoolDublin 14 20523U 170 – – 7 23.43 28 0
St Johns N SBallybrack 19960M 165
+7.8%
+29.9%
8 18.38 24 0
Holy Family SchoolGlenageary 19840C 149
+26.3%
+24.2%
8 17.12 22 0
Scoil Colmcille SeniorBallybrack 19438W 147
−26.5%
−21.4%
7 20.14 23 0
Gaelscoil LaigheanBaile Átha Cliath 14 20518E 130 – – 5 26.00 33 1
Scoil Cholmcille Junior NSBallybrack 19641T 124
−9.5%
−33.7%
7 17.71 27 0
Gaelscoil PhadraigBaile Breac 20056P 118
−27.6%
+0.9%
5 22.80 25 0
St Columbanus National SchoolDun Laoghaire 20218P 113
+6.6%
−30.2%
6 15.83 19 0
Harold Boys N SDalkey 15132B 106
−12.4%
+34.2%
5 21.20 25 0
Dalkey N S (2)Dalkey 14647G 101
+1.0%
+4.1%
4 25.25 27 0
St Brigids N SStillorgan 16794G 100
+1.0%
+7.5%
4 25.00 27 0
Booterstown N SBlackrock 19901T 85
−18.3%
−7.6%
4 21.25 26 0
All Saints N SBlackrock 10494K 51
−19.0%
−8.9%
3 17.00 20 0
Sallynoggin Educate Together National SchoolSallynoggin 20543D 45 – – 2 19.50 23 0