Northern Ireland: New Constituency Boundaries 2018

Each new seat can be described as a combination of parts of old seats. These tables show this decomposition. The winner of the old seat at the 2019 election is shown by party colour, as is the implied winner of the new seat.

The implied results are calculated using the local election results for the wards which make up each old seat. This should give the most accurate projection, since it reflects varying political behaviour across the seat.

Northern Ireland Change Table

PartyOld SeatsNew SeatsChangeDisappearSwitch OutSwitch InFresh

The table shows how the various changes affect each party in this area. The total old and new seats are shown for each party, as well as their difference ('Change'). The change in seats is also explained through the four explanations:

The old seats which are disappearing are: Antrim South.


New seatPrimary componentSecondary component(s)
Antrim East 91.7% of Antrim East 24.2% of Antrim South
Antrim Mid 72.9% of Antrim North 21.2% of Antrim South
0.7% of Antrim East
Belfast East 97.3% of Belfast East 9.6% of Down North
3.0% of Belfast South
Belfast North 92.2% of Belfast North 8.8% of Antrim South
6.2% of Antrim East
Belfast South 97.0% of Belfast South 4.4% of Strangford
3.5% of Lagan Valley
2.7% of Belfast East
0.2% of Belfast West
Belfast West 99.8% of Belfast West 8.1% of Lagan Valley
7.8% of Belfast North


New seatPrimary componentSecondary component(s)
Newry and Armagh 94.3% of Newry and Armagh 1.9% of Down South
0.8% of Fermanagh and South Tyrone
Upper Bann 82.0% of Upper Bann 4.5% of Newry and Armagh
0.6% of Fermanagh and South Tyrone
0.1% of Lagan Valley


New seatPrimary componentSecondary component(s)
Antrim South 62.8% of Lagan Valley 45.8% of Antrim South
Down Mid 69.9% of Strangford 25.3% of Lagan Valley
15.4% of Upper Bann
2.6% of Down South
Down North 90.4% of Down North 23.0% of Strangford
Down South 95.5% of Down South 2.5% of Upper Bann
2.7% of Strangford
1.2% of Newry and Armagh
0.2% of Lagan Valley


New seatPrimary componentSecondary component(s)
Fermanagh and South Tyrone 98.7% of Fermanagh and South Tyrone 2.4% of Ulster Mid


New seatPrimary componentSecondary component(s)
Causeway 78.4% of Londonderry East 27.1% of Antrim North
1.4% of Antrim East
Foyle 100% of Foyle 1.4% of Tyrone West
Sperrin 98.6% of Tyrone West 14.4% of Londonderry East
0.0% of Foyle


New seatPrimary componentSecondary component(s)
Ulster Mid 97.6% of Ulster Mid 7.1% of Londonderry East