The Department of Health's Special Delivery Unit says it believes that around 365,000 patients are waiting to be seen at an outpatient clinic.
The first electronic data on this list came in today but definitive figures are not ready yet.
A report from the unit shows there are 415 adult patients waiting longer than nine months for inpatient treatment.
Earlier this year, Health Minister James Reilly asked the HSE to ensure no patient is waiting longer than nine months by this month.
The HSE's official target on this is year's end.
The figures show that 170 patients are waiting over a year for inpatient care at five hospitals, which means the target set in this area was also missed.
The SDU says that compared with last year, trolley waits have fallen by over 23% and inpatient and day case waiting lists are down by 16% to just under 50,000 patients.
The number of patients on trolleys in emergency units has increased in recent weeks, partly due to seasonal factors.
Two hospitals, the Mater and Our Lady of Lourdes in Drogheda, are highlighted as not showing big improvements in trolley waiting times.
Other figures today show that there are 241 patients on trolleys in emergency departments around the country.
The worst-affected hospital is Beaumont Hospital in Dublin with 25 patients in the emergency department, according to the Irish Nurses and Midwives Organisation.