The Constituency Commission has recommended increasing the number of TDs in the Dáil from 158 to 160, with some changes to constituencies around the country.
This would mean the next general election would be contested across 39 constituencies of which 13 will be five-seater constituencies, 17 will be four-seaters and nine will be three-seaters.
The commission examined the latest census information ahead of announcing its recommendations.
One of the new seats will be in Dublin Central which will return four TDs at the next election.
Cavan-Monaghan will have its Dáil representation boosted as it changes from a four-seat to a five-seat constituency.
Kildare-South will become a four-seater.
But there will still only be three seats up for grabs as it is the constituency of the Ceann Comhairle who is automatically returned.
At least one of the six TDs across the two constituencies of Laois and Offaly will lose out at the next election as those constituencies are to merge into a single five-seater one.
