New figures from the Irish Nurses and Midwives Organisation reveal Sligo Hospital was dealing with the second highest level of overcrowding in the country during the month of June.
A total of 822 patients were left without a bed at the facility over the last four weeks.
The local hospital has seen high numbers of patients waiting on trolleys or chairs in recent weeks with severe pressures on bed availability.
This month's figure shows a significant rise when compared to the same month in 2022 when 612 people were on trolleys.
INMO trolley figures go back to 2006 when just 27 patients were on trolleys in June of that year.
Nationally 8-thousand 312 patients, including 164 children, were admitted to hospital without a bed in June.
University Hospital Limerick was the worst affected by overcrowding this month.
