Letterkenny University Hospital is now among 13 nationwide that have no ICU capacity left.
Among others are hospitals in Galway, Portlaoise, Navan and Naas, according to statistics from the HSE.
32 intensive care beds are available nationwide across both adult and pediatric units.
The latest available figures show that 1,846 people with Covid-19 are in hospitals this morning, which includes 171 in ICU.
HSE CEO Paul Reid says hospitals are still coping.
