Renters in new tenancies are paying almost 1,700 euro a month, with Roscommon seeing some of the highest increases.
The latest update from the Residential Tenancies Board shows existing tenants paid about 1,450 euro a month in the first quarter of the year.
Eight counties recorded double digit percent increases over one year, including Donegal, Kerry, Kildare, Laois, Limerick, Monaghan, Roscommon and Tipperary.
However Dublin saw slower growth at just over three percent.
The number of registered private tenancies rose by just over three percent year on year in quarter two.
Notices of termination increased by 17 percent to 4,728.
