Mount Sackville Secondary School
Mount Sackville Secondary School is a secondary school girls only in Dublin. 636 pupils, Catholic ethos, fee-paying, 1.34 applicants per place last year.
The facts
| Type | Secondary school |
|---|---|
| Gender | Girls only |
| Ethos | Catholic |
| Patron | Le Chéile Schools Trust |
| Fees | Fee-paying — amount not confirmed. This school does not publish a figure we could trace to a page. |
| Enrolment | 636 (0 boys, 636 girls) 2025/26 |
| Language of instruction | English Medium School |
| Roll number | 60120W |
| Eircode | D20WP68 |
| Address | Tower Road, Chapelizod, Dublin 20 |
Getting in
Competitive. 161 applications for 120 places — 1.34 applicants per place, and 61 names went on the waiting list.
| Places in the coming year | 120 |
|---|---|
| Places last year | 120 |
| Applications last year | 161 |
| Waiting list | 61 |
| Applications open | 03 October 2023 |
| Applications close | 20 October 2023 |
Ratio calculated against the previous year's places, as stated in the notice.
The school received 233 applications in total across every class and every special class. The 161 above is the figure for this intake alone, which is the one that can be compared with the places offered for it.
read from the school's Annual Admission Notice.
Read the school's Annual Admission Notice ↗ (2024/25)
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.
Special classes
The NCSE lists no special class at this school for the coming year.
The area around this school
School planning area: Castleknock / D15. 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 D20 (Dublin 20) was €440,000 in 2025. That is up 35.9% since 2020. CSO figures for the whole district, not the streets beside the school.
Area profile: the Pobal HP Deprivation Index rates Castleknock-knockmaroon at 10.69 (Affluent), where 0 is the national average. 64% of adults there hold a third-level qualification.
Contact
| Principal | Mrs Eileen Cuddihy Higgins |
|---|---|
| Phone | 018213317 |
| info@mountsackville.ie | |
| Local authority | Fingal County Council |
Other schools in Castleknock / D15
- Castleknock College Secondary school, Dublin
- Castleknock Educate Together Ns Primary school, Dublin
- Edmund Rice College Secondary school, Dublin
- Scoil Mhuire Primary school, Dublin
- Scoil Naisunta Chnuacha Primary school, Dublin
- St Brigids Mxd N S Primary school, Dublin
- St Michaels Spec School Special school, Dublin 20
How we know
DoE Schools GIS 2026 (CC BY 4.0) — checked 2026-08-27.