Northern Ireland: New Constituency Boundaries 2023

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

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:

• Disappear : seats which have disappeared as they are broken into small fragments
• Switch Out : seats lost because their political make-up has altered
• Switch In : seats gained because their political make-up has altered
• Fresh : freshly created new seats which are made up of small fragments of old seats

Antrim

New seat	Primary component	Secondary component(s)
Antrim East	97.0% of Antrim East	8.9% of Antrim North 0.2% of Antrim South
Antrim North	91.1% of Antrim North	1.3% of Antrim East
Antrim South	97.2% of Antrim South	1.2% of Antrim East 1.0% of Belfast North 0.5% of Lagan Valley 0.1% of Belfast West
Belfast East	95.0% of Belfast East	10.0% of Belfast South
Belfast North	92.2% of Belfast North	4.0% of Belfast West 2.6% of Antrim South 0.5% of Antrim East
Belfast South and Mid Down	90.0% of Belfast South	8.9% of Strangford 3.5% of Lagan Valley 0.4% of Belfast West
Belfast West	95.5% of Belfast West	6.9% of Belfast North 4.9% of Lagan Valley 0.0% of Belfast South

Armagh

New seat	Primary component	Secondary component(s)
Upper Bann	88.5% of Upper Bann	4.3% of Newry and Armagh

Down

New seat	Primary component	Secondary component(s)
Down North	100% of Down North	5.0% of Belfast East
Down South	87.0% of Down South	2.6% of Upper Bann 0.9% of Newry and Armagh 0.2% of Lagan Valley
Lagan Valley	90.8% of Lagan Valley	8.9% of Upper Bann 0.0% of Down South
Newry and Armagh	90.0% of Newry and Armagh	1.6% of Down South
Strangford	91.1% of Strangford	11.3% of Down South

Fermanagh

New seat	Primary component	Secondary component(s)
Fermanagh and South Tyrone	96.3% of Fermanagh and South Tyrone	4.8% of Newry and Armagh 0.9% of Ulster Mid
Tyrone West	100% of Tyrone West	3.7% of Ulster Mid 2.4% of Foyle

Londonderry

New seat	Primary component	Secondary component(s)
Foyle	93.7% of Foyle
Londonderry East	100% of Londonderry East	3.9% of Foyle

Tyrone

New seat	Primary component	Secondary component(s)
Ulster Mid	95.5% of Ulster Mid	3.7% of Fermanagh and South Tyrone