Nearly 18,000 people have been on waiting lists for more than 18 months at hospitals that serve the Shannonside region.
A total of more than 109,000 people are awaiting inpatient or outpatient treatment at these hospitals.
The National Treatment Purchase Fund’s figures for the end of February show more and more people in Roscommon, Leitrim and Longford are waiting for inpatient or outpatient treatment.
Galway University Hospital has the longest combined lists of the seven Shannonside hospitals, at nearly 49,600.
Of those, 7,900 have been on them for more than 18 months.
The next longest lists are at Sligo University Hospital, where more than 17,640 are waiting for inpatient or outpatient care, with 2,111 waiting at least 18 months.
The situation is slightly better at Midland Regional Hospital in Tullamore, where there are 17,000 people waiting treatment, with more than 4,500 waiting at least a year and a half.
The situation at Midland Regional Hospital in Mullingar has worsened recently, with nearly 8,377 awaiting treatment, 1,446 of whom are waiting at least a year and a half.
Cavan General Hospital has 8,100 people awaiting treatment, with 775 waiting for at least 18 months.
Roscommon University Hospital has more than 4,202 people awaiting treatment, with 865 waiting at least a year and a half.
The other hospital that serves the Shannonside region is Portiuncula University Hospital in Ballinasloe, which has nearly 4,200 on its lists, but only 275 have been waiting at least 18 months.