There are 525 patients on trolleys in emergency departments, or on wards today, waiting for admission to a hospital bed.
The hospital worst affected is St Vincent's University Hospital in Dublin with 44 patients waiting.
Other hospitals badly affected are University Hospital Limerick with 40 patients and Our Lady of Lourdes Hospital, Drogheda with 39.
36 people are waiting for a bed in Beaumont Hospital which has asked people to stay away due to overcrowding.
The figures are compiled by the Irish Nurses and Midwives' Organisation.
However, the HSE has said its system recorded 263 patients on trolleys with 180 waiting over 9 hours.
It said that at 8am its TrolleyGar system recorded 420 patients on trolleys, with 212 waiting over 9 hours. The executive said the number of patients presenting to Emergency Departments continues to be at a higher level that last year.
The HSE said that despite a significant and sustained increase in attendees, the total year to date number of patients waiting on trolleys at 8am each morning shows a marginal increase of 1%.
It said that delayed patient discharges have also increased to 597, a key factor relating to challenges in securing appropriate long stay facilities and an increase in the number of patients with complex care needs.
The executive said that a significant number of hospitals are reporting increased incidences of norovirus and diarrhoea and vomiting and this is resulting in significant bed closures - around 60 beds.
The hospitals most affected are Sligo, Tallaght, Naas, Beaumont and Waterford.
The HSE said experience in other years has shown that typically after St Patrick's Day and Easter there are pressures in Emergency Departments following the Bank Holiday weekend periods.
It expects that the situation will stabilise over the coming days and that hospitals will continue to invoke the full escalation protocol.
2% decrease in number of patients on ED trolleys - Dept of Health
The Department of Health said there has been a 2% decrease in the total number of patients waiting on trolleys in Emergency Departments this year, in spite of a 7% increase in activity.
It said this reflects the €117 million to address overcrowding allocated by the last government since 2016.
The department said 358 extra hospital beds and 173 short stay nursing beds have been opened.
Also, an extra 750 additional nurses have been recruited and almost 80 additional consultants employed.
The department said that the problem remains serious, but delayed discharges from hospitals have fallen by 200 and the waiting time for the Fair Deal Scheme is now as low as three weeks.
Earlier, the IMNO said 9,381 patients spent time on trolleys in March waiting for admission to a hospital bed - a 5% increase on the same period last year.
It listed a number of hospitals, which have been particularly affected, including the Midland Regional Hospital, Tullamore, University Hospital Limerick and Cork University Hospital.
The INMO said the figures show that all of the actions required, and agreed, under the Emergency Department Taskforce have not been implemented.
INMO General Secretary Liam Doran said he is seeking an immediate meeting with the ED Implementation Group to assess the situation.
He said: "Notwithstanding this period of political inertia, nothing must get in the way of whatever special measures are necessary to lessen the current environment facing patients and frontline staff."
The Workplace Relations Commission is due to undertake its second review of the ED agreement between the INMO, the Health Service Executive and the Department of Health on Friday 15 April.
Separately, a consultant in emergency medicine at Sligo University Hospital has warned that the number of people on trolleys is rising now that the political focus has been moved elsewhere.
Speaking on RTÉ's Morning Ireland, Fergal Hickey described how ambulances queued up to bring patients into the department yesterday and patients were put on trolleys in corridors.
Mr Hickey said there had been a "brief improvement" while there was political focus on the crisis but the situation has deteriorated now there is no government.
