Marginal constituencies are the contests in the election that are expected to be closest, based on the 2017 result. They are the most important seats to target for tactical voting, and wider campaigning for the party that can stop the Tories there.
|Constituency||Likely contest (2019)||Tactical vote||Margin (2017)||Distance|
|South Down||Sinn Fein vs||None||4.81%||23 miles|
|Belfast South||DUP vs||4.57%||33 miles|
|South Antrim||DUP vs UUP||Not sure||7.43%||35 miles|
|Belfast North||DUP vs Sinn Fein||Sinn Fein||4.53%||35 miles|
|Fermanagh and South Tyrone||Sinn Fein vs UUP||Sinn Fein||1.64%||37 miles|
|North Down||Unusual seat||Not sure||3.08%||44 miles|