Changes to Dáil constituencies will be announced this morning, along with the creation of up to 21 new TDs.
The Electoral Commission will deliver its report at 8am in one of the most significant re-drawings of election areas in the history of the State.
All the changes are based on population in order to meet the Constitutional requirement to have one TD for every 20,000 to 30,000 citizens.
It is expected there could be between four and six new seats in Dublin, with the Dublin-Fingal constituency to be carved up and the manner of that dictating the rest.
Cork is likely to get two extra TDs and Galway should get a further TD between one of the three constituencies the county is split over.
A number of rural five-seaters are likely to become two three-seat constituencies: including Tipperary, Donegal, Carlow/Kilkenny and Laois/Offaly.
There will be difficult decisions on areas like Wicklow and Wexford, where there should be one extra TD between the two constituencies and a significant redraw could happen.
Redraws of Louth and Meath East are likely, while Kildare North should get an extra TD as commuter belt counties see the highest population rises.