Pupils in Leitrim are being educated in the most overcrowded classrooms in the north west.
On average 59.5 % of pupils in the county are being thought in classes of 25 or more – well ahead of the EU norm of 20 and an average across the developing world of 21.
Donegal follows close behind with 58.8% of pupils in above average size classes while Sligo has 56% of pupils in a similar situation.
A new report shows nationally our class sizes are the second biggest in Europe at 24.3 pupils.
Irish National Teachers Organisation General Secretary John Boyle says it’s not just commuter counties experiencing the problem.