Below are lists of SDLP marginal seats showing which constituencies won in the latest elections can be most easily lost.
Below is the SDLP defence list consisting of SDLP held marginal seats for the 2025 general election. These marginal constituencies are ordered from the smallest to the largest swing to be defeated by the largest opposition party.
View SDLP target seats for the next general election.
(order by percentage majority)
| Rank | Constituency | Region | Majority | Swing to Defeat | |
|---|---|---|---|---|---|
| 1. | Belfast South | Northern Ireland | 15,401 | 16.26% | |
| 2. | Foyle | Northern Ireland | 17,110 | 18.15% |
View SDLP target seats for the next general election.
