In 2012, the Constituency Commission produced a report and left just 11 constituencies unchanged, Conor McMorrow of RTÉ's Political Staff reports.
The constituencies that remain unchanged for Election 2016 are: Carlow-Kilkenny (five seats), Clare (four seats), Longford-Westmeath (four seats), Cork East (four seats); Cork South West (three seats), Dublin Mid-West (four seats); Louth (five seats), Meath East (three seats), Meath West (three seats), Wexford (five seats) and Wicklow (five seats).
Here are the details of the changes to constituency boundaries:
Dublin
Dublin city consists of the five constituencies of Dublin Bay North (five seats), Dublin North-West (three), Dublin Central (three), Dublin South-Central (four) and Dublin Bay South (four).
Outside that, there are the six constituencies of Dublin Fingal (five seats) and Dublin West (four); Dublin Mid-West (four seats, unchanged) and Dublin South-West (five); Dublin Rathdown (three) and Dún Laoghaire (four).
The two three-seat constituencies of Dublin North Central and North East have amalgamated into one new large constituency - Dublin Bay North - that stretches from the edge of Drumcondra to the hill of Howth.
The old Dublin South-East has been expanded to take in a portion of Terenure and Kimmage and is now called Dublin Bay South.
The north inner city constituency of Dublin Central has been reduced to three from four seats after ceding territory to Dublin West and Dublin North-West. Dublin South Central has been reduced from a five to a four-seater.
Parts of Leopardstown, Carrickmines, Foxrock, Stillorgan and Cabinteely have moved from Dublin South into a newly expanded Dún Laoghaire.
Dublin South has been renamed Dublin Rathdown and it has been reduced from a five-seater to a three-seater.
Nine electoral divisions with a population of almost 40,000 - including areas such as Ballyboden, Firhouse, and Rathfarnham - have gone from Dublin South to Dublin South-West. The latter constituency has been expanded from four to five seats.
Dublin North has been renamed Dublin Fingal and it goes from a four to a five-seater.
This follows the transfer of a population of 17,291 people from areas around Swords into the constituency.
Rest of Leinster
The five-seat Laois-Offaly has been divided in two for this election.
Laois, with some population from Kildare, forms a three-seat constituency. Six electoral divisions, including Monasterevin and Churchtown, with a population of 7,186, have been transferred from Kildare South to the new Laois constituency.
Offaly, with some population from North West Tipperary, forms a three-seat constituency.
The rest of the county of Kildare forms a four-seat constituency (Kildare North) and a three-seat constituency (Kildare South).
Munster
Cork, including Cork city, consists of the five constituencies of Cork East (four seats, unchanged), Cork North-Central (four), Cork North-West (three), Cork South-Central (four) and Cork South-West (three seats, unchanged).
Four electoral divisions, with a population of 5,048, have been transferred from Cork North-Central to Cork North-West.
Eleven electoral divisions, with a population of 17,307, have been transferred from Cork South-Central to Cork North-Central. Cork South-Central loses a seat to become a four-seater.
Kerry is now one five-seat constituency where the three-seat Kerry North and Kerry South have joined.
Limerick is made up of a four-seat Limerick City constituency and a three-seat constituency called Limerick County. Waterford, including Waterford city, is a four-seat constituency.
Twenty-four electoral divisions in North West Tipperary (with a population of 10,953) - taking in areas such as Terryglass, Cloughjordan and Borrisokane - have moved to Offaly.
The rest of Tipperary forms a new five-seat constituency joining up the Tipperary North and Tipperary South three-seat constituencies.
Connacht and Ulster
Sligo and Leitrim, with nine electoral divisions from south Donegal (including Bundoran and Ballyshannon) and 36 electoral divisions from west Cavan (including Dowra, Ballyconnell and Killeshandra), form the four-seat Sligo-Leitrim constituency.
The rest of Donegal is a new five-seat constituency, which sees the two three-seat Donegal South-West and Donegal North-East amalgamated. The rest of Cavan and all of Monaghan is now a four-seat constituency.
Galway West, with 10,306 people in the Ballinrobe area of south Mayo, remains a five-seat constituency. The rest of Mayo forms a four-seat constituency, which is down one seat from 2011.
Roscommon, with 20,521 people from east Galway (including Glenamaddy, Ballinasloe, and Dunmore), forms a three-seat constituency called Roscommon-Galway. The rest of the Galway East constituency forms a three-seat constituency.
