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.
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Irish National Teachers Organisation General Secretary John Boyle says it's not just commuter counties experiencing the problem.
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