The CSO compiled population projections for the 8 NUTS3 Regional Authority Areas classified by age and sex for the period 2017 - 2036. The further breakdown by area (e.g. Killester, Raheny and Clontarf ) is not available. The regional CSO projections data, based on 2016 Census results, is published here: https://www.cso.ie/en/releasesandpublications/ep/p-rpp/regionalpopulationprojections2017-2036/.
Additionally, Department compiled schools enrolment projections by NUTS3 regions, that are based on the CSO regional projections, and report/tables can be found here: https://www.gov.ie/en/collection/projections/.
For further information please contact by e-mail at Statistics@education.gov.ie