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Trinity Comprehensive School

Trinity Comprehensive School is a secondary school in Dublin. 564 pupils, Catholic ethos, 3 special classes, 1.42 applicants per place last year, DEIS Post-primary.

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The facts

TypeSecondary school
GenderMixed
EthosCatholic
PatronMinister for Education
FeesFree
Enrolment564 (282 boys, 282 girls) 2025/26
Language of instructionEnglish Medium School
DEISYes — Post-primary
Roll number81017A
EircodeD09TN22
AddressBALLYMUN ROAD, DUBLIN 9

Getting in

Competitive. 136 applications for 96 places in 2026/27 — 1.42 applicants per place.

Places in the coming year96
Places last year96
Applications last year136
Waiting list0
Applications open01 October 2026
Applications close22 October 2026

Ratio calculated against the previous year's places, as stated in the notice.

read from the school's Annual Admission Notice.

Read the school's Annual Admission Notice ↗ (2027/28)

Ireland has no catchment areas. A place depends on the school's own oversubscription criteria — siblings, feeder school, parish, distance, date of application — not on where you live. Read the admissions policy for those.

What DEIS means here

DEIS Post-primary. This is extra staffing, a Home School Community Liaison coordinator, School Completion Programme access, enhanced capitation, free State exam fees, and eligibility for the HEAR Scheme for reduced-points college entry.

Post-primary DEIS benefits: Free State examination fees for Junior Cycle and Leaving Certificate, Home School Community Liaison (HSCL) coordinator, School Completion Programme, and eligibility for the HEAR Scheme (Higher Education Access Route) offering reserved university places at reduced CAO points across Irish universities.

Worth knowing: several things people associate with DEIS are now available in every school. Schoolbooks are free at primary and post-primary regardless of DEIS status, and since 2025 all primary schools are eligible for the hot school meals programme. What remains specific to DEIS is the staffing — reduced class sizes in Urban Band 1, the Home School Community Liaison coordinator, School Completion Programme access and enhanced capitation.

Band as published in the Department's DEIS list, last revised 2022-10-12.

What DEIS is, band by band, HEAR college entry, and whether it says anything about how good a school is →

Special classes

3 special classes sanctioned for 26/27:

2 of these are newly sanctioned for 26/27, up from 1 classes last year.

Source: National Council for Special Education. Children in a special class travel under a separate transport scheme with its own rules.

The area around this school

School planning area: Whitehall / Santry D9. This is how the Department plans where to build capacity. It is not a catchment.

Local house prices: the median residential sale price in Eircode district D09 (Dublin 9) was €492,000 in 2025. That is up 24.6% since 2020. CSO figures for the whole district, not the streets beside the school.

Area profile: the Pobal HP Deprivation Index rates Ballymun C at -15.85 (Disadvantaged), where 0 is the national average. 20% of adults there hold a third-level qualification.

Contact

PrincipalFrances Neary
Phone018428356
Emailinfo@trinitycomp.ie
Local authorityDublin City Council

Other schools in Whitehall / Santry D9

How we know

DoE Schools GIS 2026 (CC BY 4.0) — checked 2026-08-27.