Sligo University Hospital was the third most overcrowded hospital in the country this month.
The IMNO says this month is the most overcrowded February on record for hospitals around the country.
More than 930 people were on trolleys this month in Sligo.
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University Hospital Limerick was the most overcrowded with just under 2,000 on trolleys, followed by University Hospital Galway with over 1,200.